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Earnings (Loss) Per Share (Details 2) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Anti-dilutive shares excluded from calculation of earnings per share        
Anti-dilutive shares excluded from calculation of earnings per share 3.4   3.7  
Options        
Anti-dilutive shares excluded from calculation of earnings per share        
Anti-dilutive shares excluded from calculation of earnings per share 1.3 2.0 1.4 2.0