Derivatives - Fair Value of Derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value of Derivatives
Derivative Assets	$ 266.5	$ 204.5
Derivative Liabilities	206.3	159.5
Designated as hedges
Fair Value of Derivatives
Derivative Assets	17.7	21.0
Derivative Liabilities	1.3	4.8
Designated as hedges | Other assets | Foreign currency contracts
Fair Value of Derivatives
Derivative Assets	17.7	21.0
Designated as hedges | Other liabilities | Foreign currency contracts
Fair Value of Derivatives
Derivative Liabilities	1.3	4.8
Not designated as hedges
Fair Value of Derivatives
Derivative Assets	248.8	183.5
Derivative Liabilities	205.0	154.7
Not designated as hedges | Other assets | Foreign currency contracts
Fair Value of Derivatives
Derivative Assets	3.0	1.5
Not designated as hedges | Other liabilities | Foreign currency contracts
Fair Value of Derivatives
Derivative Liabilities	2.1	3.7
Not designated as hedges | Business Solutions | Other assets | Foreign currency contracts
Fair Value of Derivatives
Derivative Assets	245.8	182.0
Not designated as hedges | Business Solutions | Other liabilities | Foreign currency contracts
Fair Value of Derivatives
Derivative Liabilities	$ 202.9	$ 151.0