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Accumulated Other Comprehensive Earnings - Schedule of Accumulated Other Comprehensive Earnings (Loss) Attributable to Controlling Interests (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ (759.6)
Ending Balance	(643.6)	$ (759.6)
Pension Liability [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(56.5)	(61.2)	$ (43.0)
Reclassification to retained earnings of income tax effects related to the TCJA			(7.9)
Net change in period	0.4	4.7	(10.3)
Ending Balance	(56.1)	(56.5)	(61.2)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(674.8)	(719.0)	(521.3)
Net change in period	183.7	44.2	(197.7)
Ending Balance	(491.1)	(674.8)	(719.0)
Fair Value of Derivative Investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(28.3)	(5.4)	8.9
Reclassification to retained earnings of income tax effects related to the TCJA			1.3
Net change in period	(68.1)	(22.7)	(15.6)
Ending Balance	(96.4)	(28.3)	(5.4)
Fair Value of Derivative Investments [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(0.2)
Ending Balance			(0.2)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(759.6)	(785.6)	(555.4)
Reclassification to retained earnings of income tax effects related to the TCJA			(6.6)
Net change in period	116.0	26.2	(223.6)
Ending Balance	$ (643.6)	(759.6)	(785.6)
Accumulated Other Comprehensive Loss [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ (0.2)
Ending Balance			$ (0.2)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount of increase (decrease) in other comprehensive income, after tax, from changes classified as other.

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Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act.

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