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Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months Fair Value | $ 2,041.7 | $ 3,467.6
Less than 12 Months Gross Unrealized Loss | 79.5 | 121.3
12 Months or Greater Fair Value | 949.2 | 1,290.1
12 Months or Greater Gross Unrealized Loss | 142.7 | 116.1
United States Government and Government Agencies and Authorities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months Fair Value | 0 | 23.9
Less than 12 Months Gross Unrealized Loss | 0 | 3.1
12 Months or Greater Fair Value | 6.3 | 10.9
12 Months or Greater Gross Unrealized Loss | 1.1 | 5.5
States, Municipalities, and Political Subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months Fair Value | 51.6 | 660.6
Less than 12 Months Gross Unrealized Loss | 1.3 | 28.4
12 Months or Greater Fair Value | 75.3 | 100.3
12 Months or Greater Gross Unrealized Loss | 7.5 | 18.9
Public Utilities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months Fair Value | 192.0 | 1,073.8
Less than 12 Months Gross Unrealized Loss | 7.9 | 41.0
12 Months or Greater Fair Value | 142.2 | 41.0
12 Months or Greater Gross Unrealized Loss | 20.7 | 3.3
Mortgage/Asset-backed Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months Fair Value | 94.2 | 34.5
Less than 12 Months Gross Unrealized Loss | 4.8 | 0.1
12 Months or Greater Fair Value | 19.6 | 45.5
12 Months or Greater Gross Unrealized Loss | 0.7 | 0.5
All Other Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months Fair Value | 1,703.9 | 1,667.2
Less than 12 Months Gross Unrealized Loss | 65.5 | 48.3
12 Months or Greater Fair Value | 684.9 | 1,071.7
12 Months or Greater Gross Unrealized Loss | 110.8 | 85.8
Redeemable Preferred Stocks |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months Fair Value | 0 | 7.6
Less than 12 Months Gross Unrealized Loss | 0 | 0.4
12 Months or Greater Fair Value | 20.9 | 20.7
12 Months or Greater Gross Unrealized Loss | $ 1.9 | $ 2.1

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- Definition This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a -Clause 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a -Clause 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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