Derivatives - Schedule of Fair Value of Derivatives (Details) - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Fair Value of Derivatives [Abstract]
Derivative Assets		$ 428.9	$ 396.3
Derivative Liabilities		339.2	283.7
Designated as hedges
Fair Value of Derivatives [Abstract]
Derivative Assets		56.4	67.3
Derivative Liabilities		8.7	2.4
Designated as hedges | Other Assets | Interest rate fair value hedges
Fair Value of Derivatives [Abstract]
Derivative Assets		19.6	7.6
Designated as hedges | Other Assets | Foreign currency contracts
Fair Value of Derivatives [Abstract]
Derivative Assets		36.8	59.7
Designated as hedges | Other Liabilities | Interest rate fair value hedges
Fair Value of Derivatives [Abstract]
Derivative Liabilities		0.2	0.0
Designated as hedges | Other Liabilities | Foreign currency contracts
Fair Value of Derivatives [Abstract]
Derivative Liabilities		8.5	2.4
Undesignated hedges
Fair Value of Derivatives [Abstract]
Derivative Assets		372.5	329.0
Derivative Liabilities		330.5	281.3
Undesignated hedges | Other Assets | Foreign currency contracts
Fair Value of Derivatives [Abstract]
Derivative Assets		4.3	2.9
Undesignated hedges | Other Liabilities | Foreign currency contracts
Fair Value of Derivatives [Abstract]
Derivative Liabilities		4.7	4.2
Undesignated hedges | Business Solutions | Other Assets | Foreign currency contracts
Fair Value of Derivatives [Abstract]
Derivative Assets	[1]	368.2	326.1
Undesignated hedges | Business Solutions | Other Liabilities | Foreign currency contracts
Fair Value of Derivatives [Abstract]
Derivative Liabilities	[1]	$ 325.8	$ 277.1

[1] In many circumstances, the Company allows its Business Solutions customers to settle part or all of their derivative contracts prior to maturity. However, the offsetting positions originally entered into with financial institution counterparties do not allow for similar settlement. To mitigate this, additional foreign currency contracts are entered into with financial institution counterparties to offset the original economic hedge contracts. This frequently results in increases in the Company's derivative assets and liabilities that may exceed the growth in the underlying derivatives business.