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Basis of Presentation and Accounting Policies (Tables)
12 Months Ended
Sep. 30, 2011
Basis of Presentation and Accounting Policies [Abstract] 
Reconciled Basic and Diluted EPS
                         
    2011     2010     2009  
Income from continuing operations
  $ 697.1     $ 440.4     $ 217.9  
Less: Allocation to participating securities
    (1.4 )     (1.0 )     (0.5 )
 
                 
Income from continuing operations available to common shareowners
  $ 695.7     $ 439.4     $ 217.4  
 
                 
Income from discontinued operations
  $ 0.7     $ 23.9     $ 2.8  
Less: Allocation to participating securities
    —       (0.1 )     —  
 
                 
Income from discontinued operations available to common shareowners
  $ 0.7     $ 23.8     $ 2.8  
 
                 
Net income
  $ 697.8     $ 464.3     $ 220.7  
Less: Allocation to participating securities
    (1.4 )     (1.1 )     (0.5 )
 
                 
Net income available to common shareowners
  $ 696.4     $ 463.2     $ 220.2  
 
                 
Basic weighted average outstanding shares
    142.7       142.0       141.6  
Effect of dilutive securities
                       
Stock options
    2.1       1.7       0.7  
Performance shares
    0.4       0.3       0.1  
 
                 
Diluted weighted average outstanding shares
    145.2       144.0       142.4  
 
                 
 
                       
Basic earnings per share:
                       
Continuing operations
  $ 4.88     $ 3.09     $ 1.54  
Discontinued operations
    —       0.17       0.02  
 
                 
Net income
  $ 4.88     $ 3.26     $ 1.56  
 
                 
 
                       
Diluted earnings per share:
                       
Continuing operations
  $ 4.79     $ 3.05     $ 1.53  
Discontinued operations
    0.01       0.17       0.02  
 
                 
Net income
  $ 4.80     $ 3.22     $ 1.55