Goodwill and Other Intangibles - Other Intangible Assets and Capitalized Software (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 206.4	$ 221.3
Less: Accumulated Amortization	114.8	108.7
Net Book Value	91.6	112.6
Computer Software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,982.1	4,337.4
Less: Accumulated Amortization	1,299.5	2,744.5
Net Book Value	$ 1,682.6	$ 1,592.9