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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2023
USD ($)
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance $ 609.3
Incremental deferred revenue 299.1
Revenue recognized during the three-month period ended March 31, 2023 included in deferred revenue at December 31, 2022 (237.2)
Net change in collected billings/deposits received from customers 12.1
Impact of change in foreign exchange rates 2.1
Deferred revenue recognized from business acquisitions 2.8
Deferred revenue ending balance 688.2
Brokerage [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 434.0
Incremental deferred revenue 273.2
Revenue recognized during the three-month period ended March 31, 2023 included in deferred revenue at December 31, 2022 (211.9)
Net change in collected billings/deposits received from customers 15.3
Impact of change in foreign exchange rates 2.6
Deferred revenue recognized from business acquisitions 2.8
Deferred revenue ending balance 516.0
Risk Management [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 175.3
Incremental deferred revenue 25.9
Revenue recognized during the three-month period ended March 31, 2023 included in deferred revenue at December 31, 2022 (25.3)
Net change in collected billings/deposits received from customers (3.2)
Impact of change in foreign exchange rates (0.5)
Deferred revenue ending balance $ 172.2