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Fair Value Measurements - Level 3 Financial Instruments (Details) (Assets measured on recurring basis, Level 3, USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Separate Accounts
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Equity securities, available-for-sale, beginning balance $ 19.9 $ 8.7 $ 16.3 $ 16.1
Total Realized/Unrealized Gains (Losses) Included in Net Income 0 0.3 0 0.7
Total Realized/Unrealized Gains (Losses) Included in OCI 0 0 0 0
Purchases 0.7 0.1 8.0 0.1
Issuances 0 0 0 0
Sales (0.2) (2.0) (10.1) (10.0)
Settlements 0 0 0 0
Transfers in to Level 3 0 1.4 2.2 1.6
Transfers out of Level 3 (14.0) 0 (10.0) 0
Fair Value, Equity securities, available-for-sale, ending balance 6.4 8.5 6.4 8.5
Change in Unrealized Gains (Losses) Included in Earnings 0 0.2 0.1 0.9
Stabilizer (Investment Only) and MCG Contracts
        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Fair Value, Derivatives, beginning balance (28.0) (133.0) (102.0) (221.0)
Total Realized/Unrealized Gains (Losses) Included in Net Income 18.5 21.2 95.7 112.0
Total Realized/Unrealized Gains (Losses) Included in OCI 0 0 0 0
Purchases (1.5) (1.2) (4.7) (4.0)
Issues 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair Value, Derivatives, ending balance (11.0) (113.0) (11.0) (113.0)
Change in Unrealized Gains (Losses) Included in Earnings 0 0 0 0
Embedded Derivative Fixed Indexed Annuity [Member]
        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Fair Value, Derivatives, beginning balance (21.1) (17.6) (20.4) (16.3)
Total Realized/Unrealized Gains (Losses) Included in Net Income (0.6) 0.1 (1.3) (1.2)
Total Realized/Unrealized Gains (Losses) Included in OCI 0 0 0 0
Purchases 0 0 0 0
Issues 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair Value, Derivatives, ending balance (21.7) (17.5) (21.7) (17.5)
Change in Unrealized Gains (Losses) Included in Earnings 0 0 0 0
Derivatives, net
        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Fair Value, Derivatives, beginning balance 0 0 0 (12.7)
Total Realized/Unrealized Gains (Losses) Included in Net Income 0 0 0 (1.7)
Total Realized/Unrealized Gains (Losses) Included in OCI 0 0 0 0
Purchases 0 0 0 0
Issues 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 14.4
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair Value, Derivatives, ending balance 0 0 0 0
Change in Unrealized Gains (Losses) Included in Earnings 0 0 0 0
U.S. corporate, state and municipalities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Fixed maturities, including securities pledged, beginning balance 139.9 151.6 154.6 129.1
Total Realized/Unrealized Gains (Losses) Included in Net Income (0.1) 0 (0.3) (0.2)
Total Realized/Unrealized Gains (Losses) Included in OCI (0.1) 2.0 (1.0) (1.2)
Purchases 0 0 0 7.2
Issuances 0 0 0 0
Sales 0 0 (6.0) 0
Settlements (0.8) (0.9) (3.2) (7.2)
Transfers in to Level 3 0 4.1 17.6 32.7
Transfers out of Level 3 0 0 (22.8) (3.6)
Fair Value, Fixed maturities, including securities pledged, ending balance 138.9 156.8 138.9 156.8
Change in Unrealized Gains (Losses) Included in Earnings (0.1) 0 (0.3) (0.2)
Foreign securities government
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Fixed maturities, including securities pledged, beginning balance 18.7 19.4 24.6 51.1
Total Realized/Unrealized Gains (Losses) Included in Net Income 0 0 0 0.9
Total Realized/Unrealized Gains (Losses) Included in OCI 1.0 (3.6) 1.0 (4.0)
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 (1.9) (5.7)
Settlements (4.0) (2.5) (10.6) (2.5)
Transfers in to Level 3 4.7 21.5 7.3 20.7
Transfers out of Level 3 0 0 0 (25.7)
Fair Value, Fixed maturities, including securities pledged, ending balance 20.4 34.8 20.4 34.8
Change in Unrealized Gains (Losses) Included in Earnings 0 0 0 0
Residential mortgage-backed
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Fixed maturities, including securities pledged, beginning balance 30.8 6.0 9.1 41.0
Total Realized/Unrealized Gains (Losses) Included in Net Income (0.3) (0.1) (1.0) 0.7
Total Realized/Unrealized Gains (Losses) Included in OCI 0.2 (0.5) 0.1 1.3
Purchases 27.0 0 49.4 0
Issuances 0 0 0 0
Sales 0 0 0 (6.0)
Settlements 0 (0.1) 0 (0.1)
Transfers in to Level 3 0 1.3 0 0
Transfers out of Level 3 (0.8) 0 (0.7) (30.3)
Fair Value, Fixed maturities, including securities pledged, ending balance 56.9 6.6 56.9 6.6
Change in Unrealized Gains (Losses) Included in Earnings (0.3) (0.1) (1.0) (0.3)
Other asset-backed Securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Fixed maturities, including securities pledged, beginning balance 24.7 30.1 33.2 27.7
Total Realized/Unrealized Gains (Losses) Included in Net Income 0.3 0.4 1.9 0.8
Total Realized/Unrealized Gains (Losses) Included in OCI (0.2) 1.3 (0.5) 1.8
Purchases 0 10.0 0 10.0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (0.5) (0.4) (10.3) (1.6)
Transfers in to Level 3 0 1.2 0 3.9
Transfers out of Level 3 0 0 0 0
Fair Value, Fixed maturities, including securities pledged, ending balance 24.3 42.6 24.3 42.6
Change in Unrealized Gains (Losses) Included in Earnings 0.3 0.4 0.7 0.8
Fixed maturities, available-for-sale, including securities pledged
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Fixed maturities, including securities pledged, beginning balance 214.1 207.1 221.5 248.9
Total Realized/Unrealized Gains (Losses) Included in Net Income (0.1) 0.3 0.6 2.2
Total Realized/Unrealized Gains (Losses) Included in OCI 0.9 (0.8) (0.4) (2.1)
Purchases 27.0 10.0 49.4 17.2
Issuances 0 0 0 0
Sales 0 0 (7.9) (11.7)
Settlements (5.3) (3.9) (24.1) (11.4)
Transfers in to Level 3 4.7 28.1 24.9 57.3
Transfers out of Level 3 (0.8) 0 (23.5) (59.6)
Fair Value, Fixed maturities, including securities pledged, ending balance 240.5 240.8 240.5 240.8
Change in Unrealized Gains (Losses) Included in Earnings (0.1) 0.3 (0.6) 0.3
Equity securities
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Equity securities, available-for-sale, beginning balance 36.9 18.5 17.0 19.0
Total Realized/Unrealized Gains (Losses) Included in Net Income 0 (0.2) (0.1) (0.2)
Total Realized/Unrealized Gains (Losses) Included in OCI 0 0 2.3 (0.1)
Purchases 0 0 0 0.7
Issuances 0 0 0 0
Sales 0 (1.3) 0 (2.4)
Settlements 0 0 0 0
Transfers in to Level 3 0 0 34.5 0
Transfers out of Level 3 (0.2) 0 (17.0) 0
Fair Value, Equity securities, available-for-sale, ending balance 36.7 17.0 36.7 17.0
Change in Unrealized Gains (Losses) Included in Earnings $ 0 $ 0 $ 0 $ 0