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Investments - Aging of Unrealized Losses on Investments in Fixed Maturities and Equity Securities (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Unsettled purchases or sales of Investments in fixed maturities | $ 472,400,000 | $ 409,600,000
Other receivables | 193,200,000 | 187,000,000
Fair Value |  |
Less Than 12 Months | 1,195,800,000 | 423,600,000
12 Months or Longer | 172,000,000 | 580,700,000
Total | 1,367,800,000 | 1,004,300,000
Unrealized Losses |  |
Less Than 12 Months | (39,400,000) | (9,700,000)
12 Months or Longer | (17,700,000) | (15,000,000)
Total | (57,100,000) | (24,700,000)
Unrealized losses related to securities for which the Company has recognized credit losses in earnings | 200,000 | 0
Available-for-sale-Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses | 0 | 0
US Government and Government Agencies and Authorities [Member] |  |
Fair Value |  |
Less Than 12 Months | 56,600,000 | 24,900,000
12 Months or Longer | 24,100,000 | 55,500,000
Total | 80,700,000 | 80,400,000
Unrealized Losses |  |
Less Than 12 Months | (1,600,000) | (700,000)
12 Months or Longer | (2,000,000) | (1,300,000)
Total | (3,600,000) | (2,000,000)
States and Political Subdivisions [Member] |  |
Fair Value |  |
Less Than 12 Months | 131,000,000 | 1,000,000
12 Months or Longer | 900,000 | 126,300,000
Total | 131,900,000 | 127,300,000
Unrealized Losses |  |
Less Than 12 Months | (2,600,000) | 0
12 Months or Longer | (100,000) | (1,800,000)
Total | (2,700,000) | (1,800,000)
Corporate Bonds and Notes [Member] |  |
Fair Value |  |
Less Than 12 Months | 783,800,000 | 250,400,000
12 Months or Longer | 133,600,000 | 360,500,000
Total | 917,400,000 | 610,900,000
Unrealized Losses |  |
Less Than 12 Months | (26,000,000) | (5,100,000)
12 Months or Longer | (14,700,000) | (10,000,000)
Total | (40,700,000) | (15,100,000)
Redeemable Preferred Stocks [Member] |  |
Fair Value |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | 0
Total |  | 0
Unrealized Losses |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | 0
Total |  | 0
Collateralized Loan Obligations [Member] |  |
Fair Value |  |
Less Than 12 Months | 57,400,000 | 51,200,000
12 Months or Longer | 800,000 | 3,400,000
Total | 58,200,000 | 54,600,000
Unrealized Losses |  |
Less Than 12 Months | (2,900,000) | (700,000)
12 Months or Longer | (100,000) | (100,000)
Total | (3,000,000) | (800,000)
Other Mortgage and Asset-backed Securities [Member] |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 300,000 | 400,000
Total | 300,000 | 400,000
Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 0 | 0
Total | 0 | 0
Investments in Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unsettled purchases or sales of Investments in fixed maturities | 5,600,000 | 0
Other receivables |  | 0
Fair Value |  |
Less Than 12 Months | 1,028,800,000 | 327,500,000
12 Months or Longer | 159,700,000 | 546,100,000
Total | 1,188,500,000 | 873,600,000
Unrealized Losses |  |
Less Than 12 Months | (33,100,000) | (6,500,000)
12 Months or Longer | (16,900,000) | (13,200,000)
Total | (50,000,000) | (19,700,000)
Investments in Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] |  |
Unrealized Losses |  |
Total | (33,500,000) | (14,100,000)
Investments in Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] |  |
Unrealized Losses |  |
Total | $ (16,500,000) | $ (5,600,000)
Percentage of unrealized loss position to amortized cost basis of available for sale security average | 8.10% | 4.00%
Preferred Stock [Member] | Finance, Insurance and Real Estate [Member] |  |
Fair Value |  |
Less Than 12 Months | $ 2,700,000 | $ 7,500,000
12 Months or Longer | 12,300,000 | 12,100,000
Total | 15,000,000 | 19,600,000
Unrealized Losses |  |
Less Than 12 Months | 0 | (100,000)
12 Months or Longer | (800,000) | (900,000)
Total | (800,000) | (1,000,000)
Preferred Stock [Member] | All Industries Other than Finance, Insurance and Real Estate [Member] |  |
Fair Value |  |
Less Than 12 Months | 7,300,000 | 0
12 Months or Longer | 0 | 500,000
Total | 7,300,000 | 500,000
Unrealized Losses |  |
Less Than 12 Months | (800,000) | 0
12 Months or Longer | 0 | 0
Total | (800,000) | 0
Common Stock [Member] | Finance, Insurance and Real Estate [Member] |  |
Fair Value |  |
Less Than 12 Months | 16,300,000 |
12 Months or Longer | 0 |
Total | 16,300,000 |
Unrealized Losses |  |
Less Than 12 Months | (1,000,000) |
12 Months or Longer | 0 |
Total | (1,000,000) |
Common Stock [Member] | All Industries Other than Finance, Insurance and Real Estate [Member] |  |
Fair Value |  |
Less Than 12 Months | 2,800,000 |
12 Months or Longer | 0 |
Total | 2,800,000 |
Unrealized Losses |  |
Less Than 12 Months | (300,000) |
12 Months or Longer | 0 |
Total | (300,000) |
Common Stock [Member] | Manufacturing [Member] |  |
Fair Value |  |
Less Than 12 Months |  | 15,100,000
12 Months or Longer |  | 0
Total |  | 15,100,000
Unrealized Losses |  |
Less Than 12 Months |  | (1,100,000)
12 Months or Longer |  | 0
Total |  | (1,100,000)
Common Stock [Member] | All Industries Other than Manufacturing [Member] |  |
Fair Value |  |
Less Than 12 Months |  | 4,200,000
12 Months or Longer |  | 1,000,000
Total |  | 5,200,000
Unrealized Losses |  |
Less Than 12 Months |  | (400,000)
12 Months or Longer |  | 0
Total |  | (400,000)
Exchange Traded Funds [Member] |  |
Fair Value |  |
Less Than 12 Months | 135,200,000 | 14,900,000
12 Months or Longer | 0 | 14,400,000
Total | 135,200,000 | 29,300,000
Unrealized Losses |  |
Less Than 12 Months | (3,700,000) | (100,000)
12 Months or Longer | 0 | (600,000)
Total | (3,700,000) | (700,000)
Limited Liability Companies and Limited Partnerships [Member] |  |
Fair Value |  |
Less Than 12 Months | 2,700,000 | 54,400,000
12 Months or Longer | 0 | 6,600,000
Total | 2,700,000 | 61,000,000
Unrealized Losses |  |
Less Than 12 Months | (500,000) | (1,500,000)
12 Months or Longer | 0 | (300,000)
Total | (500,000) | (1,800,000)
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unsettled purchases or sales of Investments in fixed maturities | 0 | 0
Other receivables | 0 | 0
Fair Value |  |
Less Than 12 Months | 167,000,000 | 96,100,000
12 Months or Longer | 12,300,000 | 34,600,000
Total | 179,300,000 | 130,700,000
Unrealized Losses |  |
Less Than 12 Months | (6,300,000) | (3,200,000)
12 Months or Longer | (800,000) | (1,800,000)
Total | $ (7,100,000) | $ (5,000,000)

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