Investments - Troubled Debt Restructuring (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2014	Dec. 31, 2013 loan
Financing Receivable, Modifications [Line Items]
Number of troubled debt restructurings	0
Troubled debt restructured loans	$ 31.9	$ 37.5
Cross collateralized, cross defaulted
Financing Receivable, Modifications [Line Items]
Number of troubled debt restructurings		20
Commercial mortgage loans
Financing Receivable, Modifications [Line Items]
Number of troubled debt restructurings		20
Troubled debt restructurings pre-modification carrying value		39.4
Troubled debt restructurings post-modification carrying value		39.4
Amount of principal repaid on troubled debt restructurings	$ 7.5

Financing Receivable, Modifications, Proceeds From Principal Payments

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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