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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2024
USD ($)
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance $ 706.2
Incremental deferred revenue 529.0
Revenue recognized during the nine-month period ended September 30, 2024 included in deferred revenue at December 31, 2023 (488.4)
Net change in collected billings/deposits received from customers 26.6
Impact of change in foreign exchange rates 15.5
Deferred revenue recognized from business acquisitions 10.4
Deferred revenue ending balance 746.1
Brokerage [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 533.6
Incremental deferred revenue 456.0
Revenue recognized during the nine-month period ended September 30, 2024 included in deferred revenue at December 31, 2023 (417.7)
Net change in collected billings/deposits received from customers 29.0
Impact of change in foreign exchange rates 15.0
Deferred revenue recognized from business acquisitions 10.4
Deferred revenue ending balance 568.3
Risk Management [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 172.6
Incremental deferred revenue 73.0
Revenue recognized during the nine-month period ended September 30, 2024 included in deferred revenue at December 31, 2023 (70.7)
Net change in collected billings/deposits received from customers 2.4
Impact of change in foreign exchange rates 0.5
Deferred revenue ending balance $ 177.8