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Income Taxes - Reconciliation Between Income Tax Expenses (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Income Taxes [Line Items]
Benefit of rate differential on earnings	$ 123.0
Tax losses with investment in foreign subsidiaries and write down of intercompany receivables of foreign subsidiaries	135.6
Tax charge for remeasurement of deferred taxes and tax attributes	49.9
Tax Credit, Foreign	21.2
CUSA
Income Taxes [Line Items]
Benefit of rate differential on earnings	120.7
Tax losses with investment in foreign subsidiaries and write down of intercompany receivables of foreign subsidiaries	135.6
Tax charge for remeasurement of deferred taxes and tax attributes	49.9
Tax Credit, Foreign	$ 21.2

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Covid nineteen pandemic expense benefit of rate differential on earnings.

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- Definition

Covid nineteen pandemic tax charge for remeasurement of deferred tax and tax attributes.

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- Definition

Covid nineteen pandemic tax losses with foreign subsidiaries investment and write down of intercompany receivables of foreign subsidiaries.

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Income Taxes [Line Items]

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign tax credit.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

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