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Income From Investments - Net Investment 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
Investment Income:                      
Short-term Investments                 $ 0.1 $ 0.2 $ 0.1
Loans to Policyholders                 19.8 18.9 17.7
Real Estate                 20.8 27.4 26.0
Equity Method Limited Liability Investments                 26.4 9.3 9.6
Other                 0 0.1 0.3
Total Investment Income                 340.6 327.7 325.5
Investment Expenses:                      
Other Investment Expenses                 25.9 31.8 27.5
Net Investment Income 76.9 82.4 74.6 80.8 72.9 70.4 75.2 77.4 314.7 295.9 298.0
Accrued Investment Income Receivable 66.7       72.4       66.7 72.4  
Real Estate Investment [Member]
                      
Investment Expenses:                      
Other Investment Expenses                 18.3 26.1 25.9
Other Investment [Member]
                      
Investment Expenses:                      
Other Investment Expenses                 7.6 5.7 1.6
Fixed Maturities [Member]
                      
Investment Income:                      
Interest and Dividends on Fixed Maturities                 235.5 246.1 246.6
Equity Securities [Member]
                      
Investment Income:                      
Dividends on Equity Securities                 $ 38.0 $ 25.7 $ 25.2