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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues before reimbursements	$ 8,420.1	$ 8,076.4	$ 6,851.9
Reimbursements	130.5	133.0	151.7
Total revenues	8,550.6	8,209.4	7,003.6
Compensation	4,799.8	3,927.5	3,466.5
Operating	1,330.9	1,072.4	906.5
Reimbursements	130.5	133.0	151.7
Cost of revenues from clean coal activities	22.9	1,173.2	882.1
Interest	256.9	226.1	196.4
Loss on extinguishment of debt		16.2
Depreciation	144.7	151.2	145.1
Amortization	454.9	415.1	417.3
Change in estimated acquisition earnout payables	83.0	119.6	(32.9)
Total expenses	7,223.6	7,234.3	6,132.7
Earnings before income taxes	1,327.0	975.1	870.9
Provision (benefit) for income taxes	211.0	20.1	12.8
Net earnings	1,116.0	955.0	858.1
Net earnings attributable to noncontrolling interests	1.8	48.2	39.3
Net earnings attributable to controlling interests	1,114.2	906.8	818.8
Net foreign exchange (loss) gain	34.0	(2.3)	(2.9)
Total identifiable assets	38,907.8	33,345.0	22,331.4
Goodwill - net	9,489.4	8,666.2	6,127.0
Amortizable intangible assets - net	3,372.1	3,954.0	2,399.9
Unites States [Member]
Segment Reporting Information [Line Items]
Total revenues	5,557.2	5,856.8	5,048.9
Total identifiable assets	21,301.8	18,828.6	11,786.3
Goodwill - net	5,140.5	4,473.9
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	1,588.4	1,245.0	1,034.4
Total identifiable assets	9,602.5	8,385.4	6,274.3
Goodwill - net	2,197.9	2,213.7
Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	410.9	376.1	314.5
Total identifiable assets	1,886.9	1,768.9	1,462.9
Goodwill - net	477.8	498.1
Canada [Member]
Segment Reporting Information [Line Items]
Total revenues	361.9	308.0	249.1
Total identifiable assets	1,480.8	1,440.5	1,058.4
Goodwill - net	569.7	572.9
New Zealand [Member]
Segment Reporting Information [Line Items]
Total revenues	181.3	177.0	154.4
Total identifiable assets	749.8	775.0	790.1
Goodwill - net	213.3	227.8
Other Foreign [Member]
Segment Reporting Information [Line Items]
Total revenues	450.9	246.5	202.3
Total identifiable assets	3,886.0	2,146.6	959.4
Goodwill - net	890.2	679.8
Commissions [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	5,187.4	4,132.3	3,591.9
Broker Fees [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	2,567.7	2,264.1	1,957.9
Supplemental Revenue [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	284.7	248.7	221.9
Contingent Revenue [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	207.3	188.0	147.0
Investment Income [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	136.3	83.1	75.9
Net (Losses) Gains on Divestitures [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	13.0	18.9	(5.8)
Clean Coal Activities [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	23.0	1,140.8	863.5
Other income (Losses) [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	0.7	0.5	(0.4)
Brokerage [Member]
Segment Reporting Information [Line Items]
Goodwill - net	9,358.1	8,544.6	6,053.6
Brokerage [Member] | Unites States [Member]
Segment Reporting Information [Line Items]
Goodwill - net	5,065.7	4,409.1
Brokerage [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Goodwill - net	2,180.2	2,198.7
Brokerage [Member] | Australia [Member]
Segment Reporting Information [Line Items]
Goodwill - net	467.6	487.2
Brokerage [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Goodwill - net	569.7	572.9
Brokerage [Member] | New Zealand [Member]
Segment Reporting Information [Line Items]
Goodwill - net	203.8	217.6
Brokerage [Member] | Other Foreign [Member]
Segment Reporting Information [Line Items]
Goodwill - net	871.1	659.1
Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	7,303.8	5,967.5	5,167.1
Total revenues	7,303.8	5,967.5	5,167.1
Compensation	4,024.7	3,252.4	2,882.5
Operating	1,039.9	757.9	687.2
Depreciation	103.6	87.8	73.5
Amortization	448.7	407.6	411.3
Change in estimated acquisition earnout payables	90.4	116.3	(29.7)
Total expenses	5,707.3	4,622.0	4,024.8
Earnings before income taxes	1,596.5	1,345.5	1,142.3
Provision (benefit) for income taxes	394.7	328.9	276.3
Net earnings	1,201.8	1,016.6	866.0
Net earnings attributable to noncontrolling interests	4.4	8.4	4.9
Net earnings attributable to controlling interests	1,197.4	1,008.2	861.1
Net foreign exchange (loss) gain	2.6	(1.7)	(2.6)
Total identifiable assets	35,205.1	29,821.0	19,185.3
Goodwill - net	9,358.1	8,544.6	6,053.6
Amortizable intangible assets - net	3,325.9	3,906.1	2,376.3
Brokerage [Member] | Operating Segments [Member] | Unites States [Member]
Segment Reporting Information [Line Items]
Total revenues	4,503.9	3,804.8	3,369.4
Total identifiable assets	17,827.2	15,548.3	8,897.9
Brokerage [Member] | Operating Segments [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	1,544.3	1,199.0	993.7
Total identifiable assets	9,486.6	8,251.3	6,135.1
Brokerage [Member] | Operating Segments [Member] | Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	281.8	252.6	216.1
Total identifiable assets	1,797.9	1,684.2	1,373.3
Brokerage [Member] | Operating Segments [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Total revenues	356.0	302.2	243.8
