Debt - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Apr. 30, 2023	Sep. 30, 2021	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Long-term debt, gross					$ 1,568.2
Leverage ratio					4.25
Minimum
Debt Instrument [Line Items]
Leverage ratio					3.00
Maximum
Debt Instrument [Line Items]
Leverage ratio					3.75
Senior Notes | Senior Credit Facilities | Minimum
Debt Instrument [Line Items]
Consolidated unrestricted cash					$ 5.0
Senior Notes | Senior Credit Facilities | Maximum
Debt Instrument [Line Items]
Consolidated unrestricted cash					250.0
Senior Notes | Senior Notes 4.550% Due 2028
Debt Instrument [Line Items]
Face amount					$ 500.0
Average interest rate					4.55%
Long-term debt, gross					$ 500.0	$ 500.0
Senior Notes | Senior Notes 2.750% Due 2031
Debt Instrument [Line Items]
Average interest rate					2.75%
Long-term debt, gross					$ 300.0	300.0
Senior Notes | Senior Notes 5.650% Due 2033
Debt Instrument [Line Items]
Average interest rate					5.65%
Long-term debt, gross					$ 500.0	500.0
Line of Credit | Senior Notes
Debt Instrument [Line Items]
Debt term	5 years			5 years
Maximum borrowing capacity	$ 275.0			$ 300.0
Line of Credit | Senior Notes | 2023 Term loan facility
Debt Instrument [Line Items]
Long-term debt, gross			$ 300.0		0.0	277.5
Debt term			5 years
Line of Credit | Senior Notes | 2024 Term Loan Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 500.0				0.0	500.0
Debt term		2 years
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross					0.0	$ 0.0
Revolving Credit Facility | Senior Notes
Debt Instrument [Line Items]
Debt term	5 years			5 years
Maximum borrowing capacity				$ 600.0
Increase limit	$ 300.0
Remaining borrowing capacity					$ 600.0