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Statutory Insurance Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statutory disclosures
Statutory reserves assumed by affiliated reinsurance subsidiaries	$ 18,474.2	$ 17,815.1
Admitted assets under prescribed and permitted statutory accounting practices	4,153.8	3,748.4
Statutory net income (loss)	1,285.0	(1,563.1)	$ 864.0
Statutory capital and surplus	4,753.4	4,304.4	$ 5,375.2
Insurance ceded out of ULSG reserves by affiliated reinsurance subsidiaries	$ 10,406.3	$ 9,956.9

X

- Definition

Amount as of the balance sheet date of assets admitted due to applying state prescribed and permitted statutory accounting practices rather than statutory accounting practices prescribed by the National Association of Insurance Commissioners.

+ References

No definition available.

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- Definition

Amount of insurance ceded out of ULSG reserves by affiliated reinsurance subsidiaries in Vermont.

+ References

No definition available.

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- Definition

Amount of statutory reserves assumed by affiliated reinsurance subsidiaries.

+ References

No definition available.

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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//1943274/2147479440/944-210-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//1943274/2147479989/944-505-50-1

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- Definition

Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

+ 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//1943274/2147479440/944-210-S99-1

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