Restructuring (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017	Dec. 31, 2017
Restructuring
Net pre-tax restructuring charges	$ 3.4	$ 1.4	$ 3.4	$ 3.6
Costs incurred	3.4	1.4	3.4	3.6
Americas
Restructuring
Net pre-tax restructuring charges		0.7		2.6
Europe
Restructuring
Net pre-tax restructuring charges	3.4	0.5	3.4	0.6
APMEA
Restructuring
Net pre-tax restructuring charges		0.2		0.4
2015 Actions
Restructuring
Net pre-tax restructuring charges		0.5		2.1
2018 Actions | Europe
Restructuring
Pre-tax program to date restructuring and other charges incurred	4.4		4.4
Total expected restructuring costs	5.0		5.0
Restructuring reserve	3.7		3.7
Other Actions
Restructuring
Net pre-tax restructuring charges	3.4	$ 0.9	3.4	$ 1.5
Restructuring reserve	0.2		0.2
Other Actions | Europe
Restructuring
Total expected restructuring costs	$ 3.4		$ 3.4		$ 4.1