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, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Share-Based Compensation        
Share-based compensation $ 1.5 $ 1.6 $ 6.0 $ 6.9
Less income tax benefit 0.6 0.5 2.2 2.5
Share-based compensation costs, net-of-tax $ 0.9 $ 1.1 $ 3.8 $ 4.4
Stock options
       
Stock based compensation        
Weighted average exercise price (in dollars per share)     $ 20.68  
Granted (in shares)     497,818  
Weighted average fair value of options granted (in dollars per share)     $ 4.89  
Time-Based stock awards
       
Stock based compensation        
Granted (in shares)     80,762  
Weighted average fair value of equity instruments other than options (in dollars per share)     $ 22.68  
Performance-based stock awards (maximum that can be earned)
       
Stock based compensation        
Granted (in shares)     765,564  
Weighted average fair value of equity instruments other than options (in dollars per share)     $ 20.68