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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)

X

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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