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Dividend Restrictions (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Nov. 30, 2026 | May 31, 2026 | Jan. 01, 2026
NEW HAMPSHIRE [Member] |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Percentage of policyholder's surplus distributes as dividends and other distributions | 10.00% |  |  |  |  |
Dividends declared | $ 295.0 | $ 100.0 | $ 100.0 |  |  |
Dividends paid to parent | $ 295.0 | 100.0 | 100.0 |  |  |
NEW HAMPSHIRE [Member] | Scenario Forecast [Member] |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Statutory amount available for dividend payments |  |  |  | $ 332.8 | $ 187.8 |
NEW HAMPSHIRE [Member] | Maximum [Member] | Scenario Forecast [Member] |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Maximum dividends payable without prior approval of state regulators |  |  |  | 145.0 | $ 150.0 |
NEW HAMPSHIRE [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Maximum dividends payable without prior approval of state regulators |  |  |  |  |  | $ 37.8
MICHIGAN [Member] |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Percentage of policyholder's surplus distributes as dividends and other distributions | 10.00% |  |  |  |  |
Dividends declared | $ 91.0 | 59.0 | 10.0 |  |  |
Dividends paid to parent | $ 91.0 | $ 59.0 | $ 10.0 |  |  |
MICHIGAN [Member] | Scenario Forecast [Member] |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Statutory amount available for dividend payments |  |  |  | 142.9 |  |
MICHIGAN [Member] | Maximum [Member] | Scenario Forecast [Member] |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Maximum dividends payable without prior approval of state regulators |  |  |  | $ 91.0 |  |
MICHIGAN [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Maximum dividends payable without prior approval of state regulators |  |  |  |  |  | $ 51.9

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