Debt - Debt and Average Interest Rates on Debt Outstanding (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Current maturities of short-term borrowings	$ 0.0	$ 9.3
Unamortized debt issuance costs and discounts	(14.9)	(15.1)
Total debt	1,580.1	1,648.0
Long-term debt	$ 1,580.1	1,638.7
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Average interest rate as of September 30, 2025	5.268%
Debt, gross	$ 220.0	9.5
Term Loans | 5-year Term Loan Facility
Debt Instrument [Line Items]
Average interest rate as of September 30, 2025	5.502%
Debt, gross	$ 575.0	825.0
Senior Notes | Senior Notes 4.650% Due 2025
Debt Instrument [Line Items]
Debt, gross	$ 0.0	19.3
Senior Notes | Senior Notes 4.500% Due 2029
Debt Instrument [Line Items]
Average interest rate as of September 30, 2025	4.50%
Debt, gross	$ 400.0	400.0
Senior Notes | Senior Notes 5.900%
Debt Instrument [Line Items]
Average interest rate as of September 30, 2025	5.90%
Debt, gross	$ 400.0	$ 400.0