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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 | 3 Months Ended | 6 Months Ended
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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.

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