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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance $ 706.2
Incremental deferred revenue 339.6
Revenue recognized during the three-month period ended March 31, 2024 included in deferred revenue at December 31, 2023 (268.2)
Net change in collected billings/deposits received from customers 10.9
Impact of change in foreign exchange rates (7.3)
Deferred revenue recognized from business acquisitions 4.1
Deferred revenue ending balance 785.3
Brokerage [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 533.6
Incremental deferred revenue 322.4
Revenue recognized during the three-month period ended March 31, 2024 included in deferred revenue at December 31, 2023 (252.2)
Net change in collected billings/deposits received from customers 8.4
Impact of change in foreign exchange rates (6.8)
Deferred revenue recognized from business acquisitions 4.1
Deferred revenue ending balance 609.5
Risk Management [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 172.6
Incremental deferred revenue 17.2
Revenue recognized during the three-month period ended March 31, 2024 included in deferred revenue at December 31, 2023 (16.0)
Net change in collected billings/deposits received from customers 2.5
Impact of change in foreign exchange rates (0.5)
Deferred revenue ending balance $ 175.8