Derivatives (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value Of Derivatives [Abstract]
Derivative Asset, Fair Value	$ 224.2	$ 96.8
Derivative Liability, Fair Value	179.0	86.1
Designated hedges [Member]
Fair Value Of Derivatives [Abstract]
Derivative Asset, Fair Value	37.0	23.9
Derivative Liability, Fair Value	13.0	17.6
Designated hedges [Member] | Other Assets [Member] | Interest rate fair value hedges - Corporate [Member]
Fair Value Of Derivatives [Abstract]
Derivative Asset, Fair Value	12.3	13.1
Designated hedges [Member] | Other Assets [Member] | Foreign currency contracts [Member] | Consumer-to-Consumer [Member]
Fair Value Of Derivatives [Abstract]
Derivative Asset, Fair Value	24.7	10.8
Designated hedges [Member] | Other Liabilities [Member] | Interest rate fair value hedges - Corporate [Member]
Fair Value Of Derivatives [Abstract]
Derivative Liability, Fair Value	6.0	0
Designated hedges [Member] | Other Liabilities [Member] | Foreign currency contracts [Member] | Consumer-to-Consumer [Member]
Fair Value Of Derivatives [Abstract]
Derivative Liability, Fair Value	7.0	17.6
Undesignated hedges [Member]
Fair Value Of Derivatives [Abstract]
Derivative Asset, Fair Value	187.2	72.9
Derivative Liability, Fair Value	166.0	68.5
Undesignated hedges [Member] | Other Assets [Member] | Foreign currency contracts [Member] | Business Solutions [Member]
Fair Value Of Derivatives [Abstract]
Derivative Asset, Fair Value	183.0	71.9
Undesignated hedges [Member] | Other Assets [Member] | Foreign currency contracts [Member] | Consumer-to-Consumer [Member]
Fair Value Of Derivatives [Abstract]
Derivative Asset, Fair Value	4.2	1.0
Undesignated hedges [Member] | Other Liabilities [Member] | Foreign currency contracts [Member] | Business Solutions [Member]
Fair Value Of Derivatives [Abstract]
Derivative Liability, Fair Value	165.2	66.5
Undesignated hedges [Member] | Other Liabilities [Member] | Foreign currency contracts [Member] | Consumer-to-Consumer [Member]
Fair Value Of Derivatives [Abstract]
Derivative Liability, Fair Value	$ 0.8	$ 2.0