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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
shares
Devitt Insurance Services Ltd [Member]    
Business Acquisition [Line Items]    
Cash Paid   $ 73,600,000
Accrued Liability $ 1,300,000 1,300,000
Escrow Deposited 3,400,000 3,400,000
Recorded Earnout Payable   11,600,000
Total Recorded Purchase Price 89,900,000 89,900,000
Maximum Potential Earnout Payable 12,500,000 12,500,000
Innovu Group Holding Company Limited [Member]    
Business Acquisition [Line Items]    
Cash Paid   85,400,000
Total Recorded Purchase Price 85,400,000 $ 85,400,000
Eighteen Other Acquisitions [Member]    
Business Acquisition [Line Items]    
Common Shares Issued | shares   92.0
Common Share Value   $ 15,600,000
Cash Paid   232,300,000
Accrued Liability 17,600,000 17,600,000
Escrow Deposited 15,200,000 15,200,000
Recorded Earnout Payable 51,900,000  
Total Recorded Purchase Price 332,600,000 332,600,000
Maximum Potential Earnout Payable 118,300,000 $ 118,300,000
2022 Acquisitions [Member]    
Business Acquisition [Line Items]    
Common Shares Issued | shares   92.0
Common Share Value   $ 15,600,000
Cash Paid   391,300,000
Accrued Liability 18,900,000 18,900,000
Escrow Deposited 18,600,000 18,600,000
Recorded Earnout Payable   63,500,000
Total Recorded Purchase Price 507,900,000 507,900,000
Maximum Potential Earnout Payable $ 130,800,000 $ 130,800,000