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Restructuring - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 48.2
Carrying values in excess of estimated fair values	2.8
Expected restructuring costs	20.0
Employee termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	38.6
Fixed asset impairment charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.8	$ 0.4
Contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.9
Other related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	5.9
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	40.8
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 7.4

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