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INSURANCE OPERATIONS - Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 28, 2025	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
UPCIC
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company		0	0
Capital contribution to subsidiaries		44,000,000.0	72,000,000.0	84,000,000.0
UPCIC | Subsequent Event
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries	$ 12,100,000
APPCIC
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company		0	0
Capital contribution to subsidiaries		$ 0	$ 0	$ 3,000,000.0
UPCIC and APPCIC
Statutory Accounting Practices [Line Items]
Minimum capitalization rate		10.00%
UPCIC and APPCIC | Minimum
Statutory Accounting Practices [Line Items]
Minimum capitalization amount		$ 15,000,000

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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- Definition

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
-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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- Definition

Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477908/944-505-50-1

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- Definition

Capital Contribution To Subsidiaries

+ References

No definition available.

+ Details

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- Definition

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+ References

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