Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation (Details)

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Share-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Share-Based Compensation        
Share-based compensation costs $ 1.6 $ 3.7 $ 6.9 $ 6.1
Less income tax benefit 0.5 1.4 2.5 2.3
Share-based compensation costs, net-of-tax $ 1.1 $ 2.3 $ 4.4 $ 3.8
Stock options
       
Restricted stock units (RSUs) and Performance-based stock units (PBUs)        
Granted (in shares)     546,642  
Weighted average exercise price (in dollars per share) $ 22.37   $ 22.37  
Weighted average grant date fair value (in dollars per share)     $ 5.88  
Time-Based stock awards
       
Restricted stock units (RSUs) and Performance-based stock units (PBUs)        
Granted (in shares)     64,044  
Weighted average grant date fair value (in dollars per share)     $ 23.05  
Performance-based stock awards (maximum that can be earned)
       
Restricted stock units (RSUs) and Performance-based stock units (PBUs)        
Granted (in shares)     700,560  
Weighted average grant date fair value (in dollars per share)     $ 22.34