Debt - Schedule of Debt Obligations (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total debt excluding financing lease liabilities	$ 1,225.0
Financing lease liabilities	6.9	$ 7.3
Total debt	1,231.9	1,226.6
Less unamortized discount on Term Debt	13.9	8.9
Less current portion of long-term debt	7.3	7.6
Long-term debt, less current portion	1,210.7	1,210.1
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Total debt excluding financing lease liabilities	575.0	575.0
2018 Term Debt [Member]
Debt Instrument [Line Items]
Total debt excluding financing lease liabilities		$ 644.3
2024 Term Debt [Member]
Debt Instrument [Line Items]
Total debt excluding financing lease liabilities	$ 650.0

Debt instrument carrying amount and finance lease liability.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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