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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Total Losses: |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 197,600,000 | $ 233,200,000 | $ 197,600,000 | $ 233,200,000 | $ 201,500,000 | $ 230,000,000.0 | $ 191,300,000 | $ 251,400,000
Included in Condensed Consolidated Statement of Operations | 1,700,000 | (6,300,000) | 800,000 | (12,200,000) |  |  |  |
Included in Other Comprehensive Income (Loss) | (2,700,000) | (3,300,000) | (300,000) | (15,100,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 6,200,000 | 96,200,000 | 45,200,000 | 119,800,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | 0 | 0 | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (14,100,000) | (62,300,000) | (83,400,000) | (127,900,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 5,000,000.0 | 17,600,000 | 5,400,000 | 22,900,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 | 0 | (100,000) | (5,700,000) |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |
Total Losses: |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 182,400,000 | 218,700,000 | 182,400,000 | 218,700,000 | 187,400,000 | 216,000,000.0 | 177,100,000 | 236,800,000
Included in Condensed Consolidated Statement of Operations | 200,000 | (6,300,000) | 700,000 | (12,200,000) |  |  |  |
Included in Other Comprehensive Income (Loss) | (2,200,000) | (2,800,000) | 200,000 | (12,200,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 6,100,000 | 93,500,000 | 44,000,000.0 | 115,100,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | 0 | 0 | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (14,100,000) | (60,400,000) | (83,400,000) | (126,000,000.0) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 5,000,000.0 | 17,600,000 | 5,000,000.0 | 22,900,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 | 0 | (100,000) | (5,700,000) |  |  |  |
States and Political Subdivisions |  |  |  |  |  |  |  |
Total Losses: |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 100,000 |  | 100,000 |  |  | 0 |  |
Included in Condensed Consolidated Statement of Operations | 0 |  | 0 |  |  |  |  |
Included in Other Comprehensive Income (Loss) | 0 |  | 0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 100,000 |  | 100,000 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 |  | 0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 |  | 0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 |  | 0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 |  | 0 |  |  |  |  |
Redeemable Preferred Stocks |  |  |  |  |  |  |  |
Total Losses: |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 6,600,000 | 6,800,000 | 6,600,000 | 6,800,000 | 6,700,000 | 6,800,000 | 6,900,000 | 6,100,000
Included in Condensed Consolidated Statement of Operations | 0 | 0 | 0 | 0 |  |  |  |
Included in Other Comprehensive Income (Loss) | (100,000) | (100,000) | (200,000) | (1,300,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | 0 | 0 | 2,000,000.0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | 0 | 0 | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | 0 | 0 | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 0 | 0 | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | 0 | 0 | 0 |  |  |  |
Other Mortgage- and Asset-backed |  |  |  |  |  |  |  |
Total Losses: |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 4,800,000 | 5,200,000 | 4,800,000 | 5,200,000 | 5,200,000 | 5,100,000 | 5,600,000 | 7,000,000.0
Included in Condensed Consolidated Statement of Operations | 0 | 0 | 0 | 0 |  |  |  |
Included in Other Comprehensive Income (Loss) | (400,000) | (400,000) | (300,000) | (1,800,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | 0 | 0 | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | 0 | 0 | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | 0 | 0 | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 | 0 | 0 | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 | 0 | 0 | 0 |  |  |  |
Equity Securities |  |  |  |  |  |  |  |
Total Losses: |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 3,700,000 | 2,500,000 | 3,700,000 | 2,500,000 | $ 2,200,000 | $ 2,100,000 | $ 1,700,000 | $ 1,500,000
Included in Condensed Consolidated Statement of Operations | 1,500,000 | 0 | 100,000 | 0 |  |  |  |
Included in Other Comprehensive Income (Loss) | 0 | 0 | 0 | 200,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | 2,700,000 | 1,100,000 | 2,700,000 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | 0 | 0 | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | (1,900,000) | 0 | (1,900,000) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 | $ 0 | 400,000 | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | $ 0 |  | $ 0 | $ 0 |  |  |  |

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