Contingencies - Asbestos - Rollforward of number of plaintiffs - (Details) - lawsuit	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Approximate number of plaintiffs and claimants asbestos claims pending against the entity
Pending at beginning of year (in number of litigants)	1,070	1,330
Disposed (in number of litigants)	1,170	1,220
Filed (in number of litigants)	950	960
Pending at end of year (in number of litigants)	850	1,070