Accumulated Other Comprehensive (Loss) Income - Changes by Component (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
AOCI Attributable to Parent
Beginning Balance	$ 1,348.2	$ 1,139.9	$ 1,166.2	$ 1,170.4
OCI before reclassifications	(4.8)	(3.9)	(23.8)	5.9
Amounts reclassified from AOCI	0.0	2.1	(2.5)	6.4
Net current-period OCI	(4.8)	(1.8)	(26.3)	12.3
Ending Balance	1,361.6	1,141.9	1,361.6	1,141.9
Gains and Losses on Derivative Instruments
AOCI Attributable to Parent
Beginning Balance	0.0	(2.7)	11.2	(9.7)
OCI before reclassifications	0.0	(3.1)	(8.7)	(0.4)
Amounts reclassified from AOCI	0.0	2.1	(2.5)	6.4
Net current-period OCI	0.0	(1.0)	(11.2)	6.0
Ending Balance	0.0	(3.7)	0.0	(3.7)
Pension Benefit Plan Items
AOCI Attributable to Parent
Beginning Balance	(1.0)	0.3	(1.0)	0.3
OCI before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified from AOCI	0.0	0.0	0.0	0.0
Net current-period OCI	0.0	0.0	0.0	0.0
Ending Balance	(1.0)	0.3	(1.0)	0.3
Currency Translation Adjustment Items
AOCI Attributable to Parent
Beginning Balance	(89.0)	(85.2)	(78.7)	(92.3)
OCI before reclassifications	(4.8)	(0.8)	(15.1)	6.3
Amounts reclassified from AOCI	0.0	0.0	0.0	0.0
Net current-period OCI	(4.8)	(0.8)	(15.1)	6.3
Ending Balance	(93.8)	(86.0)	(93.8)	(86.0)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent
Beginning Balance	(90.0)	(87.6)	(68.5)	(101.7)
Ending Balance	$ (94.8)	$ (89.4)	$ (94.8)	$ (89.4)