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Earnings Per Share - CMS Energy (Tables) | 3 Months Ended
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Mar. 31, 2012
Earnings Per Share - CMS Energy [Abstract] |
Basic and Diluted EPS Computation |
|  | In Millions, Except Per Share Amounts |
Three Months Ended March 31 |  | 2012 |  |  | 2011 |
Income Available to Common Stockholders |  |  |  |  |  |  |  |
Income from Continuing Operations Available to Common Stockholders – Basic and Diluted |  | $ | 60 |  |  | $ | 133 |
Average Common Shares Outstanding |  |  |  |  |  |  |  |
Weighted average shares – basic |  |  | 255.6 |  |  |  | 250.0 |
Add dilutive contingently convertible securities |  |  | 10.4 |  |  |  | 10.7 |
Add dilutive non-vested stock awards and options |  |  | 0.8 |  |  |  | 0.3 |
Add dilutive convertible debentures |  |  | — |  |  |  | 0.7 |
Weighted average shares – diluted |  |  | 266.8 |  |  |  | 261.7 |
Income from Continuing Operations per Average Common Share Available to Common Stockholders |  |  |  |  |  |  |  |
Basic |  | $ | 0.23 |  |  | $ | 0.53 |
Diluted |  |  | 0.22 |  |  |  | 0.51 |
Schedule of Potential Impacts on the Calculation of Diluted EPS using the If-Converted Method |
|  | In Millions |
Three Months Ended March 31 |  | 2012 |
Increase to numerator from assumed reduction in interest expense |  | $ | 1 |
Increase to denominator from assumed conversion of debentures into common shares |  |  | 0.5 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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