Debt - Debt and Average Interest Rates on Debt Outstanding (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jul. 31, 2022	Jun. 30, 2022	Mar. 24, 2022
Debt Instrument [Line Items]
Debt, gross	$ 2,013.1
Unamortized debt issuance costs and discounts	(19.5)	$ (22.0)
Total debt	1,993.6	2,317.3
Line of Credit | Term Loans Due 2024
Debt Instrument [Line Items]
Debt, gross	$ 200.0
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Average interest rate as of September 30, 2023	6.619%
Debt, gross	$ 0.0	320.0
Term Loans | 5-year Term Loan Facility
Debt Instrument [Line Items]
Average interest rate as of September 30, 2023	6.809%
Debt, gross		1,000.0	$ 993.8		$ 1,000.0	$ 600.0
Term Loans | Term Loans, 1.033% due in 2024
Debt Instrument [Line Items]
Average interest rate as of September 30, 2023	6.634%
Debt, gross		200.0	200.0
Senior Notes | Senior Notes 4.650% Due 2025
Debt Instrument [Line Items]
Average interest rate as of September 30, 2023	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 September 30, 2023	4.50%
Debt, gross	$ 400.0	400.0
Senior Notes | Senior Notes Five Point Nine Percent Due Twenty Thirty Two
Debt Instrument [Line Items]
Average interest rate as of September 30, 2023	5.90%			5.90%
Debt, gross		$ 400.0	$ 400.0	$ 400.0