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Common Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table calculates basic and diluted earnings per share for the Company.
| Three Months Ended June 30, | Six Months Ended June 30,
(In millions except per share data) | 2018 | 2017 | 2018 | 2017
Net income | $ | 110.7 |  | $ | 104.8 |  | $ | 165.7 |  | $ | 140.8 |
Average common shares outstanding: |  |  |  |
Basic average common shares outstanding | 199.7 |  | 199.7 |  | 199.7 |  | 199.7 |
Effect of dilutive securities: |  |  |  |
Contingently issuable shares (performance and restricted stock units) | 0.8 |  | 0.2 |  | 0.6 |  | 0.3 |
Diluted average common shares outstanding | 200.5 |  | 199.9 |  | 200.3 |  | 200.0 |
Basic earnings per average common share | $ | 0.55 |  | $ | 0.52 |  | $ | 0.83 |  | $ | 0.70 |
Diluted earnings per average common share | $ | 0.55 |  | $ | 0.52 |  | $ | 0.83 |  | $ | 0.70 |
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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