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Common Equity (Tables) | 3 Months Ended
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Mar. 31, 2020
Equity [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table calculates basic and diluted earnings (loss) per share for the Company.
|  |  | Three Months Ended March 31, |
(In millions except per share data) |  |  | 2020 | 2019
Net income (loss) |  |  | $ | (491.8) |  | $ | 47.1 |
Average common shares outstanding: |  |  |  |
Basic average common shares outstanding |  |  | 200.2 |  | 199.9 |
Effect of dilutive securities: |  |  |  |
Contingently issuable shares (performance and restricted stock units) |  |  | — |  | 0.6 |
Diluted average common shares outstanding |  |  | 200.2 |  | 200.5 |
Basic earnings (loss) per average common share |  |  | $ | (2.46) |  | $ | 0.24 |
Diluted earnings (loss) per average common share |  |  | $ | (2.46) |  | $ | 0.24 |
Anti-dilutive shares excluded from earnings per share calculation |  |  | — |  | — |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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