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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]                  
Revenues before reimbursements $ 3,325.4     $ 2,766.5     $ 10,191.7 $ 8,720.6  
Reimbursements 40.2     40.3     122.1 118.3  
Total revenues 3,365.6     2,806.8     10,313.8 8,838.9  
Compensation 1,931.7     1,621.9     5,632.8 4,967.9  
Operating 580.8     453.7     1,590.5 1,315.0  
Reimbursements 40.2     40.3     122.1 118.3  
Interest 160.8     92.9     477.8 279.4  
Depreciation 54.1     45.3     147.9 131.5  
Amortization 222.2     164.7     612.6 497.8  
Change in estimated acquisition earnout payables 28.9     (15.3)     39.1 (12.6)  
Total expenses 3,018.7     2,403.5     8,622.8 7,297.3  
Earnings before income taxes 346.9     403.3     1,691.0 1,541.6  
Provision (benefit) for income taxes 73.3     89.2     342.3 329.4  
Net earnings 273.6 $ 366.2 $ 708.9 314.1 $ 285.4 $ 612.7 1,348.7 1,212.2  
Net earnings attributable to noncontrolling interests 0.9     1.5     5.8 7.8  
Net earnings attributable to controlling interests 272.7     312.6     1,342.9 1,204.4  
Net foreign exchange (loss) gain 1.6     (15.4)     (48.7) (16.0)  
Total identifiable assets 79,067.9     57,242.7     79,067.9 57,242.7 $ 64,255.2
Goodwill 22,213.3     12,193.4     22,213.3 12,193.4 12,270.2
Amortizable intangible assets - net 10,754.4     4,353.2     10,754.4 4,353.2  
United States                  
Segment Reporting Information [Line Items]                  
Total revenues 2,370.2     1,849.6     6,882.1 5,704.4  
Total identifiable assets 44,695.2     26,407.4     44,695.2 26,407.4  
Goodwill 16,306.1           16,306.1   7,040.4
United Kingdom                  
Segment Reporting Information [Line Items]                  
Total revenues 512.5     512.9     1,880.4 1,700.3  
Total identifiable assets 21,486.4     19,498.4     21,486.4 19,498.4  
Goodwill 2,921.0           2,921.0   2,617.1
Australia                  
Segment Reporting Information [Line Items]                  
Total revenues 151.2     152.0     431.5 419.9  
Total identifiable assets 2,327.1     2,289.9     2,327.1 2,289.9  
Goodwill 809.2           809.2   728.4
Canada                  
Segment Reporting Information [Line Items]                  
Total revenues 90.0     95.3     297.2 312.1  
Total identifiable assets 1,733.2     1,779.2     1,733.2 1,779.2  
Goodwill 619.5           619.5   586.9
New Zealand                  
Segment Reporting Information [Line Items]                  
Total revenues 54.6     55.1     152.2 157.0  
Total identifiable assets 777.1     836.4     777.1 836.4  
Goodwill 230.3           230.3   191.7
Other foreign                  
Segment Reporting Information [Line Items]                  
Total revenues 187.1     141.9     670.4 545.2  
Total identifiable assets 8,048.9     6,431.4     8,048.9 6,431.4  
Goodwill 1,327.2           1,327.2   1,105.7
Commissions                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 1,908.3     1,537.8     5,965.0 5,193.2  
Fees                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 1,057.0     945.0     3,004.2 2,723.3  
Supplemental revenues                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 117.6     79.1     334.3 261.7  
Contingent revenues                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 75.4     69.3     241.0 215.1  
Interest income, premium finance revenues and other income                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 167.1     135.3     647.2 327.3  
Brokerage                  
Segment Reporting Information [Line Items]                  
Goodwill 21,738.9           21,738.9   11,923.4
Brokerage | Operating Segments                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 2,922.9     2,396.4     9,023.1 7,637.6  
Reimbursements 0.0     0.0     0.0 0.0  
Total revenues 2,922.9     2,396.4     9,023.1 7,637.6  
Compensation 1,649.0     1,362.9     4,792.4 4,210.0  
