Restructuring Charges (Number of Positions Eliminated Rollfoward) (Details) - employee	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Restructuring and Related Cost, Number of Positions Eliminated [Roll Forward]
Planned reductions - January 1	69	47
Additional planned reductions	621	176
Actual reductions and reversals	(465)	(135)
Planned reductions - September 30	225	88