Pension (Assumptions Used) (Details) - Pension Plan	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. Plans
Assumptions Used Determine Net Periodic Pension Costs:
Expected long-term rate of return on plan assets	7.00%	7.25%	7.25%
U.S. Plans | Minimum
Assumptions Used Determine Benefit Obligation:
Discount rate	3.64%	4.18%
Assumptions Used Determine Net Periodic Pension Costs:
Discount rate	4.18%	4.66%	4.17%
U.S. Plans | Maximum
Assumptions Used Determine Benefit Obligation:
Discount rate	3.69%	4.23%
Assumptions Used Determine Net Periodic Pension Costs:
Discount rate	4.23%	4.73%	4.29%
Non-U.S. Plans
Assumptions Used Determine Benefit Obligation:
Discount rate	9.40%	9.30%
Rate of compensation increase	4.30%	4.30%
Assumptions Used Determine Net Periodic Pension Costs:
Discount rate	9.30%	8.10%
Expected long-term rate of return on plan assets			4.00%
Rate of compensation increase	4.30%	4.30%
Non-U.S. Plans | Minimum
Assumptions Used Determine Net Periodic Pension Costs:
Discount rate			2.30%
Rate of compensation increase			2.00%
Non-U.S. Plans | Maximum
Assumptions Used Determine Net Periodic Pension Costs:
Discount rate			7.60%
Rate of compensation increase			4.30%