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Fair Value of Financial Instruments - Rollforward of Instruments Measured on Recurring Basis (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Financial Assets |  |  |  |
Beginning balance | $ 371,200,000 | $ 340,200,000 | $ 371,400,000 | $ 355,100,000
Transfers into Level 3 | 73,500,000 | 31,600,000 | 145,700,000 | 58,800,000
Transfers out of Level 3 | 0 | (42,700,000) | (8,000,000.0) | (75,900,000)
Total gains or losses |  |  |  |
Net investment losses included in net income related to financial assets | (1,300,000) | 0 | (2,300,000) | 0
Net unrealized investment gains (losses) included in OCI | (10,900,000) | 4,800,000 | (24,900,000) | 1,600,000
Purchases | 4,900,000 | 0 | 4,900,000 | 0
Issuances | 0 | 0 | 0 | 0
Sales | (2,100,000) | 0 | (2,100,000) | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (15,300,000) | (9,000,000.0) | (64,700,000) | (14,700,000)
Ending balance | 420,000,000.0 | 324,900,000 | 420,000,000.0 | 324,900,000
Financial Liabilities |  |  |  |
Beginning balance | 99,100,000 | 107,600,000 | 106,600,000 | 104,500,000
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Total gains or losses |  |  |  |
Net investment (gains) losses included in net income related to financial liabilities | (4,600,000) | (3,200,000) | (9,800,000) | (7,500,000)
Net unrealized investment gains (losses) included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 1,200,000 | 1,200,000 | 2,100,000 | 1,900,000
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (2,500,000) | (3,100,000) | (5,700,000) | (5,000,000.0)
Ending balance | 93,200,000 | 108,900,000 | 93,200,000 | 108,900,000
Municipal bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 54,100,000 | 58,600,000 | 60,800,000 | 59,600,000
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | (3,200,000) | 0
Total gains or losses |  |  |  |
Net investment losses included in net income related to financial assets | 0 | 0 | 0 | 0
Net unrealized investment gains (losses) included in OCI | (2,800,000) | 300,000 | (6,200,000) | (600,000)
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (300,000) | (300,000) | (400,000) | (400,000)
Ending balance | 51,000,000.0 | 58,600,000 | 51,000,000.0 | 58,600,000
Corporate bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 226,000,000.0 | 149,100,000 | 210,300,000 | 155,800,000
Transfers into Level 3 | 56,000,000.0 | 28,500,000 | 123,400,000 | 52,600,000
Transfers out of Level 3 | 0 | (29,400,000) | 0 | (56,700,000)
Total gains or losses |  |  |  |
Net investment losses included in net income related to financial assets | 0 | 0 | 0 | 0
Net unrealized investment gains (losses) included in OCI | (4,900,000) | 3,200,000 | (11,300,000) | 1,200,000
Purchases | 4,900,000 | 0 | 4,900,000 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (11,500,000) | (900,000) | (56,800,000) | (2,400,000)
Ending balance | 270,500,000 | 150,500,000 | 270,500,000 | 150,500,000
Mortgage and Asset Backed Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 89,800,000 | 132,200,000 | 98,900,000 | 139,400,000
Transfers into Level 3 | 17,500,000 | 3,100,000 | 22,300,000 | 6,200,000
Transfers out of Level 3 | 0 | (13,300,000) | (4,800,000) | (19,200,000)
Total gains or losses |  |  |  |
Net investment losses included in net income related to financial assets | (1,400,000) | 0 | (2,300,000) | 0
Net unrealized investment gains (losses) included in OCI | (3,200,000) | 1,300,000 | (7,400,000) | 1,000,000.0
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | (2,100,000) | 0 | (2,100,000) | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (3,500,000) | (7,800,000) | (7,500,000) | (11,900,000)
Ending balance | 97,100,000 | 115,500,000 | 97,100,000 | 115,500,000
Total Fixed Maturity Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 369,900,000 | 339,900,000 | 370,000,000.0 | 354,800,000
Transfers into Level 3 | 73,500,000 | 31,600,000 | 145,700,000 | 58,800,000
Transfers out of Level 3 | 0 | (42,700,000) | (8,000,000.0) | (75,900,000)
Total gains or losses |  |  |  |
Net investment losses included in net income related to financial assets | (1,400,000) | 0 | (2,300,000) | 0
Net unrealized investment gains (losses) included in OCI | (10,900,000) | 4,800,000 | (24,900,000) | 1,600,000
Purchases | 4,900,000 | 0 | 4,900,000 | 0
Issuances | 0 | 0 | 0 | 0
Sales | (2,100,000) | 0 | (2,100,000) | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (15,300,000) | (9,000,000.0) | (64,700,000) | (14,700,000)
Ending balance | 418,600,000 | 324,600,000 | 418,600,000 | 324,600,000
Equity securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 1,300,000 | 300,000 | 1,400,000 | 300,000
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Total gains or losses |  |  |  |
Net investment losses included in net income related to financial assets | 100,000 | 0 | 0 | 0
Net unrealized investment gains (losses) included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | 0 | 0 | 0 | 0
Ending balance | $ 1,400,000 | $ 300,000 | $ 1,400,000 | $ 300,000

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