Debt - Debt Outstanding and Average Interest Rates (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Jul. 31, 2022	Jun. 30, 2022
Debt Instrument [Line Items]
Debt, gross	$ 2,006.8
Unamortized debt issuance costs and discounts	(18.5)	$ (22.0)
Total debt	$ 1,988.3	2,317.3
Line of Credit | Revolving credit facility (Senior Credit Facility)
Debt Instrument [Line Items]
Average interest rate at end of period	6.655%
Debt, gross	$ 0.0	320.0
Term loans (Senior Credit Facility) | Term Loans, 1.224% due in 2023
Debt Instrument [Line Items]
Average interest rate at end of period	6.61%
Debt, gross	$ 200.0	200.0
Term loans (Senior Credit Facility) | 5-year Term Loan Facility
Debt Instrument [Line Items]
Average interest rate at end of period	6.891%
Debt, gross	$ 987.5	1,000.0		$ 1,000.0
Senior Notes | Senior Notes, 4.650% due in 2025
Debt Instrument [Line Items]
Average interest rate at end of period	4.65%
Debt, gross	$ 19.3	19.3
Senior Notes | Senior Notes, 4.500% due in 2029
Debt Instrument [Line Items]
Average interest rate at end of period	4.50%
Debt, gross	$ 400.0	400.0
Senior Notes | 5.900% Senior Notes
Debt Instrument [Line Items]
Average interest rate at end of period	5.90%		5.90%
Debt, gross	$ 400.0	$ 400.0	$ 400.0