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Investments - Schedule of Investments (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 4,906,800,000 | $ 4,846,800,000
Available-for-sale Securities, Debt Securities | 5,263,900,000 | 5,124,900,000
Available for sale Securities, Equity Securities, Cost | 463,800,000 | 434,400,000
Available for sale Securities, Equity Securities, Fair Value | 500,000,000 | 481,700,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Due in One Year or Less - Amortized Cost | 179,400,000 |
Due in One Year or Less - Fair Value | 181,800,000 |
Due after One Year to Five Years - Amortized Cost | 790,200,000 |
Due after One Year to Five Years - Fair Value | 818,000,000 |
Due after Five Years to Ten Years - Amortized Cost | 1,626,900,000 |
Due after Five Years to Ten Years - Fair Value | 1,699,700,000 |
Due after Ten Years - Amortized Cost | 2,028,600,000 |
Due after Ten Years - Fair Value | 2,272,200,000 |
Asset-backed Securities Not Due in a Single Maturity Date - Amortized Cost | 281,700,000 |
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value | 292,200,000 |
Available-for-sale Securities, Debt Securities | 5,263,900,000 | 5,124,900,000
Other Receivables | 190,100,000 | 198,600,000
Other Liabilities | 461,700,000 | 453,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 798,800,000 | 1,273,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (19,600,000) | (40,500,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 134,700,000 | 190,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (7,800,000) | (11,600,000)
Total, Fair Value | 933,500,000 | 1,464,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (27,400,000) | (52,100,000)
Available-for-sale-Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses | 100,000 | 100,000
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 | (200,000) | 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 | 339,900,000 | 321,200,000
Available-for-sale Debt Securities Gross Unrealized Gain | 22,100,000 | 22,300,000
Available-for-sale Debt Securities, Gross Unrealized Loss | (5,300,000) | (7,200,000)
Available-for-sale Securities, Debt Securities | 356,700,000 | 336,300,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, Debt Securities | 356,700,000 | 336,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 116,200,000 | 117,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (5,300,000) | (7,200,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,000,000 | 1,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total, Fair Value | 117,200,000 | 118,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (5,300,000) | (7,200,000)
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 | 149,200,000 |
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 | 11,900,000 |
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 | 4,300,000 |
Foreign Government Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 3,700,000 | 3,500,000
Available-for-sale Debt Securities Gross Unrealized Gain | 100,000 | 0
Available-for-sale Debt Securities, Gross Unrealized Loss | 0 | (100,000)
Available-for-sale Securities, Debt Securities | 3,800,000 | 3,400,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, Debt Securities | 3,800,000 | 3,400,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,200,000 | 2,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (100,000)
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 | 1,200,000 | 2,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 0 | (100,000)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,646,000,000 | 1,640,600,000
Available-for-sale Debt Securities Gross Unrealized Gain | 111,000,000 | 88,400,000
Available-for-sale Debt Securities, Gross Unrealized Loss | (4,400,000) | (14,100,000)
Available-for-sale Securities, Debt Securities | 1,752,600,000 | 1,714,900,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, Debt Securities | 1,752,600,000 | 1,714,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 217,800,000 | 432,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (4,400,000) | (14,100,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 400,000 | 300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total, Fair Value | 218,200,000 | 433,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (4,400,000) | (14,100,000)
Corporate Bonds and Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 2,796,200,000 | 2,758,900,000
Available-for-sale Debt Securities Gross Unrealized Gain | 241,700,000 | 209,900,000
Available-for-sale Debt Securities, Gross Unrealized Loss | (13,000,000) | (24,000,000)
Available-for-sale Securities, Debt Securities | 3,024,900,000 | 2,944,800,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, Debt Securities | 3,024,900,000 | 2,944,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 355,700,000 | 663,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (7,700,000) | (16,600,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 93,700,000 | 107,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5,300,000) | (7,400,000)
Total, Fair Value | 449,400,000 | 770,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (13,000,000) | (24,000,000)
Redeemable Preferred Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 100,000 | 500,000
Available-for-sale Debt Securities Gross Unrealized Gain | 0 | 100,000
Available-for-sale Debt Securities, Gross Unrealized Loss | 0 | 0
Available-for-sale Securities, Debt Securities | 100,000 | 600,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, Debt Securities | 100,000 | 600,000
Collateralized Loan Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 120,500,000 | 121,200,000
Available-for-sale Debt Securities Gross Unrealized Gain | 4,200,000 | 2,700,000
Available-for-sale Debt Securities, Gross Unrealized Loss | 0 | (1,100,000)
Available-for-sale Securities, Debt Securities | 124,700,000 | 122,800,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, Debt Securities | 124,700,000 | 122,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,500,000 | 19,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (700,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 5,100,000 | 21,400,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | (400,000)
Total, Fair Value | 6,600,000 | 41,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 0 | (1,100,000)
Other Mortgage- and Asset-backed [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 400,000 | 900,000
Available-for-sale Debt Securities Gross Unrealized Gain | 700,000 | 1,200,000
