Derivative Financial Instruments and Hedging Activities Schedule of Fair Value by Balance Sheet Location (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Gross	$ 99.9	$ 109.5
Cash collateral	7.1	9.6
Derivative asset, fair value, gross, net of cash collateral	92.8	99.9
Gross Liabilities	99.9	112.9
Cash collateral	13.5	73.1
Derivative liabilities, fair value, gross, net of cash collateral	86.4	39.8
Foreign exchange derivative contracts	50.9	68.8
Derivative assets, net	43.8	59.2
Foreign exchange derivative contracts	50.9	72.1
Derivative liabilities, net	$ 37.4	$ (1.0)