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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Deferred Revenue Arrangement [Line Items]    
Deferred revenue beginning balance $ 541.3 $ 503.8
Incremental deferred revenue 427.1 374.0
Revenue recognized during the year included in deferred revenue of prior year (399.6) (382.3)
Net change in collected billings/deposits received from customers (4.3) 25.6
Impact of changes in foreign exchange rates (4.5) 10.3
Deferred revenue recognized from business acquisitions 19.6 9.9
Deferred revenue ending balance 579.6 541.3
Brokerage [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue beginning balance 354.7 337.2
Incremental deferred revenue 325.0 282.7
Revenue recognized during the year included in deferred revenue of prior year (296.1) (283.1)
Net change in collected billings/deposits received from customers (3.6) (0.7)
Impact of changes in foreign exchange rates (3.7) 8.7
Deferred revenue recognized from business acquisitions 19.6 9.9
Deferred revenue ending balance 395.9 354.7
Risk Management [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue beginning balance 186.6 166.6
Incremental deferred revenue 102.1 91.3
Revenue recognized during the year included in deferred revenue of prior year (103.5) (99.2)
Net change in collected billings/deposits received from customers (0.7) 26.3
Impact of changes in foreign exchange rates (0.8) 1.6
Deferred revenue ending balance $ 183.7 $ 186.6