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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2020
USD ($)
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance $ 503.8
Incremental deferred revenue 307.8
Revenue recognized during the six-month period ended June 30, 2020 included in deferred revenue at December 31, 2019 (289.8)
Impact of change in foreign exchange rates (6.2)
Deferred revenue recognized from business acquisitions 4.0
Deferred revenue ending balance 519.6
Brokerage [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 337.2
Incremental deferred revenue 230.4
Revenue recognized during the six-month period ended June 30, 2020 included in deferred revenue at December 31, 2019 (214.2)
Impact of change in foreign exchange rates (6.2)
Deferred revenue recognized from business acquisitions 4.0
Deferred revenue ending balance 351.2
Risk Management [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred revenue beginning balance 166.6
Incremental deferred revenue 77.4
Revenue recognized during the six-month period ended June 30, 2020 included in deferred revenue at December 31, 2019 (75.6)
Deferred revenue ending balance $ 168.4