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Investments - Aging of Unrealized Losses on Investments in Fixed Maturities and Equity Securities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Unrealized Losses |  |
Unrealized losses related to securities for which the Company has recognized credit losses in earnings | $ 0 | $ 0
Unsettled purchases or sales of Investments in fixed maturities | 697,300,000 | 453,700,000
Other receivables | 245,400,000 | 194,300,000
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 | 401,100,000 | 140,000,000
12 Months or Longer | $ 79,000,000 | $ 103,400,000
Total | 480,100,000 | 243,400,000
Unrealized Losses |  |
Less Than 12 Months | (7,600,000) | (1,100,000)
12 Months or Longer | (7,400,000) | (5,100,000)
Total | $ (15,000,000) | $ (6,200,000)
States and Political Subdivisions [Member] |  |
Fair Value |  |
Less Than 12 Months | 299,400,000 | 57,000,000
12 Months or Longer | $ 102,600,000 | $ 124,200,000
Total | 402,000,000 | 181,200,000
Unrealized Losses |  |
Less Than 12 Months | (5,000,000) | (300,000)
12 Months or Longer | (3,600,000) | (2,000,000)
Total | $ (8,600,000) | $ (2,300,000)
Debt Security, Government, Non-US [Member] |  |
Fair Value |  |
Less Than 12 Months | 4,900,000 |
12 Months or Longer | $ 0 |
Total | 4,900,000 |
Unrealized Losses |  |
Less Than 12 Months | (600,000) |
12 Months or Longer | 0 |
Total | $ (600,000) |
Corporate Bonds and Notes [Member] |  |
Fair Value |  |
Less Than 12 Months | 1,326,000,000 | 283,100,000
12 Months or Longer | $ 116,800,000 | $ 208,900,000
Total | 1,442,800,000 | 492,000,000
Unrealized Losses |  |
Less Than 12 Months | (38,200,000) | (4,200,000)
12 Months or Longer | (10,900,000) | (6,800,000)
Total | $ (49,100,000) | $ (11,000,000)
Collateralized Loan Obligations [Member] |  |
Fair Value |  |
Less Than 12 Months | 439,200,000 | 2,800,000
12 Months or Longer | $ 0 | $ 2,400,000
Total | 439,200,000 | 5,200,000
Unrealized Losses |  |
Less Than 12 Months | (13,200,000) | 0
12 Months or Longer | 0 | 0
Total | $ (13,200,000) | $ 0
Other Mortgage and Asset-backed Securities [Member] |  |
Fair Value |  |
Less Than 12 Months | 200,000 |
12 Months or Longer | $ 4,500,000 |
Total | 4,700,000 |
Unrealized Losses |  |
Less Than 12 Months | 0 |
12 Months or Longer | (100,000) |
Total | $ (100,000) |
Investments in Fixed Maturities [Member] |  |
Fair Value |  |
Less Than 12 Months | 2,470,800,000 | 482,900,000
12 Months or Longer | $ 302,900,000 | $ 438,900,000
Total | 2,773,700,000 | 921,800,000
Unrealized Losses |  |
Less Than 12 Months | (64,600,000) | (5,600,000)
12 Months or Longer | (22,000,000) | (13,900,000)
Total | (86,600,000) | (19,500,000)
Unsettled purchases or sales of Investments in fixed maturities | 10,500,000 | 5,400,000
Other receivables | $ 500,000 | $ 0
Investments in Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] |  |
Unrealized Losses |  |
Percentage of unrealized loss position to amortized cost basis of available for sale security average | 5.00% | 4.00%
Equity Securities [Member] |  |
Unrealized Losses |  |
Unsettled purchases or sales of Investments in fixed maturities | $ 0 |
Other receivables | $ 0 |

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