Equity - Common Stock Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Sep. 08, 2015
Class of Stock [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.26	$ 0.16	$ 0.14
Common Class C, Non-Voting [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount					$ 25.0
Repurchase of Class C Common Stock				668,000
Stock Repurchased and Retired During Period, Value	$ 19.6			$ 19.6