Inventory (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Inventory Disclosure [Abstract]
Cost of goods sold, amortization of operating materials		$ 1.3	$ 1.4
Fixed Production Overhead To Cost of Inventory	$ 1.5
Other Cost and Expense, Operating	1.5
Operating Expenses	$ 3.0