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Earnings Per Share (Average Common shares Outstanding Basic and Diluted) (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Basic 337.3 340.7 343.6
Dilutive effect of stock options and restricted share unit awards 1.5 1.8 2.0
Diluted 338.8 342.5 345.6