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Stock-Based Compensation Stock-Based Compensation (Restricted Stock Awards) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 3 Months Ended
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2013
Restricted Stock Units
Dec. 31, 2012
Restricted Stock Units
Dec. 31, 2013
Restricted Stock Awards
Sep. 30, 2013
Restricted Stock Awards
Dec. 31, 2013
Number of Shares Underlying Restricted Units — Contingent Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value         $ 21.54 $ 24.06  
Outstanding at September 30, 2013         1,000,000   5,587,181
Number of Shares Underlying Restricted Stock, Granted         250,000   1,404,938
Number of Shares Underlying Restricted Stock, Vested         250,000   745,689
Outstanding at December 31, 2013         1,000,000   4,956,940
Weighted average remaining recognition period of outstanding Restricted Units         1 year 7 months   2 years 0 months
Unearned stock-based compensation expense of outstanding Restricted Units         $ 19.7   $ 75.1
Aggregate intrinsic value of outstanding Restricted Units         15.2   75.3
Weighted Average Grant Date Fair Value, Granted $ 15.71 $ 22.32 $ 14.59 $ 22.25 $ 15.71    
Weighted Average Grant Date Fair Value, Vested         $ 25.80    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period         0   (1,289,490)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Intrinsic Value $ 3.9 $ 5.3 $ 59.0 $ 100.9      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value         $ 0.00