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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, Beginning of Period | $ 191,900,000 | $ 210,200,000 | $ 192,300,000 | $ 230,000,000.0
Included in Condensed Consolidated Statement of Operations | 2,000,000.0 | (800,000) | 1,700,000 | (900,000)
Included in Other Comprehensive Income (Loss) | (1,800,000) | 700,000 | 0 | 2,400,000
Purchases | 68,600,000 | 19,600,000 | 81,800,000 | 39,000,000.0
Sales | (14,300,000) | (28,100,000) | (18,000,000.0) | (69,300,000)
Transfers into Level 3 | 3,100,000 | 0 | 4,800,000 | 400,000
Transfers out of Level 3 | (2,800,000) | (100,000) | (15,900,000) | (100,000)
Balance, End of Period | 246,700,000 | 201,500,000 | 246,700,000 | 201,500,000
Corporate Bonds and Notes |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, Beginning of Period | 180,500,000 | 196,100,000 | 177,100,000 | 216,000,000.0
Included in Condensed Consolidated Statement of Operations | 100,000 | 100,000 | (100,000) | 500,000
Included in Other Comprehensive Income (Loss) | (1,700,000) | 900,000 | 600,000 | 2,400,000
Purchases | 59,400,000 | 18,500,000 | 72,600,000 | 37,900,000
Sales | (12,600,000) | (28,100,000) | (16,300,000) | (69,300,000)
Transfers into Level 3 | 3,100,000 | 0 | 3,100,000 | 0
Transfers out of Level 3 | (1,500,000) | (100,000) | (9,700,000) | (100,000)
Balance, End of Period | 227,300,000 | 187,400,000 | 227,300,000 | 187,400,000
States and Political Subdivisions |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, Beginning of Period | 1,400,000 |  | 100,000 |
Included in Condensed Consolidated Statement of Operations | 0 |  | 0 |
Included in Other Comprehensive Income (Loss) | 0 |  | (400,000) |
Purchases | 0 |  | 0 |
Sales | 0 |  | 0 |
Transfers into Level 3 | 0 |  | 1,700,000 |
Transfers out of Level 3 | (1,300,000) |  | (1,300,000) |
Balance, End of Period | 100,000 |  | 100,000 |
Redeemable Preferred Stocks |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, Beginning of Period | 2,200,000 | 6,800,000 | 7,100,000 | 6,800,000
Included in Condensed Consolidated Statement of Operations | 0 | 0 | 0 | 0
Included in Other Comprehensive Income (Loss) | 0 | (100,000) | 0 | (100,000)
Purchases | 1,900,000 | 0 | 1,900,000 | 0
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | (4,900,000) | 0
Balance, End of Period | 4,100,000 | 6,700,000 | 4,100,000 | 6,700,000
Collateralized Loan Obligations |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, Beginning of Period | 0 |  | 0 |
Included in Condensed Consolidated Statement of Operations | 0 |  | 0 |
Included in Other Comprehensive Income (Loss) | 0 |  | 0 |
Purchases | 6,800,000 |  | 6,800,000 |
Sales | 0 |  | 0 |
Transfers into Level 3 | 0 |  | 0 |
Transfers out of Level 3 | 0 |  | 0 |
Balance, End of Period | 6,800,000 |  | 6,800,000 |
Other Mortgage- and Asset-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, Beginning of Period | 5,100,000 | 5,300,000 | 5,200,000 | 5,100,000
Included in Condensed Consolidated Statement of Operations | 0 | 0 | 0 | 0
Included in Other Comprehensive Income (Loss) | (100,000) | (100,000) | (200,000) | 100,000
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Balance, End of Period | 5,000,000.0 | 5,200,000 | 5,000,000.0 | 5,200,000
Equity Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, Beginning of Period | 2,700,000 | 2,000,000.0 | 2,800,000 | 2,100,000
Included in Condensed Consolidated Statement of Operations | 1,900,000 | (900,000) | 1,800,000 | (1,400,000)
Included in Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0
Purchases | 500,000 | 1,100,000 | 500,000 | 1,100,000
Sales | (1,700,000) | 0 | (1,700,000) | 0
Transfers into Level 3 | 0 | 0 | 0 | 400,000
Transfers out of Level 3 | 0 | 0 | 0 | 0
Balance, End of Period | $ 3,400,000 | $ 2,200,000 | $ 3,400,000 | $ 2,200,000

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