This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(b))
-Publisher FASB
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- Definition

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-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
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- Definition

The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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Schedule II - Condensed Financial Information of Registrant - General - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended												12 Months Ended
	Feb. 08, 2024	Feb. 28, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company															$ 164,100,000	$ 231,900,000	$ 149,900,000
Cash dividend declared per common share (in USD per share)			$ 0.29	$ 0.16	$ 0.16	$ 0.16	$ 0.29	$ 0.16	$ 0.16	$ 0.16	$ 0.29	$ 0.16	$ 0.16	$ 0.16	$ 0.77	$ 0.77	$ 0.77
Subsequent Event
Statutory Accounting Practices [Line Items]
Cash dividend declared per common share (in USD per share)	$ 0.16
Parent Company
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries															$ 89,490,000	$ 129,490,000	$ 95,498,000
Dividend paid to immediate parent company															164,100,000	231,900,000	149,900,000
Issuance of note receivable to subsidiary															$ 0	114,000,000	20,000,000
Surplus accrued variable rate															10.54%
Parent Company \| Subsequent Event
Statutory Accounting Practices [Line Items]
Cash dividend declared per common share (in USD per share)		$ 0.16
Subordinated Surplus Debenture \| Parent Company
Statutory Accounting Practices [Line Items]
Issuance of note receivable to subsidiary															$ 134,000,000
UPCIC
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries															72,000,000	84,000,000	92,000,000
Dividend paid to immediate parent company															0	0
UPCIC \| Parent Company
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries															72,000,000	84,000,000	92,000,000
Dividend paid to immediate parent company															0	0	0
UPCIC \| Subordinated Surplus Debenture \| Parent Company
Statutory Accounting Practices [Line Items]
Issuance of note receivable to subsidiary															0	110,000,000
APPCIC
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries															0	3,000,000	0
Dividend paid to immediate parent company															0	0
APPCIC \| Parent Company
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries															0	3,000,000	$ 0
APPCIC \| Subordinated Surplus Debenture \| Parent Company
Statutory Accounting Practices [Line Items]
Issuance of note receivable to subsidiary															$ 0	$ 4,000,000