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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2023
USD ($)
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance $ 609.3
Incremental deferred revenue 477.2
Revenue recognized during the nine-month period ended September 30, 2023 included in deferred revenue at December 31, 2022 (429.6)
Net change in collected billings/deposits received from customers 16.8
Impact of change in foreign exchange rates (0.5)
Deferred revenue recognized from business acquisitions 22.4
Deferred revenue ending balance 695.6
Brokerage [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 434.0
Incremental deferred revenue 397.1
Revenue recognized during the nine-month period ended September 30, 2023 included in deferred revenue at December 31, 2022 (352.3)
Net change in collected billings/deposits received from customers 16.2
Impact of change in foreign exchange rates (0.5)
Deferred revenue recognized from business acquisitions 22.4
Deferred revenue ending balance 516.9
Risk Management [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 175.3
Incremental deferred revenue 80.1
Revenue recognized during the nine-month period ended September 30, 2023 included in deferred revenue at December 31, 2022 (77.3)
Net change in collected billings/deposits received from customers 0.6
Deferred revenue ending balance $ 178.7