Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Offsetting Assets and liabilities [Line Items]
Asset Fair Value	$ 167.6	$ 470.8
Liability Fair Value	51.9	172.3
Counterparty netting, Assets	(47.5)	(169.0)
Counterparty netting, Liabilities	(47.5)	(169.0)
Cash collateral netting, Assets	(107.4)	(265.8)
Cash collateral netting, Liabilities	0.0	0.0
Securities collateral netting, Assets	(9.2)	(11.0)
Securities collateral netting, Liabilities	(3.3)	(1.7)
Net receivables	3.5	25.0
Net payables	1.1	1.6
Credit contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	846.7	425.5
Asset Fair Value	8.8	5.6
Liability Fair Value	6.4	0.2
Equity contract
Offsetting Assets and liabilities [Line Items]
Notional Amount	125.5	89.4
Asset Fair Value	3.9	2.3
Liability Fair Value	1.5	0.0
Foreign exchange contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	512.7	405.9
Asset Fair Value	6.8	25.4
Liability Fair Value	19.3	18.3
Interest rate contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	23,546.9	25,606.7
Asset Fair Value	148.1	437.5
Liability Fair Value	$ 24.7	$ 153.8

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
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[Line Items] for Offsetting Assets and Liabilities [Table]

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