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Schedule II - Condensed Financial Information of Registrant - General - Additional Information (Detail) - USD ($)	1 Months Ended			12 Months Ended
	Feb. 26, 2021	Dec. 31, 2020	Feb. 29, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statutory Accounting Practices [Line Items]
Capital Contributions - UPCIC				$ 114,000,000	$ 0	$ 0
Received distributions from the earnings of subsidiaries				151,000,000.0	121,300,000	96,600,000
UPCIC [Member]
Statutory Accounting Practices [Line Items]
Capital Contributions - UPCIC		$ 114,000,000.0	$ 30,000,000
Dividend paid to immediate parent company				0	0	$ 0
UPCIC [Member] | Subsequent Event [Member]
Statutory Accounting Practices [Line Items]
Capital Contributions - UPCIC	$ 77,000,000.0
APPCIC [Member]
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company				$ 0	$ 0

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(b))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

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- Definition

The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
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+ References

No definition available.

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