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Per Share Information - Narrative (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Weighted average shares outstanding attributable to participating securities (in shares) 3.0 2.6 2.9 2.6