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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Net Income (Loss) Available to Common Shareholders - Basic $ 529.8 $ (72.7) $ 328.0
Dilutive effect of Equity Units 1.6 0.0 0.0
Net Income (Loss) Available to Common Shareholders - Diluted $ 531.4 $ (72.7) $ 328.0
Average common shares outstanding - Basic 393,600 384,300 374,600
Equity Units 22,000 0 0
Shares contingently issuable under employee stock plans 800 0 900
Shares restricted under employee stock plans 300 0 200
ATM Forward agreements 600 0 300
Average Common Shares - Diluted 417,300 384,300 376,000
Basic Earnings (Loss) Per Share $ 1.35 $ (0.19) $ 0.88
Diluted Earnings (Loss) Per Share $ 1.27 $ (0.19) $ 0.87