Debt - Narrative (Details) - Line of Credit [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Line of Credit Facility Current Borrowing Capacity	$ 300.0
Line of Credit Facility Maximum Borrowing Capacity	$ 400.0
Debt Instrument Maturity Date Description	During the second quarter of 2017, the Credit Facility was amended and restated to extend the maturity date from June 2018 to June 2019.
Line of Credit Facility, Covenant Terms	Access to the Credit Facility is dependent on meeting certain financial and other covenants, but primarily depends on the Company’s consolidated net debt to adjusted EBITDA ratio, which cannot exceed 3.50 to 1.
Line of Credit Facility, Covenant Compliance	As of June 30, 2017 and December 31, 2016, the Company’s consolidated net debt to adjusted EBITDA ratio was below 1.0 to 1, and the Company was also in compliance with all of its other covenants.
Line of Credit Facility, Amount Outstanding	$ 56.1	$ 47.9