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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2021
USD ($)
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance $ 541.3
Incremental deferred revenue 360.7
Revenue recognized during the nine-month period ended September 30, 2021 included in deferred revenue at December 31, 2020 (333.3)
Net change in collected billings/deposits received from customers 8.8
Impact of change in foreign exchange rates 1.0
Deferred revenue recognized from business acquisitions 9.7
Deferred revenue ending balance 588.2
Brokerage [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 354.7
Incremental deferred revenue 283.3
Revenue recognized during the nine-month period ended September 30, 2021 included in deferred revenue at December 31, 2020 (256.5)
Net change in collected billings/deposits received from customers 1.5
Impact of change in foreign exchange rates 1.0
Deferred revenue recognized from business acquisitions 9.7
Deferred revenue ending balance 393.7
Risk Management [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 186.6
Incremental deferred revenue 77.4
Revenue recognized during the nine-month period ended September 30, 2021 included in deferred revenue at December 31, 2020 (76.8)
Net change in collected billings/deposits received from customers 7.3
Deferred revenue ending balance $ 194.5