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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 944.4	$ (74.4)
Other comprehensive income before reclassifications			(14.5)	9.5
Amounts reclassified from AOCL			1.9	0.6
Total other comprehensive income/(loss)	$ (6.4)	$ 12.1	(12.6)	10.1
Ending Balance	992.5	(64.3)	992.5	(64.3)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(57.3)
Ending Balance	(69.9)		(69.9)
Defined Benefit Pension Plan Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(19.9)	(9.3)
Other comprehensive income before reclassifications			0.0	0.0
Amounts reclassified from AOCL			1.9	0.6
Total other comprehensive income/(loss)			1.9	0.6
Ending Balance	(18.0)	(8.7)	(18.0)	(8.7)
Foreign Currency Translation Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(37.4)	(65.1)
Other comprehensive income before reclassifications			(14.5)	9.5
Amounts reclassified from AOCL			(0.0)	(0.0)
Total other comprehensive income/(loss)			(14.5)	9.5
Ending Balance	$ (51.9)	$ (55.6)	$ (51.9)	$ (55.6)

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