Inventory (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
Inventory Disclosure [Abstract]
Cost of goods sold, amortization of operating materials		$ 0.8	$ 1.1
Fixed Production Overhead To Cost of Inventory	$ 2.1
Other Cost and Expense, Operating	1.5
Operating Expenses	$ 3.6