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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Deferred Revenue Arrangement [Line Items]    
Deferred revenue beginning balance $ 609.3 $ 579.6
Incremental deferred revenue 493.0 445.5
Revenue recognized (462.0) (430.9)
Net change in collected billings/deposits received from customers (13.0) 14.4
Impact of changes in foreign exchange rates (15.2) (17.9)
Deferred revenue recognized from business acquisitions 37.7 18.6
Deferred revenue ending balance 706.2 609.3
Brokerage [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue beginning balance 434.0 395.9
Incremental deferred revenue 386.3 342.3
Revenue recognized (358.4) (326.3)
Net change in collected billings/deposits received from customers (18.8) 21.4
Impact of changes in foreign exchange rates (15.2) (17.9)
Deferred revenue recognized from business acquisitions 37.7 18.6
Deferred revenue ending balance 533.6 434.0
Risk Management [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue beginning balance 175.3 183.7
Incremental deferred revenue 106.7 103.2
Revenue recognized (103.6) (104.6)
Net change in collected billings/deposits received from customers (5.8) (7.0)
Deferred revenue ending balance $ 172.6 $ 175.3