v3.23.2
Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents $ 404.7 $ 182.4
Short-term investments 150.6 127.7
Prepaid expenses and other current assets 68.8 57.8
Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 231.2 159.8
Money market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 173.5 18.6
Securities guaranteed by U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents   4.0
Level 1 | Measured on a recurring basis | Interest rate cap contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets 0.0 0.0
Deferred costs and other assets, net of current portion   0.0
Level 1 | Measured on a recurring basis | Interest rate swap contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets 0.0 0.0
Deferred costs and other assets, net of current portion 0.0 0.0
Level 1 | Measured on a recurring basis | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 0.0 0.0
Short-term investments 0.0 0.0
Level 1 | Measured on a recurring basis | Money market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 173.5 18.6
Level 1 | Measured on a recurring basis | Securities guaranteed by U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents   0.0
Short-term investments 0.0 0.0
Level 1 | Measured on a recurring basis | Other governmental securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0.0 0.0
Level 2 | Measured on a recurring basis | Interest rate cap contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets 1.4 1.2
Deferred costs and other assets, net of current portion   0.3
Level 2 | Measured on a recurring basis | Interest rate swap contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets 23.7 21.5
Deferred costs and other assets, net of current portion 26.0 30.3
Level 2 | Measured on a recurring basis | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 231.2 159.8
Short-term investments 99.9 91.7
Level 2 | Measured on a recurring basis | Money market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 0.0 0.0
Level 2 | Measured on a recurring basis | Securities guaranteed by U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents   4.0
Short-term investments 28.5 25.0
Level 2 | Measured on a recurring basis | Other governmental securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 22.2 11.0
Level 3 | Measured on a recurring basis | Interest rate cap contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets 0.0 0.0
Deferred costs and other assets, net of current portion   0.0
Level 3 | Measured on a recurring basis | Interest rate swap contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets 0.0 0.0
Deferred costs and other assets, net of current portion 0.0 0.0
Level 3 | Measured on a recurring basis | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 0.0 0.0
Short-term investments 0.0 0.0
Level 3 | Measured on a recurring basis | Money market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 0.0 0.0
Level 3 | Measured on a recurring basis | Securities guaranteed by U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents   0.0
Short-term investments 0.0 0.0
Level 3 | Measured on a recurring basis | Other governmental securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0.0 $ 0.0
Secured Debt | First Lien Term Loan | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instrument fair value 596.3  
Senior Notes | Senior Notes | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instrument fair value $ 552.5