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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2021
USD ($)
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance $ 541.3
Incremental deferred revenue 307.3
Revenue recognized during the six-month period ended June 30, 2021 included in deferred revenue at December 31, 2020 (277.4)
Net change in collected billings/deposits received from customers 6.5
Impact of change in foreign exchange rates 5.8
Deferred revenue recognized from business acquisitions 8.6
Deferred revenue ending balance 592.1
Brokerage [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 354.7
Incremental deferred revenue 256.2
Revenue recognized during the six-month period ended June 30, 2021 included in deferred revenue at December 31, 2020 (226.0)
Net change in collected billings/deposits received from customers (0.2)
Impact of change in foreign exchange rates 5.5
Deferred revenue recognized from business acquisitions 8.6
Deferred revenue ending balance 398.8
Risk Management [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 186.6
Incremental deferred revenue 51.1
Revenue recognized during the six-month period ended June 30, 2021 included in deferred revenue at December 31, 2020 (51.4)
Net change in collected billings/deposits received from customers 6.7
Impact of change in foreign exchange rates 0.3
Deferred revenue ending balance $ 193.3