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Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Foreign Currency Translation Adjustments Attributable to Non-controlling Interests [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation attributable to non-controlling interests		$ 29.0	$ 23.0
Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net other comprehensive income loss after tax in respect of acturial benefits	[1]		(1.0)
Benefit Plans [Member] | Maximum [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net other comprehensive income loss after tax in respect of acturial benefits			$ 0.5
[1] Amounts do not include a $23 million gain from foreign currency translation adjustments attributable to non-controlling interests.

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