Sales Inducements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in Deferred Sales Inducement Activity:
Balance, beginning of period	$ 76.9us-gaap_DeferredSalesInducementsNet	$ 63.3us-gaap_DeferredSalesInducementsNet	$ 50.6us-gaap_DeferredSalesInducementsNet
Sales inducements deferred	17.4	10.7	15.4
Amortization charged to income	(7.9)	(8.5)	(5.8)
Offsets to net unrealized investment gains or losses included in AOCI	(7.5)	11.4	3.1
Balance, end of period	$ 78.9us-gaap_DeferredSalesInducementsNet	$ 76.9us-gaap_DeferredSalesInducementsNet	$ 63.3us-gaap_DeferredSalesInducementsNet

Offsets to net unrealized investment gains or (losses) included in AOCI.

No definition available.

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- Definition

Amount of any adjustments, including write-offs and the effect of dispositions and internal replacements of contracts, that increases or decreases the gross carrying amount of deferred sales inducements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 30

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11332-158416

+ Details

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- Definition

The amount of deferred sales inducement costs charged against earnings during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11332-158416

+ Details

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- Definition

The unamortized carrying amount of deferred sales inducement costs as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11332-158416

+ Details

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- Details

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