Stockholders' Equity - Narrative (Details) - $ / shares	Feb. 29, 2016	Mar. 31, 2016	Dec. 31, 2015
Common Class A
Class of Stock [Line Items]
Common stock, shares outstanding		113,127,989	114,630,318
Common stock dividends declared (in dollars per share)	$ 0.275
Common stock dividends declared, annualized (in dollars per share)	$ 1.10
Treasury Stock
Class of Stock [Line Items]
Common stock, shares outstanding			5,244
Treasury Stock | Common Class A
Class of Stock [Line Items]
Common stock, shares outstanding		5,244