Earnings Per Share - Additional Information (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Earnings per share reconciliation disclosure			Earnings per share (“EPS”) are calculated by dividing net income attributable to common stockholders by the weighted-average number of shares of Common Stock outstanding during the period. Diluted EPS are calculated similarly but includes potential dilution from the exercise of stock options and stock awards, except when the effect would be anti-dilutive.
Stock options and stock awards outstanding, excluded from computation of earnings per share amount	2.0	1.0	2.0	1.0