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Investments - Securities Lending Collateral - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Securities Received as Collateral [Abstract]
Securities loaned, minimum collateral to loan ratio	102.00%
Securities loaned, additional collateral requirement, decline in collateral value threshold percentage	100.00%
Cash collateral received and reinvested	$ 95.8	$ 71.5

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- Definition

Securities loaned additional collateral requirement decline in collateral value threshold percentage.

+ References

No definition available.

+ Details

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- Definition

Securities loaned minimum collateral to loan ratio.

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No definition available.

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- Definition

Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.1)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: 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.(a),2)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- References

No definition available.

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