Goodwill and Other Intangibles (Other Intangible Assets and Capitalized Software) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 203.3	$ 206.4
Less: Accumulated Amortization	116.1	114.8
Net Book Value	87.2	91.6
Computer Software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,111.7	2,982.1
Less: Accumulated Amortization	1,400.7	1,299.5
Net Book Value	$ 1,711.0	$ 1,682.6