Revision of Previously Reported Financial Information - Condensed Consolidated Statements of Comprehensive (Loss) Income (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 29, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 29, 2018	Sep. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Currency translation adjustment	$ 5.1	$ 8.3	$ 3.9	$ (8.7)	$ (3.6)	$ 26.1
Total other comprehensive income	$ (0.6)	21.4	$ 4.2	3.9	$ 3.3	$ 25.2
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Currency translation adjustment		18.6		1.6
Total other comprehensive income		31.7		14.2
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Currency translation adjustment		(10.3)		(10.3)
Total other comprehensive income		$ (10.3)		$ (10.3)