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Quarterly Operating Results (unaudited) - Quarterly Operating Results (Detail) - USD ($)
$ / shares in Units, $ 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
Income Statement [Abstract]                      
Total revenues $ 1,703.6 $ 1,849.1 $ 1,584.0 $ 1,866.9 $ 1,721.4 $ 1,825.2 $ 1,657.8 $ 1,990.6 $ 7,003.6 $ 7,195.0 $ 6,934.0
Total expenses 1,569.9 1,639.6 1,412.3 1,510.9 1,637.4 1,710.4 1,552.3 1,668.8 6,132.7 6,568.9 6,454.6
Earnings before income taxes 133.7 209.5 171.7 356.0 84.0 114.8 105.5 321.8 870.9 626.1 479.4
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
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