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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2020
USD ($)
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance $ 503.8
Incremental deferred revenue 312.5
Revenue recognized during the nine-month period ended September 30, 2020 included in deferred revenue at December 31, 2019 (313.7)
Net change in collected billings/deposits received from customers 26.3
Impact of change in foreign exchange rates (1.9)
Deferred revenue recognized from business acquisitions 4.4
Deferred revenue ending balance 531.4
Brokerage [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 337.2
Incremental deferred revenue 244.5
Revenue recognized during the nine-month period ended September 30, 2020 included in deferred revenue at December 31, 2019 (237.1)
Net change in collected billings/deposits received from customers (1.9)
Impact of change in foreign exchange rates (1.7)
Deferred revenue recognized from business acquisitions 4.4
Deferred revenue ending balance 345.4
Risk Management [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 166.6
Incremental deferred revenue 68.0
Revenue recognized during the nine-month period ended September 30, 2020 included in deferred revenue at December 31, 2019 (76.6)
Net change in collected billings/deposits received from customers 28.2
Impact of change in foreign exchange rates (0.2)
Deferred revenue ending balance $ 186.0