Restructuring Activities Restructuring Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 4.6	$ 10.0	$ 7.4
Other Restructuring Costs	11.0	0.9	4.8
Restructuring Costs	15.6	10.9	12.2
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	0.8	4.2	2.2
Other Restructuring Costs	4.4	0.2	1.4
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	3.8	5.8	5.2
Other Restructuring Costs	$ 6.6	$ 0.7	$ 3.4