Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) reporting_unit	Mar. 31, 2019	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
Interest trade receivable percentage	100.00%
Trade receivables | $	$ 40.0		$ 15.0
Percentage of LIFO inventory		40.00%	50.00%
Number of reporting units | reporting_unit	10