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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 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                      
Net earnings attributable to controlling interests $ 142.2 $ 176.6 $ 153.7 $ 346.3 $ 98.5 $ 126.1 $ 110.1 $ 334.1 $ 818.8 $ 668.8 $ 633.5
Weighted average number of common shares outstanding                 191.0 186.0 182.7
Dilutive effect of stock options using the treasury stock method                 4.0 4.1 3.5
Weighted average number of common and common equivalent shares outstanding                 195.0 190.1 186.2
Basic net earnings per share $ 0.74 $ 0.92 $ 0.81 $ 1.83 $ 0.53 $ 0.68 $ 0.59 $ 1.81 $ 4.29 $ 3.60 $ 3.47
Diluted net earnings per share $ 0.72 $ 0.90 $ 0.79 $ 1.79 $ 0.51 $ 0.66 $ 0.58 $ 1.77 $ 4.20 $ 3.52 $ 3.40