Goodwill and Other Intangibles - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 9.2	$ 9.3
Estimated future amortization expense year one	8.4
Estimated future amortization expense year two	8.0
Estimated future amortization expense year three	7.8
Estimated future amortization expense year four	7.2
Estimated future amortization expense year five	7.2
Computer Software
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 597.6	$ 509.4	$ 434.2