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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Income Statement [Abstract]
Total revenues	$ 1,657.4	$ 1,778.5	$ 1,660.4	$ 1,837.7	$ 1,519.4	$ 1,593.7	$ 1,489.5	$ 1,646.4
Total expenses	1,614.2	1,688.2	1,556.8	1,595.4	1,490.2	1,516.8	1,435.4	1,446.8
Earnings before income taxes	43.2	90.3	103.6	242.3	29.2	76.9	54.1	199.6	$ 479.4	$ 359.8		$ 333.6
Net earnings attributable to controlling interests	$ 117.3	$ 127.6	$ 114.9	$ 273.7	$ 71.5	$ 111.0	$ 70.0	$ 228.8	$ 633.5	$ 481.3	[1]	$ 396.8	[1]
Basic net earnings per share	$ 0.64	$ 0.70	$ 0.63	$ 1.51	$ 0.39	$ 0.61	$ 0.39	$ 1.28
Diluted net earnings per share	$ 0.63	$ 0.68	$ 0.62	$ 1.48	$ 0.39	$ 0.61	$ 0.39	$ 1.27
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.

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