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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Revenues before reimbursements $ 3,688.4 $ 3,218.1  
Reimbursements 39.0 38.6  
Total revenues 3,727.4 3,256.7  
Compensation 1,897.7 1,725.9  
Operating 490.4 435.7  
Reimbursements 39.0 38.6  
Interest 158.4 92.2  
Depreciation 44.1 45.4  
Amortization 209.3 162.3  
Change in estimated acquisition earnout payables 15.8 (16.1)  
Total expenses 2,854.7 2,484.0  
Earnings before income taxes 872.7 772.7  
Provision (benefit) for income taxes 163.8 160.0  
Net earnings 708.9 612.7  
Net earnings (loss) attributable to noncontrolling interests 4.5 4.3  
Net earnings attributable to controlling interests 704.4 608.4  
Net foreign exchange gain 24.5 (1.1)  
Total identifiable assets 74,095.7 60,975.9 $ 64,255.2
Goodwill - net 12,714.7 11,532.1 12,270.2
Amortizable intangible assets - net 4,532.2 4,621.7  
Unites States [Member]      
Segment Reporting Information [Line Items]      
Total revenues 2,463.4 2,134.9  
Total identifiable assets 41,142.0 27,388.0  
Goodwill - net 7,143.9   7,040.4
United Kingdom [Member]      
Segment Reporting Information [Line Items]      
Total revenues 696.8 598.8  
Total identifiable assets 21,263.8 22,070.0  
Goodwill - net 2,785.9   2,617.1
Australia [Member]      
Segment Reporting Information [Line Items]      
Total revenues 124.8 121.0  
Total identifiable assets 1,962.2 2,031.3  
Goodwill - net 744.4   728.4
Canada [Member]      
Segment Reporting Information [Line Items]      
Total revenues 100.8 104.8  
Total identifiable assets 1,689.4 1,734.4  
Goodwill - net 604.6   586.9
New Zealand [Member]      
Segment Reporting Information [Line Items]      
Total revenues 39.9 43.9  
Total identifiable assets 672.4 681.4  
Goodwill - net 202.5   191.7
Other Foreign [Member]      
Segment Reporting Information [Line Items]      
Total revenues 301.7 253.3  
Total identifiable assets 7,365.9 7,070.8  
Goodwill - net 1,233.4   1,105.7
Commissions [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 2,249.2 1,993.6  
Broker Fees [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 984.8 951.2  
Supplemental Revenue [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 113.9 93.9  
Contingent Revenue [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 92.9 86.0  
Interest Income, Premium Finance Revenues and Other Income [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 247.6 93.4  
Investment Income [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 247.6 93.4  
Brokerage [Member]      
Segment Reporting Information [Line Items]      
Goodwill - net 12,277.0   11,923.4
Brokerage [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 3,314.6 2,864.9  
Total revenues 3,314.6 2,864.9  
Compensation 1,617.2 1,476.8  
Operating 346.4 339.4  
Depreciation 32.9 32.8  
Amortization 203.6 156.0  
Change in estimated acquisition earnout payables 15.4 (16.2)  
Total expenses 2,215.5 1,988.8  
Earnings before income taxes 1,099.1 876.1  
Provision (benefit) for income taxes 283.0 223.5  
Net earnings 816.1 652.6  
Net earnings (loss) attributable to noncontrolling interests 4.5 4.3  
Net earnings attributable to controlling interests 811.6 648.3  
Net foreign exchange gain 0.6 (0.7)  
Total identifiable assets 54,427.8 56,371.6  
Goodwill - net 12,277.0 11,281.0 11,923.4
Amortizable intangible assets - net 4,335.4 4,430.0  
Brokerage [Member] | Operating Segments [Member] | Unites States [Member]      
Segment Reporting Information [Line Items]      
Total revenues 2,131.2 1,814.0  
Total identifiable assets 22,461.1 23,482.4  
Goodwill - net 7,069.1   6,965.6
Brokerage [Member] | Operating Segments [Member] | United Kingdom [Member]      
Segment Reporting Information [Line Items]      
Total revenues 675.5 584.8  
Total identifiable assets 20,826.5 21,950.1  
Goodwill - net 2,671.6   2,591.4
Brokerage [Member] | Operating Segments [Member] | Australia [Member]      
Segment Reporting Information [Line Items]      
Total revenues 68.6 68.0  
Total identifiable assets 1,582.6 1,579.6  
Goodwill - net 523.0   509.1
Brokerage [Member] | Operating Segments [Member] | Canada [Member]      
Segment Reporting Information [Line Items]      
Total revenues 99.0 103.1  
Total identifiable assets 1,684.9 1,730.1  
Goodwill - net 604.6   586.9
Brokerage [Member] | Operating Segments [Member] | New Zealand [Member]      
Segment Reporting Information [Line Items]      
Total revenues 39.8 41.7  
Total identifiable assets 658.9 662.6  
