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Valuation Allowance of Deferred Tax Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 264.1	$ 203.6	$ 60.4
Additions	67.0	69.1	144.2
Deductions	(5.3)	(4.3)	(1.0)
Currency translation	(0.3)	(4.3)
Ending Balance	326.1	264.1	203.6
CUSA [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	240.9	203.6	60.4
Additions	47.0	52.5	144.2
Deductions	(4.9)	(10.9)	(1.0)
Currency translation	(0.2)	(4.3)
Ending Balance	$ 283.2	$ 240.9	$ 203.6

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- Definition

Valuation allowances and reserves additions.

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- Definition

Amount of gain (loss) from converting allowance reserve for credit loss to currency of reporting entity from amount denominated or measured in a different currency, which decreases (increases) the allowance for loan and lease losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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- Definition

Amount of valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column B))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column E))
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Amount of decrease in valuation and qualifying accounts and reserves.

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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column D))
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