Shareholders' Deficit - Summary of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (1,150.4)		$ (1,415.4)		$ (1,265.9)		$ (1,391.5)
Amounts reclassified from accumulated other comprehensive loss to income, net of tax	1.4	[1]	1.0	[1]	5.8	[2]	1.1	[2]
Total other comprehensive loss	(15.1)		(41.2)		(2.9)		(72.5)
Ending balance	(1,103.5)		(1,361.9)		(1,103.5)		(1,361.9)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(233.4)		(239.1)		(248.2)		(211.6)
Other comprehensive loss before reclassifications, net of tax	(15.5)		(39.6)		(0.7)		(67.1)
Amounts reclassified from accumulated other comprehensive loss to income, net of tax	0.0	[1]	0.0	[1]	0.0	[2]	0.0	[2]
Total other comprehensive loss	(15.5)		(39.6)		(0.7)		(67.1)
Ending balance	(248.9)		(278.7)		(248.9)		(278.7)
Unrealized (Loss) Gain on Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(4.6)		(4.0)		(2.0)		(0.2)
Other comprehensive loss before reclassifications, net of tax	(1.0)		(2.6)		8.0		(6.5)
Amounts reclassified from accumulated other comprehensive loss to income, net of tax	1.4	[1]	1.0	[1]	5.8	[2]	1.1	[2]
Total other comprehensive loss	0.4		(1.6)		(2.2)		(5.4)
Ending balance	(4.2)		(5.6)		(4.2)		(5.6)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(238.0)		(243.1)		(250.2)		(211.8)
Other comprehensive loss before reclassifications, net of tax	(16.5)		(42.2)		(8.7)		(73.6)
Total other comprehensive loss	(15.1)		(41.2)		(2.9)		(72.5)
Ending balance	$ (253.1)		$ (284.3)		$ (253.1)		$ (284.3)

[1] See Note 9, Derivative Instruments and Hedging Activities, for information regarding the location within the condensed consolidated statements of income of gains (losses) reclassified from accumulated other comprehensive loss to income during the three months ended September 30, 2023 and 2022.

[2] See Note 9, Derivative Instruments and Hedging Activities, for information regarding the location within the condensed consolidated statements of income of gains (losses) reclassified from accumulated other comprehensive loss to income during the nine months ended September 30, 2023 and 2022.