Goodwill and Other Intangibles - Other Intangible Assets Subject to Amortization and Capitalized Software (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]
Gross Carrying Amount	$ 127.0	$ 135.0
Less: Accumulated Amortization	68.9	63.4
Net Book Value	58.1	71.6	$ 77.6
Finite-Lived Intangible Assets [Roll Forward]
Balance	71.6	77.6
Amortization	(9.2)	(9.3)
Foreign Exchange Rates	(4.3)	3.3
Balance	58.1	71.6	77.6
Computer Software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,259.6	3,781.7
Less: Accumulated Amortization	2,104.5	1,754.2
Net Book Value	2,155.1	2,027.5
Finite-Lived Intangible Assets [Roll Forward]
Balance	2,027.5
Amortization	(597.6)	(509.4)	$ (434.2)
Balance	$ 2,155.1	$ 2,027.5