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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss [1]   $ 152.5 $ 101.9
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings   3.2 (3.1)
Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing   3.2 $ 3.0
Interest Rate Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings $ (1.1) $ (1.2)  
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 $ (1.3) $ 6.3  
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] $ 63.9 $ 179.3  
Commission revenue [Member] | Foreign Exchange Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss [1] (38.0) (26.8)  
Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing (0.1) (0.1)  
Compensation expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings $ (1.9) $ (1.1)  
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Compensation Compensation  
Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing $ 1.8 $ 1.9  
Operating expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings $ (1.4) $ (0.8)  
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Operating Operating  
Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing $ 1.3 $ 1.4  
[1] During 2023, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a gain of $0.4 million.