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Statutory Information and Dividend Limitations - Combined Net Income and Capital and Surplus (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income | $ 383.9 | $ (146.4) | $ (16.3)
Statutory capital and surplus | 2,083.4 | 1,813.4 |
Subsidiaries | Life and Health Companies |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income | (56.8) | 4.0 | 210.4
Statutory capital and surplus | 322.2 | 225.6 |
Subsidiaries | Domestic | Property and Casualty Companies |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income | 440.7 | (150.4) | (226.7)
Statutory capital and surplus | 1,761.2 | 1,587.8 |
Subsidiaries | Domestic | Life and Health Companies |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income | 17.1 | (136.0) | 174.4
Statutory capital and surplus | 124.3 | 113.7 |
Subsidiaries | Foreign | Life and Health Companies |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income | (73.9) | 140.0 | $ 36.0
Statutory capital and surplus | $ 197.9 | $ 111.9 |

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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477908/944-505-50-1 + Details
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