Goodwill - net 193.8   183.2
Brokerage [Member] | Operating Segments [Member] | Other Foreign [Member]      
Segment Reporting Information [Line Items]      
Total revenues 300.5 253.3  
Total identifiable assets 7,213.8 6,966.8  
Goodwill - net 1,214.9   1,087.2
Brokerage [Member] | Commissions [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 2,249.2 1,993.6  
Brokerage [Member] | Broker Fees [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 620.2 606.7  
Brokerage [Member] | Supplemental Revenue [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 113.9 93.9  
Brokerage [Member] | Contingent Revenue [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 92.9 86.0  
Brokerage [Member] | Interest Income, Premium Finance Revenues and Other Income [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 238.4 84.7  
Risk Management [Member]      
Segment Reporting Information [Line Items]      
Goodwill - net 419.2   328.3
Risk Management [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 373.4 352.8  
Reimbursements 39.0 38.6  
Total revenues 412.4 391.4  
Compensation 231.1 213.9  
Operating 70.8 68.4  
Reimbursements 39.0 38.6  
Depreciation 9.5 10.9  
Amortization 5.7 6.3  
Change in estimated acquisition earnout payables 0.4 0.1  
Total expenses 356.5 338.2  
Earnings before income taxes 55.9 53.2  
Provision (benefit) for income taxes 14.8 13.9  
Net earnings 41.1 39.3  
Net earnings attributable to controlling interests 41.1 39.3  
Total identifiable assets 1,982.4 1,673.5  
Goodwill - net 419.2 232.1 328.3
Amortizable intangible assets - net 196.8 191.7  
Risk Management [Member] | Operating Segments [Member] | Unites States [Member]      
Segment Reporting Information [Line Items]      
Total revenues 331.8 320.5  
Total identifiable assets 1,129.9 1,078.8  
Goodwill - net 74.8   74.8
Risk Management [Member] | Operating Segments [Member] | United Kingdom [Member]      
Segment Reporting Information [Line Items]      
Total revenues 21.3 14.0  
Total identifiable assets 427.4 119.9  
Goodwill - net 114.3   25.7
Risk Management [Member] | Operating Segments [Member] | Australia [Member]      
Segment Reporting Information [Line Items]      
Total revenues 56.2 53.0  
Total identifiable assets 379.6 451.7  
Goodwill - net 221.4   219.3
Risk Management [Member] | Operating Segments [Member] | Canada [Member]      
Segment Reporting Information [Line Items]      
Total revenues 1.8 1.7  
Total identifiable assets 4.5 4.3  
Risk Management [Member] | Operating Segments [Member] | New Zealand [Member]      
Segment Reporting Information [Line Items]      
Total revenues 0.1 2.2  
Total identifiable assets 13.5 18.8  
Goodwill - net 8.7   8.5
Risk Management [Member] | Operating Segments [Member] | Other Foreign [Member]      
Segment Reporting Information [Line Items]      
Total revenues 1.2    
Total identifiable assets 27.5    
Risk Management [Member] | Broker Fees [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 364.6 344.5  
Risk Management [Member] | Interest Income, Premium Finance Revenues and Other Income [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 8.8 8.3  
Corporate [Member]      
Segment Reporting Information [Line Items]      
Goodwill - net 18.5   18.5
Corporate [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 0.4 0.4  
Total revenues 0.4 0.4  
Compensation 49.4 35.2  
Operating 73.2 27.9  
Interest 158.4 92.2  
Depreciation 1.7 1.7  
Total expenses 282.7 157.0  
Earnings before income taxes (282.3) (156.6)  
Provision (benefit) for income taxes (134.0) (77.4)  
Net earnings (148.3) (79.2)  
Net earnings attributable to controlling interests (148.3) (79.2)  
Net foreign exchange gain 23.9 (0.4)  
Total identifiable assets 17,685.5 2,930.8  
Goodwill - net 18.5 19.0 18.5
Corporate [Member] | Operating Segments [Member] | Unites States [Member]      
Segment Reporting Information [Line Items]      
Total revenues 0.4 0.4  
Total identifiable assets 17,551.0 2,826.8  
Corporate [Member] | Operating Segments [Member] | United Kingdom [Member]      
Segment Reporting Information [Line Items]      
Total identifiable assets 9.9    
Corporate [Member] | Operating Segments [Member] | Other Foreign [Member]      
Segment Reporting Information [Line Items]      
Total identifiable assets 124.6 104.0  
Goodwill - net 18.5   $ 18.5
Corporate [Member] | Interest Income, Premium Finance Revenues and Other Income [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements $ 0.4 $ 0.4