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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, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]              
Revenues before reimbursements $ 3,177.9   $ 2,736.0   $ 6,866.3 $ 5,954.1  
Reimbursements 42.9   39.4   81.9 78.0  
Total revenues 3,220.8   2,775.4   6,948.2 6,032.1  
Compensation 1,803.4   1,620.1   3,701.1 3,346.0  
Operating 519.3   425.6   1,009.7 861.3  
Reimbursements 42.9   39.4   81.9 78.0  
Interest 158.6   94.3   317.0 186.5  
Depreciation 49.7   40.8   93.8 86.2  
Amortization 181.1   170.8   390.4 333.1  
Change in estimated acquisition earnout payables (5.6)   18.8   10.2 2.7  
Total expenses 2,749.4   2,409.8   5,604.1 4,893.8  
Earnings before income taxes 471.4   365.6   1,344.1 1,138.3  
Provision (benefit) for income taxes 105.2   80.2   269.0 240.2  
Net earnings 366.2 $ 708.9 285.4 $ 612.7 1,075.1 898.1  
Net earnings attributable to noncontrolling interests 0.4   2.0   4.9 6.3  
Net earnings attributable to controlling interests 365.8   283.4   1,070.2 891.8  
Net foreign exchange (loss) gain 25.7   1.7   50.2 1.7  
Total identifiable assets 80,122.6   63,007.7   80,122.6 63,007.7 $ 64,255.2
Goodwill 13,740.3   11,915.5   13,740.3 11,915.5 12,270.2
Amortizable intangible assets - net 5,131.6   4,389.4   5,131.6 4,389.4  
United States              
Segment Reporting Information [Line Items]              
Total revenues 2,048.6   1,719.9   4,512.0 3,854.8  
Total identifiable assets 42,712.0   28,985.6   42,712.0 28,985.6  
Goodwill 7,812.0       7,812.0   7,040.4
United Kingdom              
Segment Reporting Information [Line Items]              
Total revenues 671.1   588.6   1,367.9 1,187.4  
Total identifiable assets 23,246.0   21,910.1   23,246.0 21,910.1  
Goodwill 2,946.8       2,946.8   2,617.1
Australia              
Segment Reporting Information [Line Items]              
Total revenues 155.5   146.9   280.3 267.9  
Total identifiable assets 2,376.3   2,387.1   2,376.3 2,387.1  
Goodwill 795.5       795.5   728.4
Canada              
Segment Reporting Information [Line Items]              
Total revenues 106.4   112.0   207.2 216.8  
Total identifiable assets 1,915.3   1,944.4   1,915.3 1,944.4  
Goodwill 630.8       630.8   586.9
New Zealand              
Segment Reporting Information [Line Items]              
Total revenues 57.7   58.0   97.6 101.9  
Total identifiable assets 871.2   839.6   871.2 839.6  
Goodwill 236.6       236.6   191.7
Other foreign              
Segment Reporting Information [Line Items]              
Total revenues 181.6   150.0   483.3 403.3  
Total identifiable assets 9,001.7   6,940.9   9,001.7 6,940.9  
Goodwill 1,318.6       1,318.6   1,105.7
Commissions              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 1,807.5   1,661.8   4,056.7 3,655.4  
Fees              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 962.4   827.1   1,947.2 1,778.3  
Supplemental revenues              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 102.8   88.7   216.7 182.6  
Contingent revenues              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 72.7   59.8   165.6 145.8  
Interest income, premium finance revenues and other income              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 232.5   98.6   480.1 192.0  
Brokerage              
Segment Reporting Information [Line Items]              
Goodwill 13,282.9       13,282.9   11,923.4
Brokerage | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 2,785.6   2,376.3   6,100.2 5,241.2  
Reimbursements 0.0   0.0   0.0 0.0  
Total revenues 2,785.6   2,376.3   6,100.2 5,241.2  
Compensation 1,526.2   1,370.3   3,143.4 2,847.1  
Operating 368.9   337.9   715.3 677.3  
Reimbursements 0.0   0.0   0.0 0.0  
Interest 0.0   0.0   0.0 0.0  
Depreciation 38.1   32.3   71.0 65.1  
Amortization 174.3   170.8   377.9 326.8  
Change in estimated acquisition earnout payables (6.3)   18.7   9.1 2.5  
Total expenses 2,101.2   1,930.0   4,316.7 3,918.8  
Earnings before income taxes 684.4   446.3   1,783.5 1,322.4  
Provision (benefit) for income taxes 176.0   113.5   459.0 337.0  
Net earnings 508.4   332.8   1,324.5 985.4  
Net earnings attributable to noncontrolling interests 0.4   2.0   4.9 6.3  
Net earnings attributable to controlling interests 508.0   330.8   1,319.6 979.1  
Net foreign exchange (loss) gain (0.2)   (0.7)   0.4 (0.7)  
