v3.25.4
Debt and Finance Lease Obligations - Schedule of C&W Notes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Outstanding principal amount $ 8,349.8 $ 8,138.8
Carrying value $ 8,270.5 8,075.6
2032 C&W Senior Secured Notes | Senior Notes    
Debt Instrument [Line Items]    
Interest rate 7.125%  
Outstanding principal amount $ 1,000.0  
Carrying value $ 990.4  
Issued at 100.00%  
Interest rate 0.50%  
Debt instrument, periodic payment, percentage of principal 10.00%  
Debt instrument, redemption price, percentage available for redemption 40.00%  
Debt instrument, redemption price, percentage, one 103.00%  
Debt instrument, redemption price, percentage, two 107.125%  
2032 C&W Senior Secured Notes | Senior Notes | 2027    
Debt Instrument [Line Items]    
Issued at 103.563%  
2032 C&W Senior Secured Notes | Senior Notes | 2028    
Debt Instrument [Line Items]    
Issued at 101.781%  
2032 C&W Senior Secured Notes | Senior Notes | 2029    
Debt Instrument [Line Items]    
Issued at 100.00%  
2032 C&W Senior Secured Notes | Senior Notes | 2030 and thereafter    
Debt Instrument [Line Items]    
Issued at 100.00%  
C&W Senior Notes Due 2033 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate 9.00%  
Outstanding principal amount $ 755.0  
Carrying value $ 746.6  
Issued at 100.00%  
Interest rate 0.50%  
Debt instrument, redemption price, percentage available for redemption 40.00%  
Debt instrument, redemption price, percentage 109.00%  
C&W Senior Notes Due 2033 | Senior Notes | 2028    
Debt Instrument [Line Items]    
Issued at 104.50%  
C&W Senior Notes Due 2033 | Senior Notes | 2029    
Debt Instrument [Line Items]    
Issued at 102.025%  
C&W Senior Notes Due 2033 | Senior Notes | 2030 and thereafter    
Debt Instrument [Line Items]    
Issued at 100.00%  
C&W Notes | Senior Notes    
Debt Instrument [Line Items]    
Outstanding principal amount $ 1,755.0 $ 1,735.0
Carrying value $ 1,737.0