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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator        
Net Income (Loss) Available to Common Shareholders - Basic $ 49.4 $ (186.7) $ 377.6 $ (143.4)
Dilutive effect of Equity Units 0.6 0.0 1.0 0.0
Net Income (Loss) Available to Common Shareholders - Diluted $ 50.0 $ (186.7) $ 378.6 $ (143.4)
Denominator        
Basic Average Common Shares Outstanding 393.2 383.8 392.9 383.5
Dilutive potential common shares        
Equity Units 35.2 0.0 21.3 0.0
Shares contingently issuable under employee stock plans 0.9 0.0 0.7 0.0
Shares restricted under stock plans 0.3 0.0 0.3 0.0
Forward Agreements 0.7 0.0 0.6 0.0
Diluted Average Common Shares 430.3 383.8 415.8 383.5