Total identifiable assets 62,734.9   58,776.7   62,734.9 58,776.7  
Goodwill 13,282.9   11,559.7   13,282.9 11,559.7 11,923.4
Amortizable intangible assets - net 4,932.4   4,276.7   4,932.4 4,276.7  
Brokerage | Operating Segments | United States              
Segment Reporting Information [Line Items]              
Total revenues 1,704.3   1,394.6   3,835.5 3,208.6  
Total identifiable assets 26,335.0   25,435.7   26,335.0 25,435.7  
Goodwill 7,737.2       7,737.2   6,965.6
Brokerage | Operating Segments | United Kingdom              
Segment Reporting Information [Line Items]              
Total revenues 643.0   574.6   1,318.5 1,159.4  
Total identifiable assets 22,802.8   21,785.7   22,802.8 21,785.7  
Goodwill 2,820.3       2,820.3   2,591.4
Brokerage | Operating Segments | Australia              
Segment Reporting Information [Line Items]              
Total revenues 96.6   90.9   165.2 158.9  
Total identifiable assets 1,982.5   1,960.7   1,982.5 1,960.7  
Goodwill 566.9       566.9   509.1
Brokerage | Operating Segments | Canada              
Segment Reporting Information [Line Items]              
Total revenues 104.5   110.3   203.5 213.4  
Total identifiable assets 1,908.0   1,939.6   1,908.0 1,939.6  
Goodwill 630.8       630.8   586.9
Brokerage | Operating Segments | New Zealand              
Segment Reporting Information [Line Items]              
Total revenues 57.6   55.9   97.4 97.6  
Total identifiable assets 859.5   820.8   859.5 820.8  
Goodwill 227.5       227.5   183.2
Brokerage | Operating Segments | Other foreign              
Segment Reporting Information [Line Items]              
Total revenues 179.6   150.0   480.1 403.3  
Total identifiable assets 8,847.1   6,834.2   8,847.1 6,834.2  
Goodwill 1,300.2       1,300.2   1,087.2
Brokerage | Commissions | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 1,807.5   1,661.8   4,056.7 3,655.4  
Brokerage | Fees | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 579.1   477.6   1,199.3 1,084.3  
Brokerage | Supplemental revenues | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 102.8   88.7   216.7 182.6  
Brokerage | Contingent revenues | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 72.7   59.8   165.6 145.8  
Brokerage | Interest income, premium finance revenues and other income | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 223.5   88.4   461.9 173.1  
Risk Management              
Segment Reporting Information [Line Items]              
Goodwill 439.0       439.0   328.3
Risk Management | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 391.9   358.6   765.3 711.4  
Reimbursements 42.9   39.4   81.9 78.0  
Total revenues 434.8   398.0   847.2 789.4  
Compensation 243.6   219.2   474.7 433.1  
Operating 72.9   67.1   143.7 135.5  
Reimbursements 42.9   39.4   81.9 78.0  
Interest 0.0   0.0   0.0 0.0  
Depreciation 9.9   6.8   19.4 17.7  
Amortization 6.8   0.0   12.5 6.3  
Change in estimated acquisition earnout payables 0.7   0.1   1.1 0.2  
Total expenses 376.8   332.6   733.3 670.8  
Earnings before income taxes 58.0   65.4   113.9 118.6  
Provision (benefit) for income taxes 15.4   17.6   30.2 31.5  
Net earnings 42.6   47.8   83.7 87.1  
Net earnings attributable to noncontrolling interests 0.0   0.0   0.0 0.0  
Net earnings attributable to controlling interests 42.6   47.8   83.7 87.1  
Net foreign exchange (loss) gain 0.6   0.0   0.6 0.0  
Total identifiable assets 2,014.6   1,683.4   2,014.6 1,683.4  
Goodwill 439.0   336.9   439.0 336.9 328.3
Amortizable intangible assets - net 199.2   112.7   199.2 112.7  
Risk Management | Operating Segments | United States              
Segment Reporting Information [Line Items]              
Total revenues 343.9   324.2   675.7 644.7  
Total identifiable assets 1,143.0   1,109.0   1,143.0 1,109.0  
Goodwill 74.8       74.8   74.8
Risk Management | Operating Segments | United Kingdom              
Segment Reporting Information [Line Items]              
Total revenues 28.1   14.0   49.4 28.0  
Total identifiable assets 433.5   124.4   433.5 124.4  
Goodwill 126.5       126.5   25.7
Risk Management | Operating Segments | Australia              
Segment Reporting Information [Line Items]              
Total revenues 58.9   56.0   115.1 109.0  
Total identifiable assets 393.8   426.4   393.8 426.4  
Goodwill 228.6       228.6   219.3
Risk Management | Operating Segments | Canada              
Segment Reporting Information [Line Items]              
