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Investments Hybrid Securities (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Hybrid Securities [Line Items]
Hybrid securities	$ 142.9	$ 219.5
Fixed maturities | State and local government obligations
Hybrid Securities [Line Items]
Hybrid securities	6.1	0.0
Fixed maturities | Corporate debt securities
Hybrid Securities [Line Items]
Hybrid securities	99.8	40.1
Fixed maturities | Residential mortgage-backed securities
Hybrid Securities [Line Items]
Hybrid securities	0.0	170.5
Fixed maturities | Other asset-backed securities
Hybrid Securities [Line Items]
Hybrid securities	6.7	8.9
Fixed maturities | Redeemable preferred stocks
Hybrid Securities [Line Items]
Hybrid securities	$ 30.3	$ 0.0

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- Definition

Hybrid Securities [Line Items]

+ References

No definition available.

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 15
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6437212&loc=d3e50806-113969

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611

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