Employee Benefit Plans Employee Benefit Plans (Defined Benefit Other Plans) (Details) - Other Postretirement Benefits Plan - Penreco Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Accrued Benefit Obligation	$ 0.2	$ 0.2
Other Post-retirement benefit income	$ 0.0	$ 0.0