v3.8.0.1
Income Taxes Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Statutory federal income tax rate 35.00% 35.00% 35.00%
Increase (decrease) in tax rate resulting from:      
State income taxes (net of federal income tax benefit) 0.70% 1.70% 1.80%
Foreign income taxed at lower rate than U.S. statutory rate (5.00%) (4.70%) (4.60%)
Separation related adjustments for final resolution of uncertain tax positions 0.00% (1.90%) 0.00%
Research and experimentation credits and federal domestic production deduction (2.90%) (2.50%) (2.10%)
Other (3.60%) (0.50%) 1.90%
Effective income tax rate prior to the impact of the TCJA 24.20% 27.10% 32.00%
Deferred Tax Revaluation (16.00%) 0.00% 0.00%
Transition Tax 10.50% 0.00% 0.00%
Total provisional estimates related to the TCJA (5.50%) 0.00% 0.00%
Estimated effective income tax rate including provisional estimates of the TCJA 18.70% 27.10% 32.00%