Derivative Financial Instruments and Hedging Activities Schedule of Fair Value by Balance Sheet Location (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 82.3	$ 109.5
Cash collateral	8.1	9.6
Derivative asset, fair value, gross, net of cash collateral	74.2	99.9
Gross Amounts of Recognized Liabilities	82.2	112.9
Cash collateral	40.8	73.1
Derivative liabilities, fair value, gross, net of cash collateral	41.4	39.8
Foreign exchange contracts	40.1	68.8
Derivative assets, net	32.0	59.2
Foreign exchange contracts	40.0	72.1
Derivative liabilities, net	$ (0.8)	$ (1.0)