Derivative Financial Instruments and Hedging Activities Schedule of Fair Value by Balance Sheet Location (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Gross Assets	$ 96.9	$ 109.5
Cash collateral	6.1	9.6
Derivative asset, fair value, gross, net of cash collateral	90.8	99.9
Gross Liabilities	96.0	112.9
Cash collateral	7.1	73.1
Derivative liabilities, fair value, gross, net of cash collateral	88.9	39.8
Foreign exchange derivative contracts	44.5	68.8
Derivative assets, net	38.4	59.2
Foreign exchange derivative contracts	43.6	72.1
Derivative liabilities, net	$ 36.5	$ (1.0)