Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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The percentage of earnings allocable to participating policyholders based on earnings of such policies for payment of dividends.

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Dividend Restrictions (Details) - USD ($) $ in Millions	12 Months Ended
Dividend Restrictions (Details) - USD ($) $ in Millions	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