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Share Based Compensation (Details 2) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Summary of activity        
Payout percentage 180.00% 173.00% 200.00% 42.00%
Performance shares [Member]
       
Summary of activity        
Outstanding shares, beginning balance   297    
Granted, shares   79    
Adjustment for performance results achieved   98    
Vested and issued, shares   (232) (345) (44)
Forfeited, shares   (9)    
Outstanding shares, ending balance   233 297  
Outstanding, Wtd. Avg. Grant Date Share Fair Value, Beginning Balance   $ 76.84    
Granted, Wtd. Avg. Grant Date Share Fair Value   $ 98.15 $ 101.57 $ 87.00
Adjustment for performance results achieved, Wtd. Avg.Grant Date Fair Value   $ 54.81    
Vested and issued, Wtd. Avg. Grant Date Share Fair Value   $ 54.81    
Forfeited, Wtd. Avg. Grant Date Share Fair Value   $ 96.82    
Outstanding, Wtd. Avg. Grant Date Share Fair Value, Ending Balance   $ 96.02 $ 76.84  
Vested shares, Total Fair Value   $ 18.7 $ 25.8 $ 3.0
Restricted stock and restricted stock units [Member]
       
Summary of activity        
Outstanding shares, beginning balance   269    
Granted, shares   65    
Vested and issued, shares   (124)    
Forfeited, shares   (11)    
Outstanding shares, ending balance   199 269  
Outstanding, Wtd. Avg. Grant Date Share Fair Value, Beginning Balance   $ 59.57    
Granted, Wtd. Avg. Grant Date Share Fair Value   $ 80.17 $ 73.73 $ 69.00
Vested and issued, Wtd. Avg. Grant Date Share Fair Value   $ 44.71    
Forfeited, Wtd. Avg. Grant Date Share Fair Value   $ 76.13    
Outstanding, Wtd. Avg. Grant Date Share Fair Value, Ending Balance   $ 74.63 $ 59.57  
Vested shares, Total Fair Value   $ 9.4 $ 6.2 $ 4.5