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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenues before reimbursements $ 11,400.6 $ 9,926.5 $ 8,420.1
Reimbursements 154.3 145.4 130.5
Total revenues 11,554.9 10,071.9 8,550.6
Compensation 6,522.3 5,681.2 4,799.8
Operating 1,753.9 1,689.7 1,330.9
Reimbursements 154.3 145.4 130.5
Cost of revenues from clean coal activities     22.9
Interest 381.3 296.7 256.9
Depreciation 177.5 165.2 144.7
Amortization 664.8 531.3 454.9
Change in estimated acquisition earnout payables 26.0 377.3 83.0
Total expenses 9,680.1 8,886.8 7,223.6
Earnings before income taxes 1,874.8 1,185.1 1,327.0
Provision (benefit) for income taxes 404.4 219.1 211.0
Net earnings 1,470.4 966.0 1,116.0
Net earnings (loss) attributable to noncontrolling interests 7.7 (3.5) 1.8
Net earnings attributable to controlling interests 1,462.7 969.5 1,114.2
Net foreign exchange gain (loss) (0.4) (10.3) 34.0
Total identifiable assets 64,255.2 51,615.8 38,358.4
Goodwill - net 12,270.2 11,475.6 9,489.4
Amortizable intangible assets - net 4,530.1 4,633.3 3,372.1
Unites States [Member]      
Segment Reporting Information [Line Items]      
Total revenues 7,427.9 6,426.5 5,557.2
Total identifiable assets 38,049.4 25,310.3 20,940.6
Goodwill - net 7,040.4 6,379.3  
United Kingdom [Member]      
Segment Reporting Information [Line Items]      
Total revenues 2,225.4 1,994.1 1,588.4
Total identifiable assets 16,201.4 16,129.6 9,454.4
Goodwill - net 2,617.1 2,511.9  
Australia [Member]      
Segment Reporting Information [Line Items]      
Total revenues 574.6 466.8 410.9
Total identifiable assets 2,148.3 2,438.9 1,881.1
Goodwill - net 728.4 650.5  
Canada [Member]      
Segment Reporting Information [Line Items]      
Total revenues 416.0 403.9 361.9
Total identifiable assets 1,690.0 1,697.0 1,469.7
Goodwill - net 586.9 623.7  
New Zealand [Member]      
Segment Reporting Information [Line Items]      
Total revenues 210.2 208.0 181.3
Total identifiable assets 733.0 793.2 749.7
Goodwill - net 191.7 213.8  
Other Foreign [Member]      
Segment Reporting Information [Line Items]      
Total revenues 700.8 572.6 450.9
Total identifiable assets 5,433.1 5,246.8 3,862.9
Goodwill - net 1,105.7 1,096.4  
Commissions [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 6,693.8 5,865.0 5,187.4
Broker Fees [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 3,606.6 3,144.7 2,567.7
Supplemental Revenue [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 359.4 314.2 284.7
Contingent Revenue [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 267.6 235.3 207.3
Interest Income, Premium Finance Revenues and Other Income [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 473.2 367.3 150.0
Investment Income [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 473.2 367.3 150.0
Clean Coal Activities [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements     23.0
Brokerage [Member]      
Segment Reporting Information [Line Items]      
Goodwill - net 11,923.4 11,217.8 9,358.1
Brokerage [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 9,933.8 8,637.2 7,303.8
Total revenues 9,933.8 8,637.2 7,303.8
Compensation 5,501.4 4,769.1 4,024.7
Operating 1,363.4 1,272.3 1,039.9
Depreciation 133.1 124.4 103.6
Amortization 651.0 523.6 448.7
Change in estimated acquisition earnout payables 25.6 376.8 90.4
Total expenses 7,674.5 7,066.2 5,707.3
Earnings before income taxes 2,259.3 1,571.0 1,596.5
Provision (benefit) for income taxes 573.6 401.6 394.7
Net earnings 1,685.7 1,169.4 1,201.8
Net earnings (loss) attributable to noncontrolling interests 7.7 6.3 4.4
Net earnings attributable to controlling interests 1,678.0 1,163.1 1,197.4
Net foreign exchange gain (loss) 0.8 (0.3) 2.6
Total identifiable assets 46,439.2 47,446.1 34,675.0
Goodwill - net 11,923.4 11,217.8 9,358.1
Amortizable intangible assets - net 4,412.7 4,427.9 3,325.9
Brokerage [Member] | Operating Segments [Member] | Unites States [Member]      
Segment Reporting Information [Line Items]      
Total revenues 6,103.9 5,216.1 4,503.9
Total identifiable assets 20,910.6 21,763.9 17,485.3
Goodwill - net 6,965.6 6,304.5  
Brokerage [Member] | Operating Segments [Member] | United Kingdom [Member]      
Segment Reporting Information [Line Items]      
Total revenues 2,168.4 1,946.5 1,544.3
Total identifiable assets 16,051.2 15,999.7 9,338.5
Goodwill - net 2,591.4 2,493.4  
Brokerage [Member] | Operating Segments [Member] | Australia [Member]      
Segment Reporting Information [Line Items]      
Total revenues 348.8 312.1 281.8
Total identifiable assets 1,766.8 1,969.7 1,792.1
Goodwill - net 509.1 514.6  
Brokerage [Member] | Operating Segments [Member] | Canada [Member]      
Segment Reporting Information [Line Items]      
Total revenues 409.1 397.7 356.0
Total identifiable assets 1,684.1 1,692.9 1,465.3
Goodwill - net 586.9 623.7  
