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Stockholders' Equity - Schedule of Adjustments to Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Unrealized net gains (losses) on defined benefit pension plan | $ (165.1) | $ (117.2) | $ (119.6) | $ (3.7)
Unrealized gains (losses) on interest rate swaps | (165.1) | (117.2) | (119.6) | (3.7)
Other comprehensive (loss) income before reclassifications, Tax Effect | (6.1) | 4.2 | (5.4) | (1.1)
Defined Benefit Obligation [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Unrealized net gains (losses) on defined benefit pension plan |  |  |  | (0.1)
Reclassification of losses into net earnings on defined benefit pension, Tax Effect | 0.1 | 0.1 | 0.1 | 0.1
Unrealized gains (losses) on interest rate swaps |  |  |  | (0.1)
Foreign Currency Translation [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Unrealized net gains (losses) on defined benefit pension plan | (165.1) | (117.2) | (119.6) | (3.6)
Unrealized gains (losses) on interest rate swaps | (165.1) | (117.2) | (119.6) | (3.6)
Other comprehensive (loss) income before reclassifications, Tax Effect | $ (6.1) | $ 4.2 | $ (5.5) | $ (1.2)

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