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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 944.4
Other comprehensive income before reclassifications			(7.5)	$ (2.4)
Amounts reclassified from AOCL			1.3	0.4
Total other comprehensive income/(loss)	$ 4.4	$ 5.9	(6.2)	(2.0)
Ending Balance	973.6		973.6
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(57.3)	(74.4)
Ending Balance	(63.5)	(76.4)	(63.5)	(76.4)
Defined Benefit Pension Plan Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(15.9)	(9.3)
Other comprehensive income before reclassifications			0.0	0.0
Amounts reclassified from AOCL			1.3	0.4
Total other comprehensive income/(loss)			1.3	0.4
Ending Balance	(14.6)	(8.9)	(14.6)	(8.9)
Foreign Currency Translation Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(41.4)	(65.1)
Other comprehensive income before reclassifications			(7.5)	(2.4)
Amounts reclassified from AOCL			(0.0)	(0.0)
Total other comprehensive income/(loss)			(7.5)	(2.4)
Ending Balance	$ (48.9)	$ (67.5)	$ (48.9)	$ (67.5)

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