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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2023
USD ($)
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance $ 609.3
Incremental deferred revenue 446.2
Revenue recognized during the six-month period ended June 30, 2023 included in deferred revenue at December 31, 2022 (376.9)
Net change in collected billings/deposits received from customers 3.0
Impact of change in foreign exchange rates 16.9
Deferred revenue recognized from business acquisitions 20.0
Deferred revenue ending balance 718.5
Brokerage [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 434.0
Incremental deferred revenue 393.6
Revenue recognized during the six-month period ended June 30, 2023 included in deferred revenue at December 31, 2022 (325.6)
Net change in collected billings/deposits received from customers 7.0
Impact of change in foreign exchange rates 16.9
Deferred revenue recognized from business acquisitions 20.0
Deferred revenue ending balance 545.9
Risk Management [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 175.3
Incremental deferred revenue 52.6
Revenue recognized during the six-month period ended June 30, 2023 included in deferred revenue at December 31, 2022 (51.3)
Net change in collected billings/deposits received from customers (4.0)
Deferred revenue ending balance $ 172.6