Benefit Plans and Other Postretirement Benefits, Weighted-average assumptions (Details) - Pension Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
United States
Weighted-average assumptions used to determine benefit obligations
Benefit obligation discount rate (as a percent)	4.14%	3.48%
Increase (decrease) in benefit obligation due to change in discount rate	$ 35.0
Foreign.
Weighted-average assumptions used to determine benefit obligations
Benefit obligation discount rate (as a percent)	2.28%	2.21%