Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 168.8	$ 147.2	$ 439.4	$ 232.1
Changes in other comprehensive income, net of tax:
Foreign currency translation adjustments	0.0	13.1	(13.4)	31.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(0.6)	(0.6)	(1.8)	(1.5)
Unrealized foreign exchange loss on intercompany loan, net of tax effect of zero and ($0.4) for three months ended, respectively, and $0.3 and ($1.0) for the nine months ended, respectively	0.0	1.3	(1.3)	3.9
Total other comprehensive (loss) income	(0.6)	13.8	(16.5)	33.6
Total comprehensive income	$ 168.2	$ 161.0	$ 422.9	$ 265.7