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Schedule 4 - Reinsurance Schedule (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
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                      
Ceded to Other Companies                 $ 33.9 $ 42.5 $ 40.7
Assumed Premiums Earned                 52.7 44.0 43.7
Assumed Premiums, Life Insurance in Force                 229.5 242.9 256.9
Premiums, Net, Life Insurance in Force                 20,659.1 20,972.9 21,222.7
Net Amount 495.6 507.5 512.8 509.9 520.8 527.3 529.8 529.2 2,025.8 2,107.1 2,173.6
Life Insurance in Force Premiums, Percentage Assumed to Net                 1.10% 1.20% 1.20%
Direct Premiums Earned                 2,007.0 2,105.6 2,170.6
Premiums, Percentage Assumed to Net                 2.60% 2.10% 2.00%
Direct Premiums, Life Insurance in Force                 21,006.0 21,340.4 21,627.8
Ceded Premiums, Life Insurance in Force                 576.4 610.4 662.0
Life Insurance Product Line [Member]
                      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                      
Ceded to Other Companies                 1.5 1.4 1.5
Assumed Premiums Earned                 1.8 2.0 2.3
Net Amount                 392.7 393.4 395.1
Direct Premiums Earned                 392.4 392.8 394.3
Premiums, Percentage Assumed to Net                 0.50% 0.50% 0.60%
Accident and Health Insurance [Member]
                      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                      
Ceded to Other Companies                 0.6 0.4 0.3
Assumed Premiums Earned                 0.1 0.1 0.1
Net Amount                 161.4 165.2 166.3
Direct Premiums Earned                 161.9 165.5 166.5
Premiums, Percentage Assumed to Net                 0.10% 0.10% 0.10%
Property, Liability and Casualty Insurance [Member]
                      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                      
Ceded to Other Companies                 31.8 40.7 38.9
Assumed Premiums Earned                 50.8 41.9 41.3
Net Amount                 1,471.7 1,548.5 1,612.2
Direct Premiums Earned                 $ 1,452.7 $ 1,547.3 $ 1,609.8
Premiums, Percentage Assumed to Net                 3.50% 2.70% 2.60%