Restructuring and Restructuring Related Charges (Summary Of Restructuring-Related Costs) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Severance and other restructuring costs	$ 8.1	$ 7.8	$ 0.8
Inventory obsolescence and other	(0.5)	4.6	0.5
Total restructuring and restructuring-related costs	7.6	12.4	1.3
Amount of total that represents cash charges	$ 8.1	$ 7.8	$ 0.8

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
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: 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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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Period Type:	duration