Stockholders' Equity (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) shares
Stockholders' Equity Attributable to Parent [Abstract]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	3,200,000
Treasury Stock Purchase Plan	$ 40.0
Treasury Stock Purchase Plan Remaining Available	$ 7.2
Shares Paid for Tax Withholding for Share Based Compensation | shares	27,129
Payments Related to Tax Withholding for Share-based Compensation	$ 4.0