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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2025
USD ($)
Change in Contract with Customer, Liability [Roll Forward]  
Deferred revenue beginning balance $ 604.3
Incremental deferred revenue 396.2
Revenue recognized during the six-month period ended June 30, 2025 included in deferred revenue at December 31, 2024 (364.2)
Net change in collected billings/deposits received from customers 7.5
Impact of change in foreign exchange rates 37.6
Deferred revenue recognized from business acquisitions 13.1
Deferred revenue ending balance 694.5
Brokerage  
Change in Contract with Customer, Liability [Roll Forward]  
Deferred revenue beginning balance 430.9
Incremental deferred revenue 342.4
Revenue recognized during the six-month period ended June 30, 2025 included in deferred revenue at December 31, 2024 (317.1)
Net change in collected billings/deposits received from customers 13.8
Impact of change in foreign exchange rates 37.6
Deferred revenue recognized from business acquisitions 13.1
Deferred revenue ending balance 520.7
Risk Management  
Change in Contract with Customer, Liability [Roll Forward]  
Deferred revenue beginning balance 173.4
Incremental deferred revenue 53.8
Revenue recognized during the six-month period ended June 30, 2025 included in deferred revenue at December 31, 2024 (47.1)
Net change in collected billings/deposits received from customers (6.3)
Impact of change in foreign exchange rates 0.0
Deferred revenue recognized from business acquisitions 0.0
Deferred revenue ending balance $ 173.8