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v3.19.1

Investments - Narrative (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ 63,400,000 |  |
Other Receivables | 254,600,000 | $ 245,400,000 |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,178,100,000 |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,179,600,000 |  |
Other Liabilities | 742,700,000 | 687,300,000 |
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
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
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount | 200,000 |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount |  | 5.1 |
Investments in Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less Than 12 Months | 648,400,000 | 2,470,800,000 |
Total | 34,600,000 | 86,600,000 |
12 Months or Longer | 22,400,000 | 22,000,000.0 |
Other Liabilities | 15,500,000 | 10,500,000 |
Less Than 12 Months | 12,200,000 | 64,600,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 695,200,000 | 302,900,000 |
12 Months or Longer | 22,400,000 | 22,000,000.0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,343,600,000 | 2,773,700,000 |
Total | 34,600,000 | 86,600,000 |
U.S. Government and Government Agencies and Authorities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less Than 12 Months | 13,200,000 | 401,100,000 |
Less Than 12 Months | 200,000 | 7,600,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 262,200,000 | 79,000,000.0 |
12 Months or Longer | 7,500,000 | 7,400,000 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 275,400,000 | 480,100,000 |
Total | 7,700,000 | 15,000,000.0 |
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 616,400,000 |  |
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 8,100,000 |  |
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 7,600,000 |  |
Other Non-Governmental Issuers [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 547,500,000 |  |
Equity Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Other Receivables | 0 | 0 |
Other Liabilities |  | 0 |
External Credit Rating, Investment Grade [Member] | Investments in Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total | 23,100,000 | 69,500,000 |
External Credit Rating, Non Investment Grade [Member] | Investments in Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total | $ 11,500,000 | $ 17,100,000 |
Percentage of Unrealized Loss Position to Amortized Cost Basis of Available for Sale Security Average | 4.00% |  | 5.00%

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