Earnings Per Share - CMS Energy
9 Months Ended
Sep. 30, 2011
Earnings Per Share - CMS Energy [Abstract] 
Earnings Per Share - CMS Energy
6: EARNINGS PER SHARE — CMS ENERGY
Presented in the following table are CMS Energy's basic and diluted EPS computations based on income from continuing operations:
                                 
    In Millions, Except Per Share Amounts  
    Three Months Ended     Nine Months Ended  
September 30   2011     2010     2011     2010  
Income Available to Common Stockholders
                                
Income from continuing operations
   $ 140     $ 146     $ 374     $ 335  
Less income attributable to noncontrolling interests
     1       1       2       3  
Less charge for deferred issuance costs on preferred stock
     —       8       —       8  
Less preferred stock dividends
     —       3       —       8  
 
Income from Continuing Operations Available to Common Stockholders — Basic and Diluted
   $ 139     $ 134     $ 372     $ 316  
 
Average Common Shares Outstanding
                                
Weighted average shares — basic
     251.3       229.0       250.5       228.4  
Add dilutive contingently convertible securities
     11.3       24.9       11.4       21.3  
Add dilutive non-vested stock awards and options
     0.6       0.2       0.4       0.1  
Add dilutive convertible debentures
     0.7       0.6       —       —  
 
Weighted average shares — diluted
     263.9       254.7       262.3       249.8  
 
Income from Continuing Operations per Average Common Share Available to Common Stockholders
                                
Basic
   $ 0.55     $ 0.58     $ 1.48     $ 1.38  
Diluted
     0.53       0.53       1.42       1.26  
 
Contingently Convertible Securities
When CMS Energy has earnings from continuing operations, its contingently convertible securities dilute EPS to the extent that the conversion value of a security, which is based on the average market price of CMS Energy common stock, exceeds the principal value of that security.
Stock Options and Warrants
For the three months and nine months ended September 30, 2011, outstanding options to purchase 0.1 million shares of CMS Energy common stock had no impact on diluted EPS, since the exercise price was greater than the average market price of CMS Energy common stock. These stock options have the potential to dilute EPS in the future.
Non-vested Stock Awards
CMS Energy's non-vested stock awards are composed of participating and non-participating securities. The participating securities accrue cash dividends when common stockholders receive dividends. Since the recipient is not required to return the dividends to CMS Energy if the recipient forfeits the award, the non-vested stock awards are considered participating securities. As such, the participating non-vested stock awards were included in the computation of basic EPS. The non-participating securities accrue stock dividends that vest concurrently with the stock award. If the recipient forfeits the award, the stock dividends accrued on the non-participating securities are also forfeited. Accordingly, the non-participating awards and stock dividends were included in the computation of diluted EPS, but not basic EPS.
Convertible Debentures
For the nine months ended September 30, 2011 and the nine months ended September 30, 2010, CMS Energy's 7.75 percent convertible subordinated debentures would have increased diluted earnings per share had they been included in the calculation. Using the if-converted method, the debentures would have had the following impacts on the calculation of diluted EPS:
                 
In Millions
    Nine Months Ended
September 30   2011     2010  
 
Increase to numerator from assumed reduction in interest expense
   $ 1     $ 1  
Increase to denominator from assumed conversion of debentures into common shares
     0.7       0.7  
 
CMS Energy can revoke the conversion rights if certain conditions are met.