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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator        
Net Income (Loss) Available to Common Shareholders - Basic $ 46.5 $ (18.5) $ 328.2 $ 43.3
Dilutive effect of Series A Equity Units 0.4 0.0 0.4 0.0
Net Income (Loss) Available to Common Shareholders - Diluted $ 46.9 $ (18.5) $ 328.6 $ 43.3
Denominator        
Basic Average Common Shares Outstanding 393.0 383.5 392.8 383.3
Dilutive potential common shares        
Series A Equity Units 28.2 0.0 14.2 0.0
Shares contingently issuable under employee stock plans 0.8 0.0 0.7 0.7
Shares restricted under stock plans 0.3 0.0 0.3 0.2
Forward Agreements 0.6 0.0 0.5 0.0
Diluted Average Common Shares 422.9 383.5 408.5 384.2