Restructuring Activities - Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve
Severance costs	$ 0.0	$ 3.5	$ 0.3	$ 8.7
Other restructuring costs	0.3	2.1	0.7	2.1
Total restructuring costs	0.3	5.6	1.0	10.8
Cost of sales
Restructuring Cost and Reserve
Severance costs	0.0	1.6	0.0	3.9
Other restructuring costs	0.3	0.0	0.7	0.0
Selling, general, and administrative expenses
Restructuring Cost and Reserve
Severance costs	0.0	1.9	0.3	4.8
Other restructuring costs	$ 0.0	$ 2.1	$ 0.0	$ 2.1