Operating 433.6     342.0     1,148.9 1,019.3  
Reimbursements 0.0     0.0     0.0 0.0  
Interest 0.0     0.0     0.0 0.0  
Depreciation 41.6     34.0     112.6 99.1  
Amortization 218.5     161.0     596.4 487.8  
Change in estimated acquisition earnout payables 28.5     (15.4)     37.6 (12.9)  
Total expenses 2,371.2     1,884.5     6,687.9 5,803.3  
Earnings before income taxes 551.7     511.9     2,335.2 1,834.3  
Provision (benefit) for income taxes 141.3     128.9     600.3 465.9  
Net earnings 410.4     383.0     1,734.9 1,368.4  
Net earnings attributable to noncontrolling interests 0.9     1.5     5.8 7.8  
Net earnings attributable to controlling interests 409.5     381.5     1,729.1 1,360.6  
Net foreign exchange (loss) gain (2.0)     (0.2)     (2.5) 1.2  
Total identifiable assets 60,089.8     52,472.6     60,089.8 52,472.6  
Goodwill 21,738.9     11,829.3     21,738.9 11,829.3 11,923.4
Amortizable intangible assets - net 10,581.0     4,241.4     10,581.0 4,241.4  
Brokerage | Operating Segments | United States                  
Segment Reporting Information [Line Items]                  
Total revenues 2,021.0     1,516.6     5,856.5 4,725.2  
Total identifiable assets 26,735.3     22,366.2     26,735.3 22,366.2  
Goodwill 16,231.3           16,231.3   6,965.6
Brokerage | Operating Segments | United Kingdom                  
Segment Reporting Information [Line Items]                  
Total revenues 484.5     497.2     1,803.0 1,656.6  
Total identifiable assets 21,065.5     19,357.5     21,065.5 19,357.5  
Goodwill 2,780.0           2,780.0   2,591.4
Brokerage | Operating Segments | Australia                  
Segment Reporting Information [Line Items]                  
Total revenues 89.6     93.8     254.8 252.7  
Total identifiable assets 1,887.3     1,856.9     1,887.3 1,856.9  
Goodwill 577.2           577.2   509.1
Brokerage | Operating Segments | Canada                  
Segment Reporting Information [Line Items]                  
Total revenues 88.0     93.7     291.5 307.1  
Total identifiable assets 1,725.9     1,774.4     1,725.9 1,774.4  
Goodwill 619.5           619.5   586.9
Brokerage | Operating Segments | New Zealand                  
Segment Reporting Information [Line Items]                  
Total revenues 54.6     53.2     152.0 150.8  
Total identifiable assets 768.1     816.9     768.1 816.9  
Goodwill 221.5           221.5   183.2
Brokerage | Operating Segments | Other foreign                  
Segment Reporting Information [Line Items]                  
Total revenues 185.2     141.9     665.3 545.2  
Total identifiable assets 7,907.7     6,300.7     7,907.7 6,300.7  
Goodwill 1,309.4           1,309.4   1,087.2
Brokerage | Commissions | Operating Segments                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 1,908.3     1,537.8     5,965.0 5,193.2  
Brokerage | Fees | Operating Segments                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 664.5     585.2     1,863.8 1,669.5  
Brokerage | Supplemental revenues | Operating Segments                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 117.6     79.1     334.3 261.7  
Brokerage | Contingent revenues | Operating Segments                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 75.4     69.3     241.0 215.1  
Brokerage | Interest income, premium finance revenues and other income | Operating Segments                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 157.1     125.0     619.0 298.1  
Risk Management                  
Segment Reporting Information [Line Items]                  
Goodwill 456.6           456.6   328.3
Risk Management | Operating Segments                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 402.1     369.7     1,167.4 1,081.1  
Reimbursements 40.2     40.3     122.1 118.3  
Total revenues 442.3     410.0     1,289.5 1,199.4  
Compensation 243.8     224.6     718.5 657.7  
Operating 76.3     71.0     220.0 206.5  
Reimbursements 40.2     40.3     122.1 118.3  
