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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2022
USD ($)
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance $ 579.6
Incremental deferred revenue 410.1
Revenue recognized during the nine-month period ended September 30, 2022 included in deferred revenue at December 31, 2021 (378.1)
Net change in collected billings/deposits received from customers (1.4)
Impact of change in foreign exchange rates (27.5)
Deferred revenue recognized from business acquisitions 5.1
Deferred revenue ending balance 587.8
Brokerage [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 395.9
Incremental deferred revenue 335.3
Revenue recognized during the nine-month period ended September 30, 2022 included in deferred revenue at December 31, 2021 (300.1)
Net change in collected billings/deposits received from customers 5.7
Impact of change in foreign exchange rates (27.4)
Deferred revenue recognized from business acquisitions 5.1
Deferred revenue ending balance 414.5
Risk Management [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 183.7
Incremental deferred revenue 74.8
Revenue recognized during the nine-month period ended September 30, 2022 included in deferred revenue at December 31, 2021 (78.0)
Net change in collected billings/deposits received from customers (7.1)
Impact of change in foreign exchange rates (0.1)
Deferred revenue ending balance $ 173.3