Restructuring Activities - Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve
Severance costs	$ 0.3	$ 5.2
Other restructuring costs	0.4	0.0
Total restructuring costs	0.7	5.2
Cost of sales
Restructuring Cost and Reserve
Severance costs	0.0	2.3
Other restructuring costs	0.4	0.0
Selling, general, and administrative expenses
Restructuring Cost and Reserve
Severance costs	$ 0.3	$ 2.9

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Period Type:	duration