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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Total revenues	$ 1,599.0	$ 1,584.5	$ 1,563.4	$ 1,412.7	$ 1,385.0	$ 1,482.3	$ 1,427.1	$ 1,300.4	$ 6,159.6	$ 5,594.8	$ 5,392.4
Total expenses	1,516.9	1,487.8	1,416.4	1,360.4	1,316.2	1,387.4	1,289.6	1,244.7
Earnings before income taxes	82.1	96.7	147.0	52.3	68.8	94.9	137.5	55.7	378.1	356.9	293.5
Net earnings attributable to controlling interests	$ 105.1	$ 130.4	$ 171.9	$ 55.7	$ 95.1	$ 122.8	$ 150.0	$ 46.5	$ 463.1	$ 414.4	$ 356.8
Basic net earnings per share	$ 0.58	$ 0.72	$ 0.96	$ 0.31	$ 0.53	$ 0.69	$ 0.85	$ 0.26
Diluted net earnings per share	$ 0.57	$ 0.71	$ 0.95	$ 0.31	$ 0.53	$ 0.69	$ 0.84	$ 0.26

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