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SCHEDULE II - CONDENSED FINANCIAL INFORMATION REGISTRANT - Narrative (Details) - USD ($)		1 Months Ended	3 Months Ended												12 Months Ended
	Feb. 06, 2025	Feb. 28, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 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, 2024	Dec. 31, 2023	Dec. 31, 2022
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company															$ 94,400,000	$ 164,100,000	$ 231,900,000
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
UPCIC
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries															$ 44,000,000.0	$ 72,000,000.0	$ 84,000,000.0
Dividend paid to immediate parent company															0	0
UPCIC | Subsequent Event
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries		$ 12,100,000
APPCIC
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries															0	0	3,000,000.0
Dividend paid to immediate parent company															0	0
Parent Company
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries															61,985,000	89,490,000	129,490,000
Dividend paid to immediate parent company															94,400,000	164,100,000	231,900,000
Issuance of note receivable to subsidiary															$ 0	0	114,000,000
Surplus accrued variable rate															10.70%
Parent Company | Subsequent Event
Statutory Accounting Practices [Line Items]
Cash dividend declared per common share (in USD per share)	$ 0.16
Parent Company | Subordinated Surplus Debenture
Statutory Accounting Practices [Line Items]
Issuance of note receivable to subsidiary															$ 134,000,000
Parent Company | UPCIC
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries															44,000,000	72,000,000	84,000,000
Dividend paid to immediate parent company															0	0	0
Parent Company | UPCIC | Subordinated Surplus Debenture
Statutory Accounting Practices [Line Items]
Issuance of note receivable to subsidiary															0	0	110,000,000
Parent Company | APPCIC
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries															0	0	3,000,000
Dividend paid to immediate parent company															0	0	0
Parent Company | APPCIC | Subordinated Surplus Debenture
Statutory Accounting Practices [Line Items]
Issuance of note receivable to subsidiary															$ 0	$ 0	$ 4,000,000

X

- Definition

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

+ References

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
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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/1943274/2147478777/944-210-S99-1

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