Debt - Narrative (Details) - Line of Credit [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 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
Line Of Credit Maturity Date	Jun. 14, 2018
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 leverage ratio calculation, which cannot exceed 3.50 to 1.
Line of Credit Facility, Covenant Compliance	As of March 31, 2017 and December 31, 2016, the Company’s consolidated leverage 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	$ 47.9	$ 47.9