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Schedule IV Reinsurance (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Gross Amount | $ 7,521.5 | $ 7,434.3 | $ 7,494.7
Ceded to Other Companies | 223.9 | 244.2 | 258.7
Assumed from Other Companies | 216.6 | 241.3 | 239.5
Net Amount | 7,514.2 | 7,431.4 | 7,475.5
Percentage of Amount Assumed to Net | 2.90% | 3.20% | 3.20%
Life Insurance in Force |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Gross Amount | 782,935.6 | 740,779.6 | 675,382.0
Ceded to Other Companies | 28,341.1 | 28,385.4 | 28,027.1
Assumed from Other Companies | 1,141.6 | 1,850.5 | 1,895.5
Net Amount | 755,736.1 | 714,244.7 | 649,250.4
Percentage of Amount Assumed to Net | 0.20% | 0.30% | 0.30%
Life Insurance Segment |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Gross Amount | 1,868.8 | 1,810.9 | 1,757.5
Ceded to Other Companies | 146.6 | 159.1 | 166.4
Assumed from Other Companies | 10.9 | 12.5 | 11.8
Net Amount | 1,733.1 | 1,664.3 | 1,602.9
Percentage of Amount Assumed to Net | 0.60% | 0.80% | 0.70%
Accident and Health Insurance Segment |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Gross Amount | 5,652.7 | 5,623.4 | 5,737.2
Ceded to Other Companies | 77.3 | 85.1 | 92.3
Assumed from Other Companies | 205.7 | 228.8 | 227.7
Net Amount | $ 5,781.1 | $ 5,767.1 | $ 5,872.6
Percentage of Amount Assumed to Net | 3.60% | 4.00% | 3.90%

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- Definition Amount of premiums assumed from other companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Amount of premiums ceded to other companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Gross amount of premium revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Net amount of gross premiums, less premiums ceded to other companies, plus premiums assumed from other companies; which represents the net amount of premium revenue on the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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