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Earnings Per Share (Narrative) (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Stock Options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount 0.8 0.3
Contingently Issuable Shares [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount 0.9 0.7