Debt - Debt Outstanding and Average Interest Rates (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Jun. 30, 2022
Debt Instrument [Line Items]
Current maturities of short-term borrowings	$ 0.0	$ 9.3
Unamortized debt issuance costs and discounts	(14.1)	(15.1)
Total debt	1,638.6	1,648.0
Long-term debt	$ 1,638.6	1,638.7
Line of Credit | Revolving credit facility (Senior Credit Facility)
Debt Instrument [Line Items]
Average interest rate at end of period	4.852%
Debt, gross	$ 277.7	9.5
Term loans (Senior Credit Facility) | 5-year Term Loan Facility
Debt Instrument [Line Items]
Average interest rate at end of period	5.114%
Debt, gross	$ 575.0	825.0	$ 1,000.0
Senior Notes | Senior Notes, 4.650% due in 2025
Debt Instrument [Line Items]
Debt, gross	$ 0.0	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