Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Offsetting Assets and liabilities [Line Items]
Asset Fair Value	$ 659.0	$ 450.3
Liability Fair Value	274.7	114.4
Counterparty netting, Assets	(263.2)	(111.7)
Counterparty netting, Liabilities	(263.2)	(111.7)
Cash collateral netting, Assets	(361.0)	(298.0)
Cash collateral netting, Liabilities	(3.4)	(0.3)
Securities collateral netting, Assets	(11.3)	(11.0)
Securities collateral netting, Liabilities	(6.9)	(2.4)
Net receivables	23.5	29.6
Net payables	1.2	0.0
Interest rate contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	26,192.1	22,965.5
Asset Fair Value	636.2	422.4
Liability Fair Value	265.7	103.4
Foreign exchange contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	197.2	195.8
Asset Fair Value	18.1	24.6
Liability Fair Value	8.7	10.7
Equity contract
Offsetting Assets and liabilities [Line Items]
Notional Amount	99.0
Asset Fair Value	1.6
Liability Fair Value	0.0
Credit contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	407.5	407.5
Asset Fair Value	3.1	3.3
Liability Fair Value	$ 0.3	$ 0.3

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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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
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[Line Items] for Offsetting Assets and Liabilities [Table]

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