Contingencies (Schedule of Changes in Claims) (Details) - Asbestos Litigation [Member] $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) claims	Dec. 31, 2019 USD ($) claims	Dec. 31, 2018 USD ($) claims	Dec. 31, 2017 USD ($) claims	Dec. 31, 2016 USD ($) claims	Dec. 31, 2015 USD ($) claims
Loss Contingencies [Line Items]
Opening Number of Claims	3,708	3,684	3,730	3,745	3,791	3,821
Claims Dismissed, Settled, or Resolved	36	51	152	105	148	116
New Claims	19	75	106	90	102	86
Closing Number of Claims	3,691	3,708	3,684	3,730	3,745	3,791
Amounts Paid (thousands) to Settle or Resolve | $	$ 47	$ 25	$ 100	$ 55	$ 758	$ 164