Derivatives - Fair Value of Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Fair Value of Derivatives
Derivative Assets	$ 401.2	$ 204.5
Derivative Liabilities	323.5	159.5
Designated as hedges
Fair Value of Derivatives
Derivative Assets	37.0	21.0
Derivative Liabilities	0.2	4.8
Designated as hedges | Other assets | Foreign currency contracts
Fair Value of Derivatives
Derivative Assets	37.0	21.0
Designated as hedges | Other liabilities | Foreign currency contracts
Fair Value of Derivatives
Derivative Liabilities	0.2	4.8
Not designated as hedges
Fair Value of Derivatives
Derivative Assets	364.2	183.5
Derivative Liabilities	323.3	154.7
Not designated as hedges | Other assets | Foreign currency contracts
Fair Value of Derivatives
Derivative Assets	1.7	1.5
Not designated as hedges | Other liabilities | Foreign currency contracts
Fair Value of Derivatives
Derivative Liabilities	5.8	3.7
Not designated as hedges | Business Solutions | Other assets | Foreign currency contracts
Fair Value of Derivatives
Derivative Assets	362.5	182.0
Not designated as hedges | Business Solutions | Other liabilities | Foreign currency contracts
Fair Value of Derivatives
Derivative Liabilities	$ 317.5	$ 151.0