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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 1,563.4	$ 1,427.1	$ 2,976.1	$ 2,727.5
Earnings before income taxes	147.0	137.5	199.3	193.2
Identifiable assets at June 30, 2017 and 2016	12,569.6		12,569.6		$ 11,489.6
Operating Segments [Member] | Brokerage [Member]
Segment Reporting Information [Line Items]
Total revenues	998.1	939.1	1,876.6	1,764.6
Earnings before income taxes	212.5	178.2	330.2	278.2
Identifiable assets at June 30, 2017 and 2016	10,052.4	9,225.9	10,052.4	9,225.9
Operating Segments [Member] | Risk Management [Member]
Segment Reporting Information [Line Items]
Total revenues	188.7	176.5	371.3	355.8
Earnings before income taxes	22.9	22.4	45.8	46.4
Identifiable assets at June 30, 2017 and 2016	707.7	663.5	707.7	663.5
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Total revenues	376.6	311.5	728.2	607.1
Earnings before income taxes	(88.4)	(63.1)	(176.7)	(131.4)
Identifiable assets at June 30, 2017 and 2016	$ 1,809.5	$ 1,494.9	$ 1,809.5	$ 1,494.9

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