Debt - Narrative (Details) - Line of Credit [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
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 this 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	At June 30, 2016 and December 31, 2015, 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	$ 65.3		$ 62.9