Earnings Per Share - Computation of Basic and Diluted Net EPS (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net earnings attributable to controlling interests	$ 98.5	$ 126.1	$ 110.1	$ 334.1	$ 117.3	$ 127.6	$ 114.9	$ 273.7	$ 668.8	$ 633.5	$ 481.3	[1]
Weighted average number of common shares outstanding									186.0	182.7	180.1
Dilutive effect of stock options using the treasury stock method									4.1	3.5	2.0
Weighted average number of common and common equivalent shares outstanding									190.1	186.2	182.1
Basic net earnings per share									$ 3.60	$ 3.47	$ 2.67	[1]
Diluted net earnings per share									$ 3.52	$ 3.40	$ 2.64	[1]

[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.