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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
shares
Atlas General Holdings LLC [Member]  
Business Acquisition [Line Items]  
Cash Paid $ 95,200,000
Escrow Deposited 5,400,000
Recorded Earnout Payable 8,700,000
Total Recorded Purchase Price 109,300,000
Maximum Potential Earnout Payable 35,000,000.0
Bollington Wilson Group [Member]  
Business Acquisition [Line Items]  
Cash Paid 328,000,000.0
Escrow Deposited 1,400,000
Total Recorded Purchase Price 329,400,000
LDJ American Online Benefits Group, LLC [Member]  
Business Acquisition [Line Items]  
Cash Paid 38,200,000
Escrow Deposited 7,100,000
Recorded Earnout Payable 14,800,000
Total Recorded Purchase Price 60,100,000
Maximum Potential Earnout Payable 20,000,000.0
Edelweiss Gallagher Insurance Brokers Limited [Member]  
Business Acquisition [Line Items]  
Cash Paid 35,700,000
Accrued Liability 5,300,000
Recorded Earnout Payable 8,500,000
Total Recorded Purchase Price 49,500,000
Maximum Potential Earnout Payable 9,900,000
Manchester Underwriting Agencies Limited [Member]  
Business Acquisition [Line Items]  
Cash Paid 33,000,000.0
Accrued Liability 3,900,000
Escrow Deposited 1,400,000
Recorded Earnout Payable 16,500,000
Total Recorded Purchase Price 54,800,000
Maximum Potential Earnout Payable 20,600,000
Willis Reinsurance Operations [Member]  
Business Acquisition [Line Items]  
Cash Paid 3,278,900,000
Recorded Earnout Payable 300,000,000.0
Total Recorded Purchase Price 3,578,900,000
Maximum Potential Earnout Payable $ 750,000,000.0
Thirty-Two Other Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 1,008
Common Share Value $ 149,900,000
Cash Paid 224,200,000
Accrued Liability 19,000,000.0
Escrow Deposited 30,100,000
Recorded Earnout Payable 66,300,000
Total Recorded Purchase Price 489,500,000
Maximum Potential Earnout Payable $ 133,900,000
2021 Acquisitions [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 1,008
Common Share Value $ 149,900,000
Cash Paid 4,033,200,000
Accrued Liability 28,200,000
Escrow Deposited 45,400,000
Recorded Earnout Payable 414,800,000
Total Recorded Purchase Price 4,671,500,000
Maximum Potential Earnout Payable $ 969,400,000