Investments - Net Realized Capital Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	$ (55.3)	$ (57.6)
After-tax net realized capital gains (losses), after tax	(36.0)	(37.4)
Proceeds from sale of investments
Proceeds on sales	1,077.1	692.7
Gross gains	5.4	3.9
Gross losses	18.0	37.8
Derivatives
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	3.9	62.9
Other investments
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	(0.1)	(0.1)
Fixed Maturities, Available-for-sale, Including Securities Pledged [Member]
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	(19.1)	(41.2)
Fixed maturities, at fair value using the fair value option
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	(58.8)	(17.3)
Embedded derivatives - fixed maturities
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	(1.5)	0.9
Guaranteed benefit derivatives
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	$ 20.3	$ (62.8)

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563

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The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period.

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3(a))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 325
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502

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Available-for-sale Securities, Gross Realized Gains Losses Sale Proceeds [Abstract]

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Available-for-sale Securities, Including Securities Pledged [Line Items]

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