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Common Equity (Tables) | 3 Months Ended
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Mar. 31, 2016
Equity [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | Basic and diluted earnings per share for the Company were calculated as follows:
| Three Months Ended March 31,
(In millions) | 2016 | 2015
Net Income | $ | 25.2 |  | $ | 43.2 |
Average Common Shares Outstanding |  |
Basic average common shares outstanding | 199.7 |  | 199.5 |
Effect of dilutive securities: |  |
Contingently issuable shares (performance and restricted stock units) | — |  | — |
Diluted average common shares outstanding | 199.7 |  | 199.5 |
Basic Earnings Per Average Common Share | $ | 0.13 |  | $ | 0.22 |
Diluted Earnings Per Average Common Share | $ | 0.13 |  | $ | 0.22 |
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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