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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period $ 537.6 $ 384.6 $ 520.4 $ 348.1
Included in Condensed Consolidated Statements of Operations (0.2) 2.0 (1.5) 5.6
Included in Other Comprehensive Income (1.5) (4.0) (6.4) (3.0)
Purchases 50.5 52.4 128.8 113.7
Settlements (33.0) (30.4) (84.2) (50.6)
Sales   (0.2) (0.3) (4.2)
Transfers into Level 3 2.8   5.2 0.9
Transfers out of Level 3     (5.8) (6.1)
Balance at End of Period 556.2 404.4 556.2 404.4
Fair Value, Level 1 to level 2 Transfers, Amount 0 0 0 0
Fair Value, Level 2 to Level 1 Transfers, Amount 0 0 0 0
Fair Value, Level 1 to level 3 Transfers, Amount 0 0 0 0
Fair Value, Level 3 to level 1 Transfers, Amount 0 0 0 0
Corporate Bonds and Notes [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 343.5 259.2 361.0 235.1
Included in Condensed Consolidated Statements of Operations (0.1) 2.0 (0.9) 2.1
Included in Other Comprehensive Income (4.3) (0.2) (8.1) 0.7
Purchases 36.9 40.7 75.6 85.5
Settlements (27.3) (25.2) (73.1) (41.4)
Sales   (0.2) 0 (0.5)
Transfers into Level 3 2.8   2.8 0.9
Transfers out of Level 3     (5.8) (6.1)
Balance at End of Period 351.5 276.3 351.5 276.3
Redeemable Preferred Stocks [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 4.4 6.3 4.7 6.1
Included in Condensed Consolidated Statements of Operations (0.1) 0 (0.4) 0
Included in Other Comprehensive Income 0 (0.1) 0 0.1
Purchases 0 0 0 0
Settlements 0 (1.6) 0 (1.6)
Sales   0 0 0
Transfers into Level 3 0   0 0
Transfers out of Level 3     0 0
Balance at End of Period 4.3 4.6 4.3 4.6
Mortgage and Asset-backed [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 31.2 0.3 0.1 0.3
Included in Condensed Consolidated Statements of Operations 0.1 0 0.1 0
Included in Other Comprehensive Income (0.3) 0 (0.6) 0
Purchases 5.6 0 34.6 0
Settlements (0.1) (0.1) (0.1) (0.1)
Sales   0 0 0
Transfers into Level 3 0   2.4 0
Transfers out of Level 3     0 0
Balance at End of Period 36.5 0.2 36.5 0.2
Preferred and Common Stocks [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 14.6 12.3 13.3 13.5
Included in Condensed Consolidated Statements of Operations (0.1) 0 (0.1) 3.2
Included in Other Comprehensive Income 1.6 0.4 3.1 (0.8)
Purchases 0.5 0.7 0.6 1.2
Settlements 0 0 0 0
Sales   0 (0.3) (3.7)
Transfers into Level 3 0   0 0
Transfers out of Level 3     0 0
Balance at End of Period 16.6 13.4 16.6 13.4
Other Equity Interests [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 143.9 106.5 141.3 93.1
Included in Condensed Consolidated Statements of Operations 0 0 (0.2) 0.3
Included in Other Comprehensive Income 1.5 (4.1) (0.8) (3.0)
Purchases 7.5 11.0 18.0 27.0
Settlements (5.6) (3.5) (11.0) (7.5)
Sales   0 0 0
Transfers into Level 3 0   0 0
Transfers out of Level 3     0 0
Balance at End of Period $ 147.3 $ 109.9 $ 147.3 $ 109.9