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Location of Gains and Losses on Derivative Financial Instruments Designated as Cash Flow Hedging Instruments (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | $ 72.7 |  | $ (4.1) |  | $ 44.5 |
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | 45.7 |  | 10.7 |  | (41.6) |
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) |  |  |  |  | 12.3 |
Interest Rate Swaps | Net Investment Income |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | 50.3 |  | 28.1 |  | 87.7 |
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | 34.8 | [1] | 29.5 | [1] | 24.9 | [1]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) |  |  |  |  | 0 |
Interest Rate Swaps | Net Realized Investments Gain (Loss) |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | 0 |  | 0 |  | 0 |
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | 3.5 | [2] | 7.3 | [2] | 8.1 | [2]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) |  |  |  |  | 0 |
Interest Rate Swaps | Other Income [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) |  |  | 0 |  | 0 |
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) |  |  | (0.4) |  | (0.1) |
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) |  |  |  |  | 0 |
Interest Rate Swaps | Interest and Debt Expenses |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | 0 |  | 0 |  |  |
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | (1.6) | [3] | (0.5) | [4] |  |
Foreign Exchange Contracts | Net Investment Income |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | 0 |  | 0 |  | (2.1) |
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | (1.1) | [1] | (1.9) | [1] | (2.8) | [1]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) |  |  |  |  | 0 |
Foreign Exchange Contracts | Net Realized Investments Gain (Loss) |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | 22.4 |  | (32.2) |  | (83.1) |
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | 10.1 | [2] | (25.6) | [2] | (73.4) | [2]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) |  |  |  |  | (2.0) |
Foreign Exchange Contracts | Interest and Debt Expenses |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) |  |  | 0 |  | 42.0 |
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) |  |  | 2.3 | [3] | 1.7 | [3]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) |  |  |  |  | $ 14.3 |
[1] | Gain (loss) recognized in net investment income
[2] | Gain recognized in net realized investment gain (loss)
[3] | Loss recognized in interest and debt expense
[4] | Loss recognized in other income

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 4 -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 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624177-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -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 The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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