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Business Combinations - Acquisition Method for Recording Business Combinations (Detail)
shares in Thousands
 9 Months Ended
Sep. 30, 2019
USD ($)
shares
Business Acquisition [Line Items]  
Common Shares Issued | shares 608
Common Share Value $ 48,000,000.0
Cash Paid 964,400,000
Accrued Liability 38,300,000
Escrow Deposited 52,600,000
Recorded Earnout Payable 169,300,000
Total Recorded Purchase Price 1,272,600,000
Maximum Potential Earnout Payable $ 288,700,000
Inverson Holding Company - Company, LLC (IHC) [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 452
Common Share Value $ 35,900,000
Cash Paid 31,200,000
Escrow Deposited 4,500,000
Recorded Earnout Payable 20,900,000
Total Recorded Purchase Price 92,500,000
Maximum Potential Earnout Payable 35,000,000.0
James Brown Inc. (JBI) [Member]  
Business Acquisition [Line Items]  
Cash Paid 65,900,000
Escrow Deposited 8,700,000
Total Recorded Purchase Price 74,600,000
Limited SPG [Member]  
Business Acquisition [Line Items]  
Cash Paid 326,800,000
Escrow Deposited 4,800,000
Total Recorded Purchase Price 331,600,000
RPA Insurance Services LLC [Member]  
Business Acquisition [Line Items]  
Cash Paid 44,000,000.0
Escrow Deposited 3,900,000
Recorded Earnout Payable 16,900,000
Total Recorded Purchase Price 64,800,000
Maximum Potential Earnout Payable 22,000,000.0
JLT Aerospace [Member]  
Business Acquisition [Line Items]  
Cash Paid 162,800,000
Recorded Earnout Payable 63,600,000
Total Recorded Purchase Price 226,400,000
Maximum Potential Earnout Payable 75,100,000
RGA Group [Member]  
Business Acquisition [Line Items]  
Cash Paid 42,800,000
Accrued Liability 6,000,000.0
Escrow Deposited 4,700,000
Recorded Earnout Payable 8,000,000.0
Total Recorded Purchase Price 61,500,000
Maximum Potential Earnout Payable $ 9,300,000
Thirty Two Other Acquisition [Member]  
Business Acquisition [Line Items]  
Common Shares Issued | shares 156
Common Share Value $ 12,100,000
Cash Paid 290,900,000
Accrued Liability 32,300,000
Escrow Deposited 26,000,000.0
Recorded Earnout Payable 59,900,000
Total Recorded Purchase Price 421,200,000
Maximum Potential Earnout Payable $ 147,300,000