Commitments and Contingencies - Asbestos Claimant and Settlement (Details) - Asbestos [Member]	12 Months Ended
	Dec. 31, 2018 USD ($) claimants	Dec. 31, 2017 USD ($) claimants	Dec. 31, 2016 USD ($) claimants	Dec. 31, 2015 claimants
Loss Contingencies [Line Items]
Number of pending claims filed during period	171	173	140
Number of pending claims dismissed during period	564	231	1,009
Number of pending claims settled during period	43	25	34
Number of pending claims	4,820	5,256	5,339	6,242
Average settlement amount per claim during period | $	$ 7,191	$ 8,930	$ 15,624
Total defense costs during period | $	$ 2,260,000	$ 2,280,000	$ 2,920,000