Income Taxes - Differences Between U.S. Federal Statutory Income Tax Rate and Effective Tax Rate on Income Before Income Taxes (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory tax rate	21.00%	35.00%	35.00%
State income taxes, net of federal benefit	0.00%	3.60%	2.30%
Effect of non-U.S. operations	(10.60%)	5.90%	(6.10%)
Change in the reserve for tax contingencies	15.70%	(2.80%)	3.20%
Law changes	(1.30%)	41.80%	0.00%
Stock-based compensation expense	(5.30%)	11.00%	(3.80%)
Nondeductible acquisition costs	0.90%	(7.90%)	2.60%
Nondeductible meals and entertainment costs	2.70%	(3.50%)	1.10%
Gains/Losses on divested operations and held-for-sale assets	12.20%	13.10%	0.00%
Limitation on executive compensation	2.70%	(0.10%)	0.00%
Foreign-derived intangible income	(2.00%)	0.00%	0.00%
Change in the valuation allowance	0.50%	3.00%	(0.20%)
Goodwill	(3.80%)	(0.00%)	(0.00%)
Other items, net	(0.30%)	3.50%	(1.20%)
Effective tax rate	32.40%	102.60%	32.90%