Total identifiable assets	1,476.4	1,436.1	1,053.6
Brokerage [Member] | Operating Segments [Member] | New Zealand [Member]
Segment Reporting Information [Line Items]
Total revenues	166.9	162.4	141.8
Total identifiable assets	731.0	754.5	766.0
Brokerage [Member] | Operating Segments [Member] | Other Foreign [Member]
Segment Reporting Information [Line Items]
Total revenues	450.9	246.5	202.3
Total identifiable assets	3,886.0	2,146.6	959.4
Brokerage [Member] | Commissions [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	5,187.4	4,132.3	3,591.9
Brokerage [Member] | Broker Fees [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	1,476.9	1,296.9	1,136.9
Brokerage [Member] | Supplemental Revenue [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	284.7	248.7	221.9
Brokerage [Member] | Contingent Revenue [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	207.3	188.0	147.0
Brokerage [Member] | Investment Income [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	135.4	82.8	75.2
Brokerage [Member] | Net (Losses) Gains on Divestitures [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	12.1	18.8	(5.8)
Risk Management [Member]
Segment Reporting Information [Line Items]
Goodwill - net	112.2	100.9	70.5
Risk Management [Member] | Unites States [Member]
Segment Reporting Information [Line Items]
Goodwill - net	74.8	64.8
Risk Management [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Goodwill - net	17.7	15.0
Risk Management [Member] | Australia [Member]
Segment Reporting Information [Line Items]
Goodwill - net	10.2	10.9
Risk Management [Member] | New Zealand [Member]
Segment Reporting Information [Line Items]
Goodwill - net	9.5	10.2
Risk Management [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	1,092.6	967.6	821.7
Reimbursements	130.5	133.0	151.7
Total revenues	1,223.1	1,100.6	973.4
Compensation	664.9	580.7	517.5
Operating	233.9	209.8	162.6
Reimbursements	130.5	133.0	151.7
Depreciation	37.8	46.2	49.4
Amortization	6.2	7.5	6.0
Change in estimated acquisition earnout payables	(7.4)	3.3	(3.2)
Total expenses	1,065.9	980.5	884.0
Earnings before income taxes	157.2	120.1	89.4
Provision (benefit) for income taxes	41.4	30.6	22.5
Net earnings	115.8	89.5	66.9
Net earnings attributable to controlling interests	115.8	89.5	66.9
Net foreign exchange (loss) gain	31.4		(0.1)
Total identifiable assets	1,142.5	1,034.4	973.9
Goodwill - net	112.2	100.9	70.5
Amortizable intangible assets - net	46.2	47.9	23.6
Risk Management [Member] | Operating Segments [Member] | Unites States [Member]
Segment Reporting Information [Line Items]
Total revenues	1,029.6	910.7	816.4
Total identifiable assets	914.4	790.7	716.2
Risk Management [Member] | Operating Segments [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	44.1	46.0	40.7
Total identifiable assets	115.9	134.1	139.2
Risk Management [Member] | Operating Segments [Member] | Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	129.1	123.5	98.4
Total identifiable assets	89.0	84.7	89.6
Risk Management [Member] | Operating Segments [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Total revenues	5.9	5.8	5.3
Total identifiable assets	4.4	4.4	4.8
Risk Management [Member] | Operating Segments [Member] | New Zealand [Member]
Segment Reporting Information [Line Items]
Total revenues	14.4	14.6	12.6
Total identifiable assets	18.8	20.5	24.1
Risk Management [Member] | Broker Fees [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	1,090.8	967.2	821.0
Risk Management [Member] | Investment Income [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	0.9	0.3	0.7
Risk Management [Member] | Net (Losses) Gains on Divestitures [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	0.9	0.1
Corporate [Member]
Segment Reporting Information [Line Items]
Goodwill - net	19.1	20.7	2.9
Corporate [Member] | Other Foreign [Member]
Segment Reporting Information [Line Items]
Goodwill - net	19.1	20.7
Corporate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	23.7	1,141.3	863.1
Total revenues	23.7	1,141.3	863.1
Compensation	110.2	94.4	66.5
Operating	57.1	104.7	56.7
Cost of revenues from clean coal activities	22.9	1,173.2	882.1
Interest	256.9	226.1	196.4
Loss on extinguishment of debt		16.2
Depreciation	3.3	17.2	22.2
Total expenses	450.4	1,631.8	1,223.9
Earnings before income taxes	(426.7)	(490.5)	(360.8)
Provision (benefit) for income taxes	(225.1)	(339.4)	(286.0)
Net earnings	(201.6)	(151.1)	(74.8)
Net earnings attributable to noncontrolling interests	(2.6)	39.8	34.4
Net earnings attributable to controlling interests	(199.0)	(190.9)	(109.2)
Net foreign exchange (loss) gain		(0.6)	(0.2)
Total identifiable assets	2,560.2	2,489.6	2,172.2
Goodwill - net	19.1	20.7	2.9
Corporate [Member] | Operating Segments [Member] | Unites States [Member]
Segment Reporting Information [Line Items]
Total revenues	23.7	1,141.3	863.1
Total identifiable assets	2,560.2	2,489.6	2,172.2
Corporate [Member] | Clean Coal Activities [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	23.0	1,140.8	863.5
Corporate [Member] | Other income (Losses) [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	$ 0.7	$ (0.5)	$ (0.4)

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