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Parent Company Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | ---
Assets [Abstract] |  |  |  |
Fixed Maturity Securities | $ 42,486.7 |  | $ 40,035.6 |
Mortgage Loans | 1,612.3 | [1] | 1,516.8 |
Short-term Investments | 1,423.5 |  | 1,163.1 |
Other Assets | 645.3 |  | 650.6 |
Total Assets | 60,179.0 |  | 57,307.7 |
Liabilities |  |  |  |
Short-term Debt | 312.3 |  | 225.1 |
Long-term Debt | 2,570.2 |  | 2,631.3 |
Other Liabilities | 1,815.1 |  | 1,567.6 |
Total Liabilities | 51,602.0 |  | 48,363.3 |
Common Stock | 35.9 |  | 36.5 |
Additional Paid-in Capital | 2,591.1 |  | 2,615.4 |
Retained Earnings | 7,031.2 |  | 7,060.8 |
Treasury Stock | 1,530.1 |  | 1,110.2 |
Total Stockholders' Equity | 8,577.0 |  | 8,944.4 | 8,500.1
Total Liabilities and Stockholders' Equity | 60,179.0 |  | 57,307.7 |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Fixed Maturity Securities | 172.7 |  | 357.5 |
Mortgage Loans | 22.5 |  | 22.9 |
Short-term Investments | 473.9 |  | 666.7 |
Investments in Subsidiaries | 9,704.1 |  | 9,756.4 |
Other Assets | 650.3 |  | 550.3 |
Total Assets | 11,023.5 |  | 11,353.8 |
Liabilities |  |  |  |
Short-term Debt | 2.5 |  | 225.1 |
Long-term Debt | 1,641.0 |  | 1,617.7 |
Other Liabilities | 803.0 |  | 566.6 |
Total Liabilities | 2,446.5 |  | 2,409.4 |
Common Stock | 35.9 |  | 36.5 |
Additional Paid-in Capital | 2,591.1 |  | 2,615.4 |
Accumulated Other Comprehensive Income | 448.9 |  | 341.9 |
Retained Earnings | 7,031.2 |  | 7,060.8 |
Treasury Stock | (1,530.1) |  | (1,110.2) |
Total Stockholders' Equity | 8,577.0 |  | 8,944.4 |
Total Liabilities and Stockholders' Equity | $ 11,023.5 |  | $ 11,353.8 |
[1] | Amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and accretion of discounts.

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