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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended 285 Months Ended
Sep. 30, 2025
USD ($)
acquisition
Sep. 30, 2024
acquisition
Sep. 30, 2025
USD ($)
acquisition
shares
Sep. 30, 2024
acquisition
Sep. 30, 2025
USD ($)
company
Business Acquisition [Line Items]          
Number of companies acquired 41 29 82 74 776
2025 Acquisitions          
Business Acquisition [Line Items]          
Common Shares Issued (in shares) | shares     58    
Common Shares Value     $ 16.0    
Cash Paid     15,239.9    
Accrued Liability $ 36.7   36.7   $ 36.7
Escrow Deposited 423.4   423.4   423.4
Recorded Earnout Payable     92.4    
Total Recorded Purchase Price 15,808.4   15,808.4   15,808.4
Maximum Potential Earnout Payable 244.7   $ 244.7   244.7
W K Webster & Co Ltd February 1, 2025 (WKW)          
Business Acquisition [Line Items]          
Common Shares Issued (in shares) | shares     0    
Common Shares Value     $ 0.0    
Cash Paid     138.4    
Accrued Liability 1.9   1.9   1.9
Escrow Deposited 0.0   0.0   0.0
Recorded Earnout Payable     14.3    
Total Recorded Purchase Price 154.6   154.6   154.6
Maximum Potential Earnout Payable 28.5   $ 28.5   28.5
Case Group February 26, 2025 (CSG)          
Business Acquisition [Line Items]          
Common Shares Issued (in shares) | shares     0    
Common Shares Value     $ 0.0    
Cash Paid     57.8    
Accrued Liability 3.5   3.5   3.5
Escrow Deposited 6.5   6.5   6.5
Recorded Earnout Payable     15.0    
Total Recorded Purchase Price 82.8   82.8   82.8
Maximum Potential Earnout Payable 84.1   $ 84.1   84.1
Woodruff Sawyer & Co April 10, 2025 (WSC)          
Business Acquisition [Line Items]          
Common Shares Issued (in shares) | shares     0    
Common Shares Value     $ 0.0    
Cash Paid     1,195.5    
Accrued Liability 12.2   12.2   12.2
Escrow Deposited 66.6   66.6   66.6
Recorded Earnout Payable     0.0    
Total Recorded Purchase Price 1,274.3   1,274.3   1,274.3
Maximum Potential Earnout Payable 0.0   $ 0.0   0.0
APG          
Business Acquisition [Line Items]          
Common Shares Issued (in shares) | shares     0    
Common Shares Value     $ 0.0    
Cash Paid     13,444.9    
Accrued Liability 0.0   0.0   0.0
Escrow Deposited 335.0   335.0   335.0
Recorded Earnout Payable     0.0    
Total Recorded Purchase Price 13,779.9   13,779.9   13,779.9
Maximum Potential Earnout Payable 0.0   $ 0.0   0.0
Twenty-two Other Acquisitions          
Business Acquisition [Line Items]          
Common Shares Issued (in shares) | shares     58    
Common Shares Value     $ 16.0    
Cash Paid     403.3    
Accrued Liability 19.1   19.1   19.1
Escrow Deposited 15.3   15.3   15.3
Recorded Earnout Payable     63.1    
Total Recorded Purchase Price 516.8   516.8   516.8
Maximum Potential Earnout Payable $ 132.1   $ 132.1   $ 132.1
Number of companies acquired | acquisition     22