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Common Equity (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | basic and diluted earnings per share for the Company.
| Three Months Ended March 31,
(In millions except per share data) | 2018 | 2017
Net income | $ | 55.0 |  | $ | 36.0 |
Average common shares outstanding: |  |
Basic average common shares outstanding | 199.7 |  | 199.7 |
Effect of dilutive securities: |  |
Contingently issuable shares (performance and restricted stock units) | 0.5 |  | 0.3 |
Diluted average common shares outstanding | 200.2 |  | 200.0 |
Basic earnings per average common share | $ | 0.28 |  | $ | 0.18 |
Diluted earnings per average common share | $ | 0.27 |  | $ | 0.18 |
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://www.xbrl.org/2003/role/presentationRef -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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