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Investments - Schedule of Investments (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis $ 4,677,600,000 $ 4,560,700,000
Available-for-sale Securities, Debt Securities 5,170,100,000 4,852,300,000
Available for sale Securities, Equity Securities, Cost 452,300,000 486,900,000
Available for sale Securities, Equity Securities, Fair Value 504,900,000 523,200,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Due in One Year or Less - Amortized Cost 66,400,000  
Due in One Year or Less - Fair Value 67,700,000  
Due after One Year to Five Years - Amortized Cost 921,000,000  
Due after One Year to Five Years - Fair Value 960,300,000  
Due after Five Years to Ten Years - Amortized Cost 1,530,100,000  
Due after Five Years to Ten Years - Fair Value 1,641,100,000  
Due after Ten Years - Amortized Cost 1,921,800,000  
Due after Ten Years - Fair Value 2,253,300,000  
Asset-backed Securities Not Due in a Single Maturity Date - Amortized Cost 238,300,000  
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value 247,700,000  
Available-for-sale Securities, Debt Securities 5,170,100,000 4,852,300,000
Other Receivables 197,900,000 193,200,000
Other Liabilities 513,000,000 472,400,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 365,500,000 1,195,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (11,100,000) (39,300,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 192,000,000 172,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (9,200,000) (17,700,000)
Total, Fair Value 557,500,000 1,367,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments (20,300,000) (57,000,000)
Available-for-sale-Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses 0 200,000
Available For Sale Securities, Continuous Unrealized Loss Position, Credit Losses Recognized Related to Securities in An Unrealized Loss Position, In a Position of 12 Months or Longer 0 0
US Government and Government Agencies and Authorities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 277,400,000 298,000,000
Available-for-sale Debt Securities Gross Unrealized Gain 33,200,000 26,200,000
Available-for-sale Debt Securities, Gross Unrealized Loss (300,000) (3,600,000)
Available-for-sale Securities, Debt Securities 310,300,000 320,600,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available-for-sale Securities, Debt Securities 310,300,000 320,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 43,000,000 56,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (300,000) (1,600,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,200,000 24,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (2,000,000)
Total, Fair Value 44,200,000 80,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments (300,000) (3,600,000)
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value 104,000,000  
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]    
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value 15,000,000  
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]    
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value 5,300,000  
Foreign Government Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 3,500,000  
Available-for-sale Debt Securities Gross Unrealized Gain 100,000  
Available-for-sale Debt Securities, Gross Unrealized Loss 0  
Available-for-sale Securities, Debt Securities 3,600,000  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available-for-sale Securities, Debt Securities 3,600,000  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 900,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Total, Fair Value 900,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments 0  
States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 1,503,200,000 1,513,700,000
Available-for-sale Debt Securities Gross Unrealized Gain 159,700,000 111,600,000
Available-for-sale Debt Securities, Gross Unrealized Loss (300,000) (2,700,000)
Available-for-sale Securities, Debt Securities 1,662,600,000 1,622,600,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available-for-sale Securities, Debt Securities 1,662,600,000 1,622,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 38,200,000 131,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (300,000) (2,600,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 300,000 900,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (100,000)
Total, Fair Value 38,500,000 131,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments (300,000) (2,700,000)
Bonds and Notes [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 2,770,700,000 2,651,500,000
Available-for-sale Debt Securities Gross Unrealized Gain 311,800,000 202,000,000
Available-for-sale Debt Securities, Gross Unrealized Loss (13,200,000) (40,700,000)
Available-for-sale Securities, Debt Securities 3,069,300,000 2,812,800,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available-for-sale Securities, Debt Securities 3,069,300,000 2,812,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 189,800,000 783,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (5,700,000) (26,000,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 139,300,000 133,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (7,500,000) (14,700,000)
Total, Fair Value 329,100,000 917,400,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments (13,200,000) (40,700,000)
Redeemable Preferred Stocks [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 800,000 3,700,000
Available-for-sale Debt Securities Gross Unrealized Gain 100,000 100,000
Available-for-sale Debt Securities, Gross Unrealized Loss 0 0
Available-for-sale Securities, Debt Securities 900,000 3,800,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available-for-sale Securities, Debt Securities 900,000 3,800,000
Collateralized Loan Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 121,100,000 90,000,000
Available-for-sale Debt Securities Gross Unrealized Gain 1,900,000 300,000
Available-for-sale Debt Securities, Gross Unrealized Loss (1,600,000) (3,000,000)
Available-for-sale Securities, Debt Securities 121,400,000 87,300,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available-for-sale Securities, Debt Securities 121,400,000 87,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 23,000,000 57,400,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (900,000) (2,900,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 23,800,000 800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (700,000) (100,000)
Total, Fair Value 46,800,000 58,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments (1,600,000) (3,000,000)
Other Mortgage- and Asset-backed [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 900,000 3,800,000
Available-for-sale Debt Securities Gross Unrealized Gain 1,100,000 1,400,000
Available-for-sale Debt Securities, Gross Unrealized Loss 0 0
