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Earnings (Loss) Per Share (Details 2) - shares
shares in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Anti-dilutive shares excluded from calculation of earnings per share    
Anti-dilutive shares excluded from calculation of earnings per share 3.6  
Options    
Anti-dilutive shares excluded from calculation of earnings per share    
Anti-dilutive shares excluded from calculation of earnings per share 1.8 2.0