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Earnings (Loss) Per Share (Details 2) - shares
shares in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Anti-dilutive shares excluded from calculation of earnings per share      
Anti-dilutive shares excluded from calculation of earnings per share 2.4 3.7  
Options      
Anti-dilutive shares excluded from calculation of earnings per share      
Anti-dilutive shares excluded from calculation of earnings per share 1.6 1.5 2.2