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Earnings Per Share (Narrative) (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Basic weighted average number of common shares outstanding for all classes of common shares (in shares) 49.1 47.6
Antidilutive securities excluded from computation of diluted net earnings per share 1.0 3.2