Stock-Based Compensation (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (costs of sales and general and administrative)	$ 2,200,000	$ 4,100,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	(2,200,000.0)	0.0
Impact on cash flow due to taxes paid related to net share settlement of equity awards	$ 5,700,000	$ 4,700,000