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Earnings Per Share (Narrative) (Details) - shares
shares in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares)   0.0
Contingently issuable share excluded 0.1 0.2
Performance Shares [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 0.0