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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss | [1] | $ 31.7 | $ 36.8 | $ 37.5 | $ 97.3
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings |  | (1.0) | (0.3) | (1.5) | (1.2)
Amount of Gain Recognized in Earnings Related to Amount Excluded from Effectiveness Testing |  | 0.7 | 0.9 | 1.7 | 1.4
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 | Interest Expense | Interest Expense | Interest Expense
Foreign Exchange Contracts [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings |  | $ 0.2 | $ 0.1 | $ 0.8 | $ (0.2)
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] | $ 18.9 | $ 68.5 | $ 8.8 | $ 135.5
Commission revenue [Member] | Foreign Exchange Contracts [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss | [1] | 12.8 | (31.7) | 28.7 | (38.2)
Compensation expense [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings |  | (0.5) | 0.0 | (1.0) | (0.2)
Amount of Gain Recognized in Earnings Related to Amount Excluded from Effectiveness Testing |  | 0.4 | 0.5 | 1.0 | 0.8
Operating expense [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings |  | (0.4) | (0.1) | (0.7) | (0.2)
Amount of Gain Recognized in Earnings Related to Amount Excluded from Effectiveness Testing |  | $ 0.3 | $ 0.4 | $ 0.7 | $ 0.6
[1] | 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. For the three and six-month periods ended June 30, 2022, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a gain of $1.2 million and $0.5, respectively.

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