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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 918.5
Other comprehensive income before reclassifications			9.5
Amounts reclassified from AOCL			0.6
Total other comprehensive income/(loss)	$ 12.1	$ (12.8)	10.1	$ (16.1)
Ending Balance	925.5		925.5
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(74.4)
Ending Balance	(64.3)		(64.3)
Defined Benefit Pension Plan Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(9.3)
Other comprehensive income before reclassifications			0.0
Amounts reclassified from AOCL			0.6
Total other comprehensive income/(loss)			0.6
Ending Balance	(8.7)		(8.7)
Foreign Currency Translation Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(65.1)
Other comprehensive income before reclassifications			9.5
Amounts reclassified from AOCL			(0.0)
Total other comprehensive income/(loss)			9.5
Ending Balance	$ (55.6)		$ (55.6)

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