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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance $ 541.3
Incremental deferred revenue 214.7
Revenue recognized during the three-month period ended March 31, 2021 included in deferred revenue at December 31, 2020 (192.9)
Net change in collected billings/deposits received from customers 16.1
Impact of change in foreign exchange rates 4.4
Deferred revenue recognized from business acquisitions 7.1
Deferred revenue ending balance 590.7
Brokerage [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 354.7
Incremental deferred revenue 188.3
Revenue recognized during the three-month period ended March 31, 2021 included in deferred revenue at December 31, 2020 (167.6)
Net change in collected billings/deposits received from customers 5.6
Impact of change in foreign exchange rates 4.1
Deferred revenue recognized from business acquisitions 7.1
Deferred revenue ending balance 392.2
Risk Management [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 186.6
Incremental deferred revenue 26.4
Revenue recognized during the three-month period ended March 31, 2021 included in deferred revenue at December 31, 2020 (25.3)
Net change in collected billings/deposits received from customers 10.5
Impact of change in foreign exchange rates 0.3
Deferred revenue ending balance $ 198.5