Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	$ 148.6	$ 488.3
Derivatives, Liability Fair Value	192.6	303.2
Credit contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	834.7	425.5
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	21,703.9	25,606.7
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	482.3	405.9
Equity contract
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	147.1	89.4
Designated as Hedging Instrument \| Cash flow hedges \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	35.3	35.3
Designated as Hedging Instrument \| Cash flow hedges \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	449.8	230.5
Designated as Hedging Instrument \| Cash flow hedges \| Derivatives \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0.1	0.4
Derivatives, Liability Fair Value	0.0	0.2
Designated as Hedging Instrument \| Cash flow hedges \| Derivatives \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0.0	12.8
Derivatives, Liability Fair Value	34.8	6.3
Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	834.7	425.5
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	23,486.1	29,112.2
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	32.5	175.4
Not Designated as Hedging Instrument \| Equity contract
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	147.1	89.4
Not Designated as Hedging Instrument \| Fixed maturities
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	14.0	17.5
Derivatives, Liability Fair Value	0.0	0.0
Not Designated as Hedging Instrument \| Within products
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0.0	0.0
Derivatives, Liability Fair Value	156.2	173.8
Not Designated as Hedging Instrument \| Reinsurance agreements
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0.0	0.0
Derivatives, Liability Fair Value	(25.2)	(43.5)
Not Designated as Hedging Instrument \| Managed custody guarantees
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0.0	0.0
Derivatives, Liability Fair Value	0.0	0.0
Not Designated as Hedging Instrument \| Derivatives \| Credit contracts
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	9.6	5.6
Derivatives, Liability Fair Value	6.0	0.2
Not Designated as Hedging Instrument \| Derivatives \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	119.4	437.1
Derivatives, Liability Fair Value	16.5	154.2
Not Designated as Hedging Instrument \| Derivatives \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0.0	12.6
Derivatives, Liability Fair Value	0.8	12.0
Not Designated as Hedging Instrument \| Derivatives \| Equity contract
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	5.5	2.3
Derivatives, Liability Fair Value	$ 3.5	$ 0.0

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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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

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+ References

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