Restructuring Activities - Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve
Severance costs	$ 1.5	$ 0.5
Other restructuring costs	5.9	0.4
Restructuring costs	7.4	0.9
Cost of sales
Restructuring Cost and Reserve
Severance costs	0.5	0.0
Other restructuring costs	5.0	0.3
Selling, general, and administrative expenses
Restructuring Cost and Reserve
Severance costs	1.0	0.5
Other restructuring costs	$ 0.9	$ 0.1