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Debt Schedule (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term Debt | $ 2,570.2 | $ 2,631.3
Securities Lending Agreements - See Note 3 | 312.3 | 0
Short-term Debt | 312.3 | 225.1
Total Debt | 2,882.5 | 2,856.4
Senior Secured Notes variable due 2037 callable at or above par [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 560.0 | 634.4
Senior Secured Notes variable due 2036 callable at or above par [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 72.5 | 82.5
Notes 7.375 Percent due 2032 callable at or above par [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 39.5 | 39.5
Notes at 6.75 Percent due 2028 callable at or above par [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 165.8 | 165.8
Notes 7.25 Percent due 2028 callable at or above par [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 200.0 | 200.0
Notes 5.625 Percent due 2020 callable at or above par [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 399.6 | 399.5
Notes 7.125 Percent due 2016 callable at or above par [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 358.8 | 335.6
Notes 6.85 Percent due 2015 callable at or above par[Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 296.7 | 296.7
Notes 7.0 Percent due 2018 non-callable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 200.0 | 200.0
Medium-term Notes 7.0 Percent to 7.2 Percent due 2023 to 2028 noncallable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 50.8 | 50.8
Junior Subordinated Debt Securities 7.405 Percent due 2038 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 226.5 | 226.5
Notes 7.625 Percent due 2011 callable at or above par [Member] |  |
Debt Instrument [Line Items] |  |
Short-term Debt | $ 0 | $ 225.1

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