Total revenues 1.9   1.7   3.7 3.4  
Total identifiable assets 7.3   4.8   7.3 4.8  
Goodwill 0.0       0.0   0.0
Risk Management | Operating Segments | New Zealand              
Segment Reporting Information [Line Items]              
Total revenues 0.1   2.1   0.2 4.3  
Total identifiable assets 11.7   18.8   11.7 18.8  
Goodwill 9.1       9.1   8.5
Risk Management | Operating Segments | Other foreign              
Segment Reporting Information [Line Items]              
Total revenues 2.0   0.0   3.2 0.0  
Total identifiable assets 25.2   0.0   25.2 0.0  
Goodwill 0.0       0.0   0.0
Risk Management | Commissions | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 0.0   0.0   0.0 0.0  
Risk Management | Fees | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 383.3   349.5   747.9 694.0  
Risk Management | Supplemental revenues | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 0.0   0.0   0.0 0.0  
Risk Management | Contingent revenues | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 0.0   0.0   0.0 0.0  
Risk Management | Interest income, premium finance revenues and other income | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 8.6   9.1   17.4 17.4  
Corporate              
Segment Reporting Information [Line Items]              
Goodwill 18.4       18.4   18.5
Corporate | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 0.4   1.1   0.8 1.5  
Reimbursements 0.0   0.0   0.0 0.0  
Total revenues 0.4   1.1   0.8 1.5  
Compensation 33.6   30.6   83.0 65.8  
Operating 77.5   20.6   150.7 48.5  
Reimbursements 0.0   0.0   0.0 0.0  
Interest 158.6   94.3   317.0 186.5  
Depreciation 1.7   1.7   3.4 3.4  
Amortization 0.0   0.0   0.0 0.0  
Change in estimated acquisition earnout payables 0.0   0.0   0.0 0.0  
Total expenses 271.4   147.2   554.1 304.2  
Earnings before income taxes (271.0)   (146.1)   (553.3) (302.7)  
Provision (benefit) for income taxes (86.2)   (50.9)   (220.2) (128.3)  
Net earnings (184.8)   (95.2)   (333.1) (174.4)  
Net earnings attributable to noncontrolling interests 0.0   0.0   0.0 0.0  
Net earnings attributable to controlling interests (184.8)   (95.2)   (333.1) (174.4)  
Net foreign exchange (loss) gain 25.3   2.4   49.2 2.4  
Total identifiable assets 15,373.1   2,547.6   15,373.1 2,547.6  
Goodwill 18.4   18.9   18.4 18.9 18.5
Amortizable intangible assets - net 0.0   0.0   0.0 0.0  
Corporate | Operating Segments | United States              
Segment Reporting Information [Line Items]              
Total revenues 0.4   1.1   0.8 1.5  
Total identifiable assets 15,234.0   2,440.9   15,234.0 2,440.9  
Goodwill 0.0       0.0   0.0
Corporate | Operating Segments | United Kingdom              
Segment Reporting Information [Line Items]              
Total revenues 0.0   0.0   0.0 0.0  
Total identifiable assets 9.7   0.0   9.7 0.0  
Goodwill 0.0       0.0   0.0
Corporate | Operating Segments | Australia              
Segment Reporting Information [Line Items]              
Total revenues 0.0   0.0   0.0 0.0  
Total identifiable assets 0.0   0.0   0.0 0.0  
Goodwill 0.0       0.0   0.0
Corporate | Operating Segments | Canada              
Segment Reporting Information [Line Items]              
Total revenues 0.0   0.0   0.0 0.0  
Total identifiable assets 0.0   0.0   0.0 0.0  
Goodwill 0.0       0.0   0.0
Corporate | Operating Segments | New Zealand              
Segment Reporting Information [Line Items]              
Total revenues 0.0   0.0   0.0 0.0  
Total identifiable assets 0.0   0.0   0.0 0.0  
Goodwill 0.0       0.0   0.0
Corporate | Operating Segments | Other foreign              
Segment Reporting Information [Line Items]              
Total revenues 0.0   0.0   0.0 0.0  
Total identifiable assets 129.4   106.7   129.4 106.7  
Goodwill 18.4       18.4   $ 18.5
Corporate | Commissions | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 0.0   0.0   0.0 0.0  
Corporate | Fees | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 0.0   0.0   0.0 0.0  
Corporate | Supplemental revenues | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 0.0   0.0   0.0 0.0  
Corporate | Contingent revenues | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements 0.0   0.0   0.0 0.0  
Corporate | Interest income, premium finance revenues and other income | Operating Segments              
Segment Reporting Information [Line Items]              
Revenues before reimbursements $ 0.4   $ 1.1   $ 0.8 $ 1.5