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Debt - Debt and Average Interest Rates on Debt Outstanding (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2022
Debt Instrument [Line Items]
Short-Term Debt	$ (3.3)	$ 0.0
Unamortized debt issuance costs and discounts	(16.7)	(18.5)
Debt	1,755.9	1,988.3
Total debt	$ 1,752.6	1,988.3
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Average interest rate as of June 30, 2024	6.637%
Debt, gross	$ 0.0	0.0
Term Loans \| 5-year Term Loan Facility
Debt Instrument [Line Items]
Average interest rate as of June 30, 2024	6.802%
Debt, gross	$ 950.0	987.5	$ 1,000.0
Term Loans \| Term Loans, 1.033% Due 2024
Debt Instrument [Line Items]
Debt, gross	$ 0.0	200.0
Senior Notes \| Senior Notes 4.650% Due 2025
Debt Instrument [Line Items]
Average interest rate as of June 30, 2024	4.65%
Debt, gross	$ 19.3	19.3
Senior Notes \| Senior Notes 4.500% Due 2029
Debt Instrument [Line Items]
Average interest rate as of June 30, 2024	4.50%
Debt, gross	$ 400.0	400.0
Senior Notes \| Senior Notes 5.900%
Debt Instrument [Line Items]
Average interest rate as of June 30, 2024	5.90%
Debt, gross	$ 400.0	$ 400.0