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Investments - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |
Other Receivables | $ 207,800,000 | $ 219,700,000
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,343,300,000 |
Debt securities, available-for-sale, continuous unrealized loss position, less than twelve months, securities that have had recognized credit losses in earnings, aggregate losses |  | 300,000
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, securities that have had recognized credit losses in earnings, aggregate losses |  | 0
Fixed maturities, allowance for credit losses | 4,600,000 | 0
Equity Securities at Fair Value (Cost: 2020 - $698.0; 2019 - $818.8) | 709,800,000 | 907,300,000
Equity securities, FV-NI, unrealized gain (loss) | (112,800,000) |
Equity securities without readily determinable fair value, impairment loss, annual amount | 2,000,000.0 |
Equity securities without readily determinable fair value, downward price adjustment, cumulative amount | 500,000 |
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount | 0 |
Equity securities without readily determinable fair value, impairment loss, cumulative amount | 5,000,000.0 |
Equity Method Limited Liability Investments at Cost Plus Cumulative Undistributed Earnings | 226,300,000 | 220,400,000
Outstanding commitments to fund equity method limited liability investments | 89,500,000 |
Investments in Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other Receivables | 7,700,000 | 1,000,000.0
Other liabilities | 76,200,000 | 19,500,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 179,900,000 | 20,800,000
12 Months or Longer | 47,600,000 | 13,300,000
Government National Mortgage Association Certificates and Obligations (GNMA) |  |
Debt Securities, Available-for-sale [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 561,400,000 |
Federal National Mortgage Association Certificates and Obligations (FNMA) |  |
Debt Securities, Available-for-sale [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 6,800,000 |
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |
Debt Securities, Available-for-sale [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 13,300,000 |
Other Non-Governmental Issuers |  |
Debt Securities, Available-for-sale [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 761,800,000 |
Equity Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other Receivables | 0 | 0
Other liabilities | 0 | 0
Investment-grade | Investments in Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 110,700,000 | 9,100,000
Non-investment-grade | Investments in Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | $ 69,200,000 | $ 11,700,000
Percentage of unrealized loss position to amortized cost basis of available for sale security average | 17.00% | 5.00%

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