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Investments - Held-to-maturity Security - Narrative (Details)	6 Months Ended
	Jun. 30, 2022 USD ($)
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity debt security estimated unrealized holding loss	$ 37,200,000
Held-to-maturity debt security Credit losses	$ 0
LLC Note [Member]
Schedule Of Held To Maturity Securities [Line Items]
Debt instrument, maturity date	Dec. 31, 2030
Debt instrument, interest rate, stated percentage	4.50%
Surplus Note [Member]
Schedule Of Held To Maturity Securities [Line Items]
Debt instrument, maturity date	Dec. 31, 2030
Debt instrument, interest rate, stated percentage	4.50%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
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-Name Accounting Standards Codification
-Topic 820
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-Section 50
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Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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Amount of unrealized gain (loss) from transfer of investment in debt security measured at amortized cost (held-to-maturity), to investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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