Interest 0.0     0.0     0.0 0.0  
Depreciation 10.5     9.6     29.9 27.3  
Amortization 3.7     3.7     16.2 10.0  
Change in estimated acquisition earnout payables 0.4     0.1     1.5 0.3  
Total expenses 374.9     349.3     1,108.2 1,020.1  
Earnings before income taxes 67.4     60.7     181.3 179.3  
Provision (benefit) for income taxes 17.9     16.1     48.1 47.6  
Net earnings 49.5     44.6     133.2 131.7  
Net earnings attributable to noncontrolling interests 0.0     0.0     0.0 0.0  
Net earnings attributable to controlling interests 49.5     44.6     133.2 131.7  
Net foreign exchange (loss) gain 0.2     0.0     (0.4) 0.0  
Total identifiable assets 2,047.0     1,785.6     2,047.0 1,785.6  
Goodwill 456.6     345.2     456.6 345.2 328.3
Amortizable intangible assets - net 173.4     111.8     173.4 111.8  
Risk Management | Operating Segments | United States                  
Segment Reporting Information [Line Items]                  
Total revenues 348.8     332.6     1,024.4 977.3  
Total identifiable assets 1,153.4     1,187.4     1,153.4 1,187.4  
Goodwill 74.8           74.8   74.8
Risk Management | Operating Segments | United Kingdom                  
Segment Reporting Information [Line Items]                  
Total revenues 28.0     15.7     77.4 43.7  
Total identifiable assets 419.4     140.9     419.4 140.9  
Goodwill 141.0           141.0   25.7
Risk Management | Operating Segments | Australia                  
Segment Reporting Information [Line Items]                  
Total revenues 61.6     58.2     176.7 167.2  
Total identifiable assets 439.8     433.0     439.8 433.0  
Goodwill 232.0           232.0   219.3
Risk Management | Operating Segments | Canada                  
Segment Reporting Information [Line Items]                  
Total revenues 2.0     1.6     5.7 5.0  
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 0.0     1.9     0.2 6.2  
Total identifiable assets 9.0     19.5     9.0 19.5  
Goodwill 8.8           8.8   8.5
Risk Management | Operating Segments | Other foreign                  
Segment Reporting Information [Line Items]                  
Total revenues 1.9     0.0     5.1 0.0  
Total identifiable assets 18.1     0.0     18.1 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 392.5     359.8     1,140.4 1,053.8  
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 9.6     9.9     27.0 27.3  
Corporate                  
Segment Reporting Information [Line Items]                  
Goodwill 17.8           17.8   18.5
Corporate | Operating Segments                  
Segment Reporting Information [Line Items]                  
Revenues before reimbursements 0.4     0.4     1.2 1.9  
Reimbursements 0.0     0.0     0.0 0.0  
Total revenues 0.4     0.4     1.2 1.9  
Compensation 38.9     34.4     121.9 100.2  
Operating 70.9     40.7     221.6 89.2  
Reimbursements 0.0     0.0     0.0 0.0  
Interest 160.8     92.9     477.8 279.4  
Depreciation 2.0     1.7     5.4 5.1  
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 272.6     169.7     826.7 473.9  
Earnings before income taxes (272.2)     (169.3)     (825.5) (472.0)  
Provision (benefit) for income taxes (85.9)     (55.8)     (306.1) (184.1)  
Net earnings (186.3)     (113.5)     (519.4) (287.9)  
Net earnings attributable to noncontrolling interests 0.0     0.0     0.0 0.0  
Net earnings attributable to controlling interests (186.3)     (113.5)     (519.4) (287.9)  
Net foreign exchange (loss) gain 3.4     (15.2)     (45.8) (17.2)  
Total identifiable assets 16,931.1     2,984.5     16,931.1 2,984.5  
Goodwill 17.8     18.9     17.8 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     0.4     1.2 1.9  
Total identifiable assets 16,806.5     2,853.8     16,806.5 2,853.8  
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 1.5     0.0     1.5 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 123.1     130.7     123.1 130.7  
Goodwill 17.8           17.8   $ 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     $ 0.4     $ 1.2 $ 1.9