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Schedule of Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Changes in Components of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | $ 8,557.8 | $ 8,179.9 | $ 8,612.6 |
Other Comprehensive Income (Loss), Net of Tax | (142.3) | (6.4) |  |
Total Reclassification Adjustments from AOCI to Net Income, Net of Tax | 0.4 |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] |  |  |  |
Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax | (7.8) |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | (278.5) | (197.2) |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain from Cash Flow Hedges, Effect Net of Tax | 399.6 |  | 401.6 |
Other Comprehensive Income (Loss), Unrealized (Loss) on Derivatives Arising During Period, Net of Tax | (1.2) |  |  |
Cash Flow Hedge Gain Reclassified to Earnings, Net of Tax | (0.8) |  |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | (2.0) | (10.7) |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | (142.5) |  | (72.6) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Loss Arising During Period, Net of Tax | (69.9) |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax | 0 |  |  |
Change in Foreign Currency Translation Adjustment | (69.9) | 28.2 |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax | (563.8) |  | (574.5) |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain Arising During Period, Net of Tax | 1.7 |  |  |
Reclassification Adjustment on Pension and Other Postretirement Benefit Plans, Net Loss Recognized in Net Periodic Benefit Cost, Net of Tax | 9.0 |  |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | 10.7 |  |  |
Accumulated Other Comprehensive Income [Member] |  |  |  |
Changes in Components of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | 485.7 | 455.4 | 628.0 | 461.8
Other Comprehensive Income (Loss), Net of Tax | (142.3) | (6.4) |  |
Before Reclassification Adjustment [Member] |  |  |  |
Changes in Components of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (142.7) |  |  |
Includes Unrealized Adjustment for Deferred Policy Acquisition Costs and Reserves for Future Policy and Contract Benefits [Member] |  |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | 792.4 |  | 873.5 |
Other Comprehensive Income (Loss), Unrealized Holding (Loss) on Securities Arising During Period, Net of Tax | (73.3) |  |  |
Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax | (7.8) |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | $ (81.1) |  |  |

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