Investments - Fixed Maturities and Equity Securities, Repurchase Agreement, Securities Lending, VIEs (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale Securities Including Securities Pledged [Line Items]
Securities received as collateral	$ 315.8	$ 0.0
Payables under securities loan agreement, including collateral held	648.5	541.3
Collateralized loan obligations \| Not a primary beneficiary of the VIE
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Carrying value of VIE	347.8	0.4
Securities pledged
Available-for-sale Securities Including Securities Pledged [Line Items]
Fair value of loaned securities	548.2	178.9
Short-term investments
Available-for-sale Securities Including Securities Pledged [Line Items]
Securities received as collateral	248.4	185.9
Payables under securities loan agreement, including collateral held
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreement, including collateral held	$ 248.4	$ 185.9
Mortgage-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Percentage collateralized of mortgage backed securities including interest-only strip or principal-only strip	58.40%	63.80%
U.S. Treasuries
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreement, including collateral held	$ 303.6	$ 0.0
U.S. corporate public securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreement, including collateral held	179.6	111.7
Foreign corporate public securities and foreign governments
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreement, including collateral held	79.6	74.2
Equity securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreement, including collateral held	0.4	0.0
Short-term investments
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreement, including collateral held	1.0	0.0
Payables under securities loan agreements
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreement, including collateral held	$ 564.2	$ 185.9

The fair value of collateral received by the entity associated with securities borrowed that must be returned if the counterparty fulfills its obligations. It appears on the balance sheet as a liability and has a corresponding asset that appears on the balance sheet called Securities Received as Collateral.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Collateral
-URI http://asc.fasb.org/extlink&oid=6507830

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Fair value of the securities pledged as collateral against securities loaned.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 10
-Section 05
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=64836671&loc=d3e93645-111703

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1A
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Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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-Paragraph 4
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Available-for-sale Securities, Including Securities Pledged [Line Items]

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Percent Collateralized Mortgage Backed Securities including Interest-Only Strip or Principal-Only Strip

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