Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Offsetting Assets and liabilities [Line Items]
Asset Fair Value	$ 658.1	$ 450.3
Liability Fair Value	261.1	114.4
Counterparty netting, Assets	(210.2)	(111.7)
Counterparty netting, Liabilities	(210.2)	(111.7)
Cash collateral netting, Assets	(407.0)	(298.0)
Cash collateral netting, Liabilities	(41.4)	(0.3)
Securities collateral netting, Assets	(12.0)	(11.0)
Securities collateral netting, Liabilities	(7.7)	(2.4)
Net receivables	28.9	29.6
Net payables	1.8	0.0
Interest rate contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	22,925.1	22,965.5
Asset Fair Value	637.8	422.4
Liability Fair Value	251.3	103.4
Foreign exchange contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	196.6	195.8
Asset Fair Value	15.6	24.6
Liability Fair Value	9.5	10.7
Equity contract
Offsetting Assets and liabilities [Line Items]
Notional Amount	92.5
Asset Fair Value	2.1
Liability Fair Value	0.0
Credit contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	407.5	407.5
Asset Fair Value	2.6	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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-Publisher FASB
-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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