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Consolidated Statements Of Changes In Common Stock Equity (USD $)
In Millions
Total
Common Equity
Retained Earnings
Beginning Balance at Dec. 31, 2009 $ 193.1 $ 159.5 $ 33.6
Net Income 9.6   9.6
Dividends (15.0)   (15.0)
Shares Issued Under Stock Plans 0.4 0.4  
Issuance of Common Shares 0.9 0.9  
Ending Balance at Dec. 31, 2010 189.0 160.8 28.2
Net Income 16.4   16.4
Dividends (15.2)   (15.2)
Shares Issued Under Stock Plans 0.5 0.5  
Issuance of Common Shares 1.0 1.0  
Ending Balance at Dec. 31, 2011 191.7 162.3 29.4
Net Income 18.2   18.2
Dividends (17.2)   (17.2)
Shares Issued Under Stock Plans 0.9 0.9  
Issuance of Common Shares 1.1 1.1  
Issuance of Common Shares 65.7 65.7  
Ending Balance at Dec. 31, 2012 $ 260.4 $ 230.0 $ 30.4