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Per Share Information - Narrative (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Weighted average shares outstanding attributable to participating securities (in shares) 2.8 2.6 2.9 2.5