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Debt - Debt Outstanding and Average Interest Rates (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2023
Debt Instrument [Line Items]
Short term debt, average interest rate at end of period	5.533%
Current maturities of short-term borrowings	$ 9.3	$ 0.0
Unamortized debt issuance costs and discounts	(15.1)	(18.5)
Total debt	1,648.0	1,988.3
Long-term debt	$ 1,638.7	1,988.3
Line of Credit \| Revolving credit facility (Senior Credit Facility)
Debt Instrument [Line Items]
Average interest rate at end of period	5.533%
Debt, gross	$ 9.5	0.0
Term loans (Senior Credit Facility) \| 5-year Term Loan Facility
Debt Instrument [Line Items]
Average interest rate at end of period	5.85%
Debt, gross	$ 825.0	987.5	$ 1,000.0
Term loans (Senior Credit Facility) \| Term Loans, 1.224% due in 2024
Debt Instrument [Line Items]
Debt, gross	$ 0.0	200.0
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%
Debt, gross	$ 400.0	$ 400.0