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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

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