Restructuring Activities - Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve
Severance costs	$ 0.9	$ 1.9	$ 2.8	$ 2.8
Other restructuring costs	0.6	0.1	10.5	0.7
Restructuring costs	1.5	2.0	13.3	3.5
Cost of sales
Restructuring Cost and Reserve
Severance costs	0.8	0.0	1.8	0.2
Other restructuring costs	0.2	0.0	8.7	0.5
Selling, general, and administrative expenses
Restructuring Cost and Reserve
Severance costs	0.1	1.9	1.0	2.6
Other restructuring costs	$ 0.4	$ 0.1	$ 1.8	$ 0.2