Income Taxes - Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	35.00%	35.00%
Increase (decrease) in tax rate resulting from:
State income taxes (net of federal income tax benefit)	1.00%	0.70%	1.70%
Foreign income taxed at different rates than U.S. statutory rate	0.80%	(5.30%)	(5.40%)
Separation related adjustments for final resolution of uncertain tax positions	0.00%	0.00%	(2.30%)
U.S. federal permanent differences related to the TCJA	(4.80%)	(2.90%)	(2.60%)
Compensation related	(1.50%)	(1.70%)	0.00%
Other	(0.50%)	(1.60%)	0.30%
Effective income tax rate before adjustments related to the 2017 TCJA provisional estimates	16.00%	24.20%	26.70%
Deferred tax revaluation	(1.30%)	(19.20%)	0.00%
Transition tax	0.10%	12.60%	0.00%
Total adjustments related to the 2017 TCJA provisional estimates	(1.20%)	(6.60%)	0.00%
Effective income tax rate after adjustments related to the 2017 TCJA provisional estimates	14.80%	17.60%	26.70%