Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			$ (99.1)
Balance at the end of the period	$ (109.8)
Foreign Currency Translation
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(119.5)	$ (92.9)	(102.6)	$ (124.3)	$ (145.8)	$ (153.7)
Change in period	2.5	(26.6)	9.7	15.4	21.5	7.9
Balance at the end of the period	(117.0)	(119.5)	(92.9)	(108.9)	(124.3)	(145.8)
Cash Flow Hedges
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	7.3	6.3	3.5	2.3	3.0	2.9
Change in period	(0.1)	1.0	2.8	0.1	(0.7)	0.1
Balance at the end of the period	7.2	7.3	6.3	2.4	2.3	3.0
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(112.2)	(86.6)	(99.1)	(122.0)	(142.8)	(150.8)
Change in period	2.4	(25.6)	12.5	15.5	20.8	8.0
Balance at the end of the period	$ (109.8)	$ (112.2)	$ (86.6)	$ (106.5)	$ (122.0)	$ (142.8)