Restructuring Expenses (Details) $ in Millions	3 Months Ended				9 Months Ended		36 Months Ended
	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) employees	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) employees
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, headcount reduction (approximately) | employees					440		2,750
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of period	$ 13.4	$ 14.6	$ 15.3		$ 15.3
Restructuring expenses	3.0	0.4	5.1	$ 1.5	8.5	$ 5.5
Restructuring non-cash expense			(0.2)
Restructuring Costs			4.9
Restructuring cash activity	(3.1)	(2.5)	(5.8)
Foreign currency translation	0.2	0.9	0.2
Restructuring reserve, end of period	13.5	13.4	14.6		13.5		$ 15.3
Write-down Of Property, Plant And Equipment [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of period	0.0	0.0	0.0		0.0
Restructuring expenses	0.0	0.0	0.2
Restructuring non-cash expense			(0.2)
Restructuring Costs			0.0
Restructuring cash activity	0.0	0.0	0.0
Foreign currency translation	0.0	0.0	0.0
Restructuring reserve, end of period	0.0	0.0	0.0		0.0		0.0
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of period	13.4	14.6	14.5		14.5
Restructuring expenses	3.0	0.4	4.9
Restructuring non-cash expense			0.0
Restructuring Costs			4.9
Restructuring cash activity	(3.1)	(2.5)	(5.0)
Foreign currency translation	0.2	0.9	0.2
Restructuring reserve, end of period	13.5	13.4	14.6		13.5		14.5
Facility Closing Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of period	0.0	0.0	0.8		0.8
Restructuring expenses	0.0	0.0	0.0
Restructuring non-cash expense			0.0
Restructuring Costs			0.0
Restructuring cash activity	0.0	0.0	(0.8)
Foreign currency translation	0.0	0.0	0.0
Restructuring reserve, end of period	$ 0.0	$ 0.0	$ 0.0		$ 0.0		$ 0.8