Derivatives and Hedging Activity - Summary of Amounts of Derivative Gains (Losses) Recognized In Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	[1]	$ (4.0)	$ 31.7	$ (6.7)	$ 37.5
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings		(2.1)	(1.0)	(3.0)	(1.5)
Amount of Gain Recognized in Earnings Related to Amount Excluded from Effectiveness Testing		0.4	0.7	0.9	1.7
Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings		$ (0.3)	$ (0.3)	$ (0.6)	$ (0.6)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]		Interest Expense, Operating and Nonoperating	Interest Expense, Operating and Nonoperating	Interest Expense, Operating and Nonoperating	Interest Expense, Operating and Nonoperating
Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings		$ (1.0)	$ 0.2	$ (0.8)	$ 0.8
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]		Revenue from Contract with Customer, Excluding Assessed Tax	Revenue from Contract with Customer, Excluding Assessed Tax	Revenue from Contract with Customer, Excluding Assessed Tax	Revenue from Contract with Customer, Excluding Assessed Tax
Interest expense [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	[1]	$ (3.6)	$ 18.9	$ (2.9)	$ 8.8
Commission revenue [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	[1]	(0.4)	12.8	(3.8)	28.7
Compensation expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings		(0.4)	(0.5)	(0.9)	(1.0)
Amount of Gain Recognized in Earnings Related to Amount Excluded from Effectiveness Testing		$ 0.2	$ 0.4	$ 0.5	$ 1.0
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]		Labor and Related Expense	Labor and Related Expense	Labor and Related Expense	Labor and Related Expense
Operating expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings		$ (0.4)	$ (0.4)	$ (0.7)	$ (0.7)
Amount of Gain Recognized in Earnings Related to Amount Excluded from Effectiveness Testing		$ 0.2	$ 0.3	$ 0.4	$ 0.7
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]		Operating Expenses	Operating Expenses	Operating Expenses	Operating Expenses

[1] For the three and six-month periods ended June 30, 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 $0.1 million and a gain of $0.2 million, respectively. For the three and six-month periods ended June 30, 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 $0.3 million and $0.8 million, respectively.