Deferred Policy Acquisition Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Deferred Policy Acquisition Costs:
Balance, end of period	$ 430.9us-gaap_DeferredPolicyAcquisitionCosts	$ 470.1us-gaap_DeferredPolicyAcquisitionCosts
Policy acquisition costs deferred	24.9	16.9
Costs amortized to expenses:
Recurring costs	(15.3)	(27.6)
Assumption unlocking	(4.0)	0
Realized investment gains (losses)	3.8	10.9
Offsets to net unrealized investment gains or losses included in AOCI (1)	(17.3)	(15.5)
Balance, end of period	$ 423.0us-gaap_DeferredPolicyAcquisitionCosts	$ 454.8us-gaap_DeferredPolicyAcquisitionCosts

Gains (losses) on recurring costs.

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- Definition

Deferred policy acquisition gains (losses).

+ References

No definition available.

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- Definition

Amount of amortization of deferred policy acquisition costs due to realized investment gains or losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Section 35

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- Definition

Amount of increase (decrease) in deferred policy acquisition cost (DAC) due to unrealized investment gain (loss).

+ References

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- Definition

Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 16

-Article 12

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 825

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-Number 210

-Section 03

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- Definition

Additions during the period in (a) capitalized policy acquisition costs, and (b) capitalized present value of future profits (also known as PVFP).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 20

-Section S99

-Paragraph 2

-Subparagraph (2)

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