Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period				$ (130.8)
Balance at the end of the period	$ (100.0)				$ (130.8)
Foreign Currency Translation
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(123.5)	$ (137.8)	$ (147.8)	(131.3)	(143.2)	$ (127.4)	$ (130.9)	$ (126.3)
Change in period	23.6	14.3	10.0	(16.5)	11.9	(15.8)	3.5	(4.6)
Balance at the end of the period	(99.9)	(123.5)	(137.8)	(147.8)	(131.3)	(143.2)	(127.4)	(130.9)
Cash Flow Hedge
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(0.6)	(0.7)	(0.4)	0.5	1.0	1.5	3.9	5.2
Change in period	0.5	0.1	(0.3)	(0.9)	(0.5)	(0.5)	(2.4)	(1.3)
Balance at the end of the period	(0.1)	(0.6)	(0.7)	(0.4)	0.5	1.0	1.5	3.9
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(124.1)	(138.5)	(148.2)	(130.8)	(142.2)	(125.9)	(127.0)	(121.1)
Change in period	24.1	14.4	9.7	(17.4)	11.4	(16.3)	1.1	(5.9)
Balance at the end of the period	$ (100.0)	$ (124.1)	$ (138.5)	$ (148.2)	$ (130.8)	$ (142.2)	$ (125.9)	$ (127.0)