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Investments - Schedule of Fixed Maturities (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | $ 6,667,300,000 | $ 6,372,700,000
Gross unrealized gains | 515,700,000 |
Gross unrealized loss | (179,900,000) |
Fixed maturities, allowance for credit losses | (4,600,000) | 0
Fixed maturities at fair value | 6,998,500,000 | 6,922,100,000
Investments in Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities |  | 6,372,700,000
Gross unrealized gains |  | 570,200,000
Gross unrealized loss |  | (20,800,000)
Fixed maturities at fair value |  | 6,922,100,000
U.S. Government and Government Agencies and Authorities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 700,300,000 | 784,700,000
Gross unrealized gains | 60,300,000 | 32,500,000
Gross unrealized loss | 0 | (1,300,000)
Fixed maturities, allowance for credit losses | 0 |
Fixed maturities at fair value | 760,600,000 | 815,900,000
States and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 1,400,100,000 | 1,386,400,000
Gross unrealized gains | 133,000,000.0 | 130,500,000
Gross unrealized loss | (4,100,000) | (1,100,000)
Fixed maturities, allowance for credit losses | 0 |
Fixed maturities at fair value | 1,529,000,000.0 | 1,515,800,000
Foreign Governments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 7,300,000 | 17,200,000
Gross unrealized gains | 0 | 1,200,000
Gross unrealized loss | (1,200,000) | (1,600,000)
Fixed maturities, allowance for credit losses | (1,100,000) | 0
Fixed maturities at fair value | 5,000,000.0 | 16,800,000
Bonds and Notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 3,697,700,000 | 3,465,000,000.0
Gross unrealized gains | 314,400,000 | 401,800,000
Gross unrealized loss | (74,600,000) | (7,100,000)
Fixed maturities, allowance for credit losses | (3,500,000) | 0
Fixed maturities at fair value | 3,934,000,000.0 | 3,859,700,000
Redeemable Preferred Stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 6,800,000 | 6,800,000
Gross unrealized gains | 0 | 0
Gross unrealized loss | (100,000) | (100,000)
Fixed maturities, allowance for credit losses | 0 |
Fixed maturities at fair value | 6,700,000 | 6,700,000
Collateralized Loan Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 684,500,000 | 624,600,000
Gross unrealized gains | 800,000 | 2,100,000
Gross unrealized loss | (91,800,000) | (8,500,000)
Fixed maturities, allowance for credit losses | 0 |
Fixed maturities at fair value | 593,500,000 | 618,200,000
Other Mortgage- and Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 170,600,000 | 88,000,000.0
Gross unrealized gains | 7,200,000 | 2,100,000
Gross unrealized loss | (8,100,000) | (1,100,000)
Fixed maturities, allowance for credit losses | 0 |
Fixed maturities at fair value | $ 169,700,000 | $ 89,000,000.0

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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