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Earnings Per Share - Computation of Basic and Diluted Net EPS (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net earnings attributable to controlling interests	$ 225.1	$ 176.6	$ 797.4	$ 676.6
Weighted average number of common shares outstanding	207.0	191.9	201.0	190.4
Dilutive effect of stock options using the treasury stock method	4.5	4.4	4.5	4.1
Weighted average number of common and common equivalent shares outstanding	211.5	196.3	205.5	194.5
Basic net earnings per share	$ 1.09	$ 0.92	$ 3.97	$ 3.55
Diluted net earnings per share	$ 1.06	$ 0.90	$ 3.88	$ 3.48

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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