Income Taxes - Reconciliation of the income tax provisions based on the U.S. statutory corporate tax rate to the provisions reflected in the Consolidated Financial Statements (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of the income tax provisions based on the statutory corporate tax rate to the provisions reflected in the Consolidated Financial Statements
Statutory tax rate	20.25%	21.50%	23.00%
U.S. state income taxes, net of U.S. federal benefit	0.50%	1.50%	2.60%
Taxes on international operations	(6.60%)	(8.90%)	(4.40%)
Nondeductible expenses	2.20%	1.70%	1.40%
Adjustments to prior year tax requirements	(1.30%)	0.90%	0.10%
Deferred tax adjustments, including statutory rate changes	(0.10%)	(0.70%)	1.40%
Deferred tax adjustments, international earnings	0.00%	1.00%	3.30%
Adjustments to valuation allowances	(0.60%)	0.60%	(1.70%)
Change in uncertain tax positions	1.40%	1.70%	(0.30%)
Other — net	0.00%	(0.40%)	0.00%
Effective tax rate	15.80%	18.90%	25.40%