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Significant Accounting Policies (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Policy Loans |  | $ 3,051.4 | $ 2,996.1 |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment |  | 670.9 | 641.6 |
Present Value of Future Insurance Profits |  | 30.3 | 37.6 |
Accumulated Amortization of Other Deferred Costs |  | 119.3 | 112.5 |
Present Value of Future Insurance Profits, Amortization Expense |  | 7.4 | 7.4 | 7.8
Deferred Revenue and Credits |  | 81.0 | 100.2 |
Premium tax expense |  | 134.9 | 129.4 | 130.2
Assets, Participation Fund Account (PFA) |  | 385.5 | 364.4 |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | 407.0 |  | 459.0 | 455.0
Policy Loans Ceded |  |  |  |
Policy Loans |  | $ 2,838.3 | $ 2,790.5 |

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