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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Deferred Revenue Arrangement [Line Items]    
Deferred revenue beginning balance $ 706.2 $ 609.3
Incremental deferred revenue 396.5 493.0
Revenue recognized (476.0) (462.0)
Net change in collected billings/deposits received from customers (44.6) 13.0
Impact of changes in foreign exchange rates (0.6) 15.2
Deferred revenue recognized from business acquisitions 22.8 37.7
Deferred revenue ending balance 604.3 706.2
Brokerage [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue beginning balance 533.6 434.0
Incremental deferred revenue 305.0 386.3
Revenue recognized (389.9) (358.4)
Net change in collected billings/deposits received from customers (40.3) 18.8
Impact of changes in foreign exchange rates (0.3) 15.2
Deferred revenue recognized from business acquisitions 22.8 37.7
Deferred revenue ending balance 430.9 533.6
Risk Management [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue beginning balance 172.6 175.3
Incremental deferred revenue 91.5 106.7
Revenue recognized (86.1) (103.6)
Net change in collected billings/deposits received from customers (4.3) (5.8)
Impact of changes in foreign exchange rates (0.3)  
Deferred revenue ending balance $ 173.4 $ 172.6