Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Offsetting Assets and Liabilities [Line Items]
Derivatives, Asset Fair Value	$ 1,714.9	$ 1,147.3
Derivatives, Liability Fair Value	841.1	1,330.9
Counterparty netting, Assets	(721.3)	(701.0)
Counterparty netting, Liabilities	(721.3)	(701.0)
Cash collateral netting, Assets	(661.1)	(241.7)
Cash collateral netting, Liabilities	(35.9)	(15.7)
Securities collateral netting, Assets	(158.9)	(35.9)
Securities collateral netting, Liabilities	(46.9)	(479.1)
Net receivables/payables, Assets	173.6	168.7
Net receivables/payables, Liabilities	37.0	135.1
Credit contracts
Offsetting Assets and Liabilities [Line Items]
Derivative, Notional Amount	4,221.0	3,221.0
Derivatives, Asset Fair Value	40.9	40.5
Derivatives, Liability Fair Value	36.0	14.5
Equity contracts
Offsetting Assets and Liabilities [Line Items]
Derivative, Notional Amount	13,576.1	4,513.5
Derivatives, Asset Fair Value	378.4	170.7
Derivatives, Liability Fair Value	201.7	32.0
Foreign exchange contracts
Offsetting Assets and Liabilities [Line Items]
Derivative, Notional Amount	1,547.8	1,456.4
Derivatives, Asset Fair Value	70.6	24.1
Derivatives, Liability Fair Value	26.8	44.9
Interest rate contracts
Offsetting Assets and Liabilities [Line Items]
Derivative, Notional Amount	67,776.4	64,734.1
Derivatives, Asset Fair Value	1,225.0	912.0
Derivatives, Liability Fair Value	$ 576.6	$ 1,239.5

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.

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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

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-Section 50

-Paragraph 3

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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

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-Section 55

-Paragraph 13

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

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