Brokerage [Member] | Operating Segments [Member] | New Zealand [Member]      
Segment Reporting Information [Line Items]      
Total revenues 202.8 192.2 166.9
Total identifiable assets 718.9 773.1 730.9
Goodwill - net 183.2 204.2  
Brokerage [Member] | Operating Segments [Member] | Other Foreign [Member]      
Segment Reporting Information [Line Items]      
Total revenues 700.8 572.6 450.9
Total identifiable assets 5,307.6 5,246.8 3,862.9
Goodwill - net 1,087.2 1,077.4  
Brokerage [Member] | Commissions [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 6,693.8 5,865.0 5,187.4
Brokerage [Member] | Broker Fees [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 2,192.6 1,885.0 1,476.9
Brokerage [Member] | Supplemental Revenue [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 359.4 314.2 284.7
Brokerage [Member] | Contingent Revenue [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 267.6 235.3 207.3
Brokerage [Member] | Interest Income, Premium Finance Revenues and Other Income [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 420.4 337.7 147.5
Risk Management [Member]      
Segment Reporting Information [Line Items]      
Goodwill - net 328.3 238.8 112.2
Risk Management [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 1,450.5 1,287.6 1,092.6
Reimbursements 154.3 145.4 130.5
Total revenues 1,604.8 1,433.0 1,223.1
Compensation 882.4 776.8 664.9
Operating 278.7 257.4 233.9
Reimbursements 154.3 145.4 130.5
Depreciation 37.6 35.9 37.8
Amortization 13.8 7.7 6.2
Change in estimated acquisition earnout payables 0.4 0.5 (7.4)
Total expenses 1,367.2 1,223.7 1,065.9
Earnings before income taxes 237.6 209.3 157.2
Provision (benefit) for income taxes 63.1 55.3 41.4
Net earnings 174.5 154.0 115.8
Net earnings attributable to controlling interests 174.5 154.0 115.8
Net foreign exchange gain (loss)   (9.9) 31.4
Total identifiable assets 1,661.7 1,649.3 1,142.6
Goodwill - net 328.3 238.8 112.2
Amortizable intangible assets - net 117.4 205.4 46.2
Risk Management [Member] | Operating Segments [Member] | Unites States [Member]      
Segment Reporting Information [Line Items]      
Total revenues 1,307.7 1,208.7 1,029.6
Total identifiable assets 1,110.0 1,026.0 914.5
Goodwill - net 74.8 74.8  
Risk Management [Member] | Operating Segments [Member] | United Kingdom [Member]      
Segment Reporting Information [Line Items]      
Total revenues 57.0 47.6 44.1
Total identifiable assets 150.2 129.9 115.9
Goodwill - net 25.7 18.5  
Risk Management [Member] | Operating Segments [Member] | Australia [Member]      
Segment Reporting Information [Line Items]      
Total revenues 225.8 154.7 129.1
Total identifiable assets 381.5 469.2 89.0
Goodwill - net 219.3 135.9  
Risk Management [Member] | Operating Segments [Member] | Canada [Member]      
Segment Reporting Information [Line Items]      
Total revenues 6.9 6.2 5.9
Total identifiable assets 5.9 4.1 4.4
Risk Management [Member] | Operating Segments [Member] | New Zealand [Member]      
Segment Reporting Information [Line Items]      
Total revenues 7.4 15.8 14.4
Total identifiable assets 14.1 20.1 18.8
Goodwill - net 8.5 9.6  
Risk Management [Member] | Broker Fees [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 1,414.0 1,259.7 1,090.8
Risk Management [Member] | Interest Income, Premium Finance Revenues and Other Income [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 36.5 27.9 1.8
Corporate [Member]      
Segment Reporting Information [Line Items]      
Goodwill - net 18.5 19.0 19.1
Corporate [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements 16.3 1.7 23.7
Total revenues 16.3 1.7 23.7
Compensation 138.5 135.3 110.2
Operating 111.8 160.0 57.1
Cost of revenues from clean coal activities     22.9
Interest 381.3 296.7 256.9
Depreciation 6.8 4.9 3.3
Total expenses 638.4 596.9 450.4
Earnings before income taxes (622.1) (595.2) (426.7)
Provision (benefit) for income taxes (232.3) (237.8) (225.1)
Net earnings (389.8) (357.4) (201.6)
Net earnings (loss) attributable to noncontrolling interests   (9.8) (2.6)
Net earnings attributable to controlling interests (389.8) (347.6) (199.0)
Net foreign exchange gain (loss) (1.2) (0.1)  
Total identifiable assets 16,154.3 2,520.4 2,540.8
Goodwill - net 18.5 19.0 19.1
Corporate [Member] | Operating Segments [Member] | Unites States [Member]      
Segment Reporting Information [Line Items]      
Total revenues 16.3 1.7 23.7
Total identifiable assets 16,028.8 2,520.4 2,540.8
Corporate [Member] | Operating Segments [Member] | Other Foreign [Member]      
Segment Reporting Information [Line Items]      
Total identifiable assets 125.5    
Goodwill - net 18.5 19.0  
Corporate [Member] | Interest Income, Premium Finance Revenues and Other Income [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements $ 16.3 $ 1.7 0.7
Corporate [Member] | Clean Coal Activities [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues before reimbursements     $ 23.0