Restructuring - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 91.0
Carrying values in excess of estimated fair values	3.6
Expected restructuring costs	65.0
Employee termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	81.4
Fixed asset impairment charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3.6	$ 1.6
Contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.0
Other related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4.0
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	83.2
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 7.8