Income Taxes (Effective Income Tax Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. federal corporate tax rate	35.00%	35.00%	35.00%
Tax on international operations less than U.S. tax rate	(4.50%)	(2.90%)	(5.10%)
Reversal of prior valuation allowance	(0.50%)	(0.30%)	0.00%
Reversal of reserves for unrecognized tax benefits	(0.20%)	(0.60%)	(1.60%)
U.S. tax on international earnings, net of foreign tax credits	0.10%	1.30%	4.60%
State income taxes, net of federal tax effect	0.20%	0.80%	0.30%
U.S. research and development credits	(0.80%)	(0.80%)	(1.30%)
Excess tax benefits on share-based payments	(14.10%)	0.00%	0.00%
Impact of 2017 Tax Act	15.90%	0.00%	0.00%
Tax on undistributed earnings of subsidiaries	4.40%	0.00%	0.00%
Venezuela deconsolidation	1.70%	0.00%	0.00%
Other business credits and Section 199 Deduction	(0.60%)	1.10%	1.30%
Other	(0.20%)	(0.10%)	1.20%
Effective tax rate	36.40%	28.70%	22.60%