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Common Equity | 9 Months Ended
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Sep. 30, 2018
Common Equity [Text Block] | Common Equity Automatic Dividend Reinvestment and Stock Purchase Plan The Company issued no shares of common stock under its Automatic Dividend Reinvestment and Stock Purchase Plan during the three and nine months ended September 30, 2018. Earnings Per Share Basic earnings per share is calculated by dividing net income attributable to the Company by the weighted-average number of the Company's common shares outstanding during the period. In the calculation of diluted earnings per share, weighted-average shares outstanding are increased for additional shares that would be outstanding if potentially dilutive securities were converted to common stock. Potentially dilutive securities for the Company consist of performance units and restricted stock units. The following table calculates basic and diluted earnings per share for the Company.
| Three Months Ended September 30, | Nine Months Ended September 30,
(In millions except per share data) | 2018 | 2017 | 2018 | 2017
Net income | $ | 205.1 |  | $ | 183.4 |  | $ | 370.8 |  | $ | 324.2 |
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) | 0.9 |  | 0.4 |  | 0.7 |  | 0.3 |
Diluted average common shares outstanding | 200.6 |  | 200.1 |  | 200.4 |  | 200.0 |
Basic earnings per average common share | $ | 1.03 |  | $ | 0.92 |  | $ | 1.86 |  | $ | 1.62 |
Diluted earnings per average common share | $ | 1.02 |  | $ | 0.92 |  | $ | 1.85 |  | $ | 1.62 |
Anti-dilutive shares excluded from earnings per share calculation | — |  | — |  | — |  | — |

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- Definition Disclosures related to earnings per share and current quarter activities in the automatic dividend reinvestment and stock purchase plan. + References No definition available. + Details
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