Stock-Based Compensation (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (costs of sales and general and administrative)	$ 2,100,000	$ 2,000,000	$ 6,900,000	$ 8,000,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	(300,000.0)	200,000.0	(3,100,000.0)	500,000.0
Impact on cash flow due to taxes paid related to net share settlement of equity awards	$ 1,500,000	$ 500,000	$ 9,300,000	$ 5,300,000