Available-for-sale Securities, Debt Securities 2,000,000 5,200,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available-for-sale Securities, Debt Securities 2,000,000 5,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 200,000 300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Total, Fair Value 200,000 300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments 0 0
Fixed Maturities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 4,677,600,000 4,560,700,000
Available-for-sale Debt Securities Gross Unrealized Gain 507,900,000 341,600,000
Available-for-sale Debt Securities, Gross Unrealized Loss (15,400,000) (50,000,000)
Available-for-sale Securities, Debt Securities 5,170,100,000 4,852,300,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available-for-sale Securities, Debt Securities 5,170,100,000 4,852,300,000
Other Receivables 100,000 0
Other Liabilities 18,800,000 5,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 294,900,000 1,028,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (7,200,000) (33,100,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 164,800,000 159,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (8,200,000) (16,900,000)
Total, Fair Value 459,700,000 1,188,500,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments (15,400,000) (50,000,000)
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments (2,100,000) (33,500,000)
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments $ (13,300,000) $ (16,500,000)
Percentage of Unrealized Loss Position to Amortized Cost Basis of Available for Sale Security Average 5.00% 8.00%
Other Non-Governmental Issuers [Member]    
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value $ 123,400,000  
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale Securities, Equity Securities, Cost 452,300,000 $ 486,900,000
Available-for-sale Equity Securities, Gross Unrealized Gain 57,500,000 43,300,000
Available-for-sale Equity Securities, Gross Unrealized Loss (4,900,000) (7,000,000)
Available for sale Securities, Equity Securities, Fair Value 504,900,000 523,200,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Other Receivables 300,000 0
Other Liabilities 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 70,600,000 167,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3,900,000) (6,200,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 27,200,000 12,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,000,000) (800,000)
Total, Fair Value 97,800,000 179,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments (4,900,000) (7,000,000)
Preferred Stock [Member] | Finance, Insurance and Real Estate [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale Securities, Equity Securities, Cost 79,100,000 80,800,000
Available-for-sale Equity Securities, Gross Unrealized Gain 4,700,000 4,900,000
Available-for-sale Equity Securities, Gross Unrealized Loss (800,000) (800,000)
Available for sale Securities, Equity Securities, Fair Value 83,000,000 84,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 15,100,000 2,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (600,000) 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 7,500,000 12,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (200,000) (800,000)
Total, Fair Value 22,600,000 15,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments (800,000) (800,000)
Preferred Stock [Member] | All Industries Other than Finance, Insurance and Real Estate [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale Securities, Equity Securities, Cost 21,100,000 17,100,000
Available-for-sale Equity Securities, Gross Unrealized Gain 4,800,000 2,700,000
Available-for-sale Equity Securities, Gross Unrealized Loss (400,000) (800,000)
Available for sale Securities, Equity Securities, Fair Value 25,500,000 19,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 8,300,000 7,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (400,000) (800,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Total, Fair Value 8,300,000 7,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments (400,000) (800,000)
Common Stocks [Member] | Finance, Insurance and Real Estate [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale Securities, Equity Securities, Cost 15,500,000 18,900,000
Available-for-sale Equity Securities, Gross Unrealized Gain 8,800,000 5,300,000
Available-for-sale Equity Securities, Gross Unrealized Loss 0 (1,000,000)
Available for sale Securities, Equity Securities, Fair Value 24,300,000 23,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   16,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (1,000,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0
Total, Fair Value   16,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments   (1,000,000)
Common Stocks [Member] | All Industries Other than Finance, Insurance and Real Estate [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale Securities, Equity Securities, Cost 7,600,000 9,400,000
Available-for-sale Equity Securities, Gross Unrealized Gain 5,200,000 4,300,000
Available-for-sale Equity Securities, Gross Unrealized Loss 0 (200,000)
Available for sale Securities, Equity Securities, Fair Value 12,800,000 13,500,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 500,000 2,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (200,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 500,000 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Total, Fair Value 1,000,000 2,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments 0 (200,000)
Exchange Traded Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale Securities, Equity Securities, Cost 145,100,000 179,700,000
Available-for-sale Equity Securities, Gross Unrealized Gain 7,000,000 1,100,000
Available-for-sale Equity Securities, Gross Unrealized Loss (800,000) (3,700,000)
Available for sale Securities, Equity Securities, Fair Value 151,300,000 177,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 135,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (3,700,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 19,200,000 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (800,000) 0
Total, Fair Value 19,200,000 135,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments (800,000) (3,700,000)
Limited Liability Companies and Limited Partnerships [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale Securities, Equity Securities, Cost 183,900,000 181,000,000
Available-for-sale Equity Securities, Gross Unrealized Gain 27,000,000 25,000,000
Available-for-sale Equity Securities, Gross Unrealized Loss (2,900,000) (500,000)
Available for sale Securities, Equity Securities, Fair Value 208,000,000 205,500,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 46,700,000 2,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2,900,000) (500,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Total, Fair Value 46,700,000 2,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments $ (2,900,000) $ (500,000)