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Investments - Aging of Unrealized Losses on Investments in Fixed Maturities and Equity Securities (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Unsettled purchases or sales of Investments in fixed maturities | $ 453,700,000 | $ 453,200,000
Other receivables | 194,300,000 | 198,600,000
Fair Value |  |
Less Than 12 Months | 533,800,000 | 1,273,900,000
12 Months or Longer | 447,500,000 | 190,300,000
Total | 981,300,000 | 1,464,200,000
Unrealized Losses |  |
Less Than 12 Months | (8,100,000) | (40,500,000)
12 Months or Longer | (17,800,000) | (11,600,000)
Total | (25,900,000) | (52,100,000)
Unrealized losses related to securities for which the Company has recognized credit losses in earnings | 0 | 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 | 0 | 0
US Government and Government Agencies and Authorities [Member] |  |
Fair Value |  |
Less Than 12 Months | 140,000,000 | 117,700,000
12 Months or Longer | 103,400,000 | 1,100,000
Total | 243,400,000 | 118,800,000
Unrealized Losses |  |
Less Than 12 Months | (1,100,000) | (7,200,000)
12 Months or Longer | (5,100,000) | 0
Total | (6,200,000) | (7,200,000)
States and Political Subdivisions [Member] |  |
Fair Value |  |
Less Than 12 Months | 57,000,000 | 432,700,000
12 Months or Longer | 124,200,000 | 300,000
Total | 181,200,000 | 433,000,000
Unrealized Losses |  |
Less Than 12 Months | (300,000) | (14,100,000)
12 Months or Longer | (2,000,000) | 0
Total | (2,300,000) | (14,100,000)
Foreign Government Debt Securities [Member] |  |
Fair Value |  |
Less Than 12 Months |  | 2,100,000
12 Months or Longer |  | 0
Total |  | 2,100,000
Unrealized Losses |  |
Less Than 12 Months |  | (100,000)
12 Months or Longer |  | 0
Total |  | (100,000)
Corporate Bonds and Notes [Member] |  |
Fair Value |  |
Less Than 12 Months | 283,100,000 | 663,300,000
12 Months or Longer | 208,900,000 | 107,300,000
Total | 492,000,000 | 770,600,000
Unrealized Losses |  |
Less Than 12 Months | (4,200,000) | (16,600,000)
12 Months or Longer | (6,800,000) | (7,400,000)
Total | (11,000,000) | (24,000,000)
Collateralized Loan Obligations [Member] |  |
Fair Value |  |
Less Than 12 Months | 2,800,000 | 19,900,000
12 Months or Longer | 2,400,000 | 21,400,000
Total | 5,200,000 | 41,300,000
Unrealized Losses |  |
Less Than 12 Months | 0 | (700,000)
12 Months or Longer | 0 | (400,000)
Total | 0 | (1,100,000)
Investments in Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unsettled purchases or sales of Investments in fixed maturities | 5,400,000 | 100,000
Other receivables | 0 | 2,700,000
Fair Value |  |
Less Than 12 Months | 482,900,000 | 1,235,700,000
12 Months or Longer | 438,900,000 | 130,100,000
Total | 921,800,000 | 1,365,800,000
Unrealized Losses |  |
Less Than 12 Months | (5,600,000) | (38,700,000)
12 Months or Longer | (13,900,000) | (7,800,000)
Total | (19,500,000) | (46,500,000)
Investments in Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] |  |
Unrealized Losses |  |
Total | 12,600,000 | (33,800,000)
Investments in Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] |  |
Unrealized Losses |  |
Total | $ 6,900,000 | $ (12,700,000)
Percentage of unrealized loss position to amortized cost basis of available for sale security average | 4.00% | 5.00%
Preferred Stock [Member] | Finance, Insurance and Real Estate [Member] |  |
Fair Value |  |
Less Than 12 Months | $ 300,000 | $ 15,600,000
12 Months or Longer | 200,000 | 7,300,000
Total | 500,000 | 22,900,000
Unrealized Losses |  |
Less Than 12 Months | 0 | (500,000)
12 Months or Longer | 0 | (300,000)
Total | 0 | (800,000)
Preferred Stock [Member] | All Industries Other than Finance, Insurance and Real Estate [Member] |  |
Fair Value |  |
Less Than 12 Months | 200,000 | 5,300,000
12 Months or Longer | 200,000 | 0
Total | 400,000 | 5,300,000
Unrealized Losses |  |
Less Than 12 Months | 0 | (500,000)
12 Months or Longer | 0 | 0
Total | 0 | (500,000)
Common Stock [Member] | Finance, Insurance and Real Estate [Member] |  |
Fair Value |  |
Less Than 12 Months | 1,600,000 | 2,800,000
12 Months or Longer | 0 | 0
Total | 1,600,000 | 2,800,000
Unrealized Losses |  |
Less Than 12 Months | (100,000) | 0
12 Months or Longer | 0 | 0
Total | (100,000) | 0
Common Stock [Member] | All Industries Other than Finance, Insurance and Real Estate [Member] |  |
Fair Value |  |
Less Than 12 Months | 400,000 | 600,000
12 Months or Longer | 500,000 | 500,000
Total | 900,000 | 1,100,000
Unrealized Losses |  |
Less Than 12 Months | (300,000) | (100,000)
12 Months or Longer | (100,000) | 0
Total | (400,000) | (100,000)
Exchange Traded Funds [Member] |  |
Fair Value |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | 18,600,000
Total |  | 18,600,000
Unrealized Losses |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | (1,300,000)
Total |  | (1,300,000)
Limited Liability Companies and Limited Partnerships [Member] |  |
Fair Value |  |
Less Than 12 Months | 48,400,000 | 13,900,000
12 Months or Longer | 7,700,000 | 33,800,000
Total | 56,100,000 | 47,700,000
Unrealized Losses |  |
Less Than 12 Months | (2,100,000) | (700,000)
12 Months or Longer | (3,800,000) | (2,200,000)
Total | (5,900,000) | (2,900,000)
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unsettled purchases or sales of Investments in fixed maturities | 0 |
Other receivables | 0 | 200,000
Fair Value |  |
Less Than 12 Months | 50,900,000 | 38,200,000
12 Months or Longer | 8,600,000 | 60,200,000
Total | 59,500,000 | 98,400,000
Unrealized Losses |  |
Less Than 12 Months | (2,500,000) | (1,800,000)
12 Months or Longer | (3,900,000) | (3,800,000)
Total | $ (6,400,000) | $ (5,600,000)

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