Available-for-sale Debt Securities, Gross Unrealized Loss | 0 | 0
Available-for-sale Securities, Debt Securities | 1,100,000 | 2,100,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, Debt Securities | 1,100,000 | 2,100,000
Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 4,906,800,000 | 4,846,800,000
Available-for-sale Debt Securities Gross Unrealized Gain | 379,800,000 | 324,600,000
Available-for-sale Debt Securities, Gross Unrealized Loss | (22,700,000) | (46,500,000)
Available-for-sale Securities, Debt Securities | 5,263,900,000 | 5,124,900,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, Debt Securities | 5,263,900,000 | 5,124,900,000
Other Receivables | 0 | 2,700,000
Other Liabilities | 6,300,000 | 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 | 692,400,000 | 1,235,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (17,400,000) | (38,700,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 100,200,000 | 130,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5,300,000) | (7,800,000)
Total, Fair Value | 792,600,000 | 1,365,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (22,700,000) | (46,500,000)
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 | (14,000,000) | (33,800,000)
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 | $ (8,700,000) | $ (12,700,000)
Percentage of Unrealized Loss Position to Amortized Cost Basis of Available for Sale Security Average | 5.00% | 5.00%
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 | $ 126,800,000 |
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale Securities, Equity Securities, Cost | 463,800,000 | $ 434,400,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 40,900,000 | 52,900,000
Available-for-sale Equity Securities, Gross Unrealized Loss | (4,700,000) | (5,600,000)
Available for sale Securities, Equity Securities, Fair Value | 500,000,000 | 481,700,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Other Receivables | 3,900,000 | 200,000
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 | 106,400,000 | 38,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2,200,000) | (1,800,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 34,500,000 | 60,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,500,000) | (3,800,000)
Total, Fair Value | 140,900,000 | 98,400,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (4,700,000) | (5,600,000)
Preferred Stock [Member] | Finance, Insurance and Real Estate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale Securities, Equity Securities, Cost | 53,600,000 | 58,100,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 4,900,000 | 2,300,000
Available-for-sale Equity Securities, Gross Unrealized Loss | 0 | (800,000)
Available for sale Securities, Equity Securities, Fair Value | 58,500,000 | 59,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 15,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (500,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 200,000 | 7,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | (300,000)
Total, Fair Value | 200,000 | 22,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 0 | (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 | 18,300,000 | 18,500,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 5,000,000 | 4,900,000
Available-for-sale Equity Securities, Gross Unrealized Loss | 0 | (500,000)
Available for sale Securities, Equity Securities, Fair Value | 23,300,000 | 22,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 200,000 | 5,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (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 | 200,000 | 5,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 0 | (500,000)
Common Stocks [Member] | Finance, Insurance and Real Estate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale Securities, Equity Securities, Cost | 6,700,000 | 31,200,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 1,000,000 | 2,300,000
Available-for-sale Equity Securities, Gross Unrealized Loss | 0 | 0
Available for sale Securities, Equity Securities, Fair Value | 7,700,000 | 33,500,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 2,800,000
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 |  | 2,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments |  | 0
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 | 9,100,000 | 7,200,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 3,500,000 | 4,600,000
Available-for-sale Equity Securities, Gross Unrealized Loss | (300,000) | (100,000)
Available for sale Securities, Equity Securities, Fair Value | 12,300,000 | 11,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 800,000 | 600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (300,000) | (100,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 500,000 | 500,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total, Fair Value | 1,300,000 | 1,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (300,000) | (100,000)
Exchange Traded Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale Securities, Equity Securities, Cost | 193,900,000 | 136,100,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 4,200,000 | 9,600,000
Available-for-sale Equity Securities, Gross Unrealized Loss | (600,000) | (1,300,000)
Available for sale Securities, Equity Securities, Fair Value | 197,500,000 | 144,400,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 73,700,000 | 0
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 | 0 | 18,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | (1,300,000)
Total, Fair Value | 73,700,000 | 18,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (600,000) | (1,300,000)
Limited Liability Companies and Limited Partnerships [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale Securities, Equity Securities, Cost | 182,200,000 | 183,300,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 22,300,000 | 29,200,000
Available-for-sale Equity Securities, Gross Unrealized Loss | (3,800,000) | (2,900,000)
Available for sale Securities, Equity Securities, Fair Value | 200,700,000 | 209,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 31,700,000 | 13,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,300,000) | (700,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 33,800,000 | 33,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,500,000) | (2,200,000)
Total, Fair Value | 65,500,000 | 47,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | $ (3,800,000) | $ (2,900,000)

X
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