Goodwill and Other Intangibles (Other Intangible Assets and Capitalized Software) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 128.7	$ 197.9
Less: Accumulated Amortization	58.4	120.3
Net Book Value	70.3	77.6
Computer Software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,896.1	3,479.3
Less: Accumulated Amortization	1,881.6	1,517.4
Net Book Value	$ 2,014.5	$ 1,961.9