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Other Comprehensive Income and Accumulated Other Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Gain (Loss) on Investments, Excluding Other than Temporary Impairments $ 26.9 $ 4.9
Net Impairment Losses Recognized in Earnings (1.9) (0.5)
Income (Loss) from Continuing Operations before Income Taxes 84.6 50.4
Interest and Other Expenses 23.8 21.8
Income Tax Expense (Benefit) (26.0) (14.1)
Net Income 58.4 43.6
Reclassification out of Accumulated Other Comprehensive Income [Member]
    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Net Income 12.2 (0.3)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Gain (Loss) on Investments, Excluding Other than Temporary Impairments 26.0 4.4
Net Impairment Losses Recognized in Earnings (1.9) (0.5)
Income (Loss) from Continuing Operations before Income Taxes 24.1 3.9
Income Tax Expense (Benefit) (8.4) (1.4)
Net Income 15.7 2.5
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Interest and Other Expenses (5.4) (4.4)
Income Tax Expense (Benefit) (1.9) (1.6)
Net Income $ (3.5) $ (2.8)