Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Offsetting Assets and liabilities [Line Items]
Asset Fair Value	$ 657.3	$ 562.0
Liability Fair Value	298.7	216.9
Counterparty netting, Assets	(294.0)	(216.2)
Counterparty netting, Liabilities	(294.0)	(216.2)
Cash collateral netting, Assets	(304.7)	(291.5)
Cash collateral netting, Liabilities	0	0
Securities collateral netting, Assets	(6.5)	(6.6)
Securities collateral netting, Liabilities	(4.1)	0
Net receivables	52.1	47.7
Net payables	0.6	0.7
Credit contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	384.0	384.0
Asset Fair Value	6.0	6.5
Liability Fair Value	0	0
Foreign exchange contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	181.3	181.3
Asset Fair Value	26.0	18.3
Liability Fair Value	10.9	7.7
Interest rate contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	25,762.2	28,146.2
Asset Fair Value	625.3	537.2
Liability Fair Value	$ 287.8	$ 209.2

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (b)

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226016-175313

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Amount of obligation to return securities collateral under master netting arrangements that have not been offset against derivative assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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