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Earnings Per Share (Narrative) (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Series A Preferred Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Percentage of common stock if-converted Series A preferred stock (percent)     16.80%  
Series A preferred shares, number of shares issuable if converted (shares) 13.8   13.8  
Stock Options and Restricted Stock Units [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities not included in the calculation of diluted income per share 0.1 2.2 0.2 0.8