Restructuring (Restructuring Activity) (Details) - November 2015 Restructuring Program - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]
Total expected restructuring charges	$ 110.0		$ 110.0
Restructuring Reserve [Roll Forward]
Balance, December 31, 2016			19.2
Net provisions			31.3
Net benefits (provisions) charged against net assets			(2.5)
Payments			(45.1)
Foreign currency translation			0.7
Balance, September 29, 2017	3.6		3.6
Total aggregate costs to date			105.7
Employee Separation Costs
Restructuring Cost and Reserve [Line Items]
Total expected restructuring charges	17.0		17.0
Restructuring Reserve [Roll Forward]
Balance, December 31, 2016			5.9
Net provisions	0.2	$ 3.3	3.3	$ 5.7
Net benefits (provisions) charged against net assets			0.0
Payments			(6.9)
Foreign currency translation			0.2
Balance, September 29, 2017	2.5		2.5
Total aggregate costs to date			16.0
Asset-Related Costs
Restructuring Cost and Reserve [Line Items]
Total expected restructuring charges	25.0		25.0
Restructuring Reserve [Roll Forward]
Balance, December 31, 2016			0.0
Net provisions			2.3
Net benefits (provisions) charged against net assets			(2.3)
Payments			0.0
Foreign currency translation			0.0
Balance, September 29, 2017	0.0		0.0
Total aggregate costs to date		12.9	23.6	14.3
Other Cost
Restructuring Cost and Reserve [Line Items]
Total expected restructuring charges	68.0		68.0
Restructuring Reserve [Roll Forward]
Balance, December 31, 2016			13.3
Net provisions	5.6	$ 7.2	25.7	$ 19.8
Net benefits (provisions) charged against net assets			(0.2)
Payments			(38.2)
Foreign currency translation			0.5
Balance, September 29, 2017	$ 1.1		1.1
Total aggregate costs to date			$ 66.1