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Derivatives and Hedging Activity - Summary of Amounts of Derivative Gains (Losses) Recognized In Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss [1] $ (16.8) $ 101.9
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings (6.8) (3.1)
Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing 1.4 3.0
Interest Rate Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings $ (1.2) $ (1.1)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Interest
Foreign Exchange Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings $ (2.0) $ 1.3
Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing   $ (0.1)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Total revenues Total revenues
Interest expense [Member] | Interest Rate Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss [1] $ (6.1) $ 63.9
Commission revenue [Member] | Foreign Exchange Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss [1] (10.7) 38.0
Compensation expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings (2.2) (1.9)
Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing $ 0.8 $ 1.8
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Compensation Compensation
Operating expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings $ (1.4) $ (1.4)
Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing $ 0.6 $ 1.3
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Operating Operating
[1] During 2024, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a loss of $0.2 million.