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Other Comprehensive Income And Accumulated Other Comprehensive Income Reclassification from AOCI to Consolidated Statements of Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net Realized Gains (Losses) on Sales of Investments $ 20.8 $ 49.1 $ 2.3 $ 26.9 $ 5.5 $ 50.9 $ 4.1 $ 4.9 $ 99.1 $ 65.4 $ 33.7
Net Impairment Losses Recognized in Earnings (7.6) (3.4) (1.0) (1.9) (2.8) (3.2) (0.4) (0.5) (13.9) (6.9) (11.3)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest         (6.0) 81.5 (3.5) 50.4   122.4  
Income Tax Expense (26.6) (33.4) (13.9) (26.0) 4.3 (25.9) 5.1 (14.1) (99.9) (30.6) (6.6)
Net Income 55.2 70.1 34.0 58.4 1.9 55.6 2.3 43.6 217.7 103.4 74.5
Interest and Other Expenses (26.2) (25.3) (25.2) (23.8) (20.1) (22.7) (20.9) (21.8) (100.5) (85.5) (83.9)
Reclassification out of Accumulated Other Comprehensive Income [Member]
                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net Income                 8.5 29.2 14.4
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net Realized Gains (Losses) on Sales of Investments                 51.8 65.0 35.0
Net Impairment Losses Recognized in Earnings                 (13.9) (3.8) (4.1)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest                 37.9 61.2 30.9
Income Tax Expense                 (13.2) (21.5) (10.9)
Net Income                 24.7 39.7 20.0
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Income Tax Expense                 8.8 5.7 3.1
Net Income                 (16.2) (10.5) (5.6)
Interest and Other Expenses                 $ (25.0) $ (16.2) $ (8.7)