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, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Share-Based Compensation.        
Share-based compensation costs $ 3.4 $ 1.5 $ 5.1 $ 6.0
Less income tax benefit 1.3 0.6 1.9 2.2
Share-based compensation costs, net of tax $ 2.1 $ 0.9 $ 3.2 $ 3.8
Stock based compensation        
Increase in number of shares issuable under stock compensation plans 3,900,000      
Time-Based stock awards
       
Stock based compensation        
Granted (in shares)     59,294  
Weighted average fair value of equity instruments other than options (in dollars per share)     $ 29.26  
Performance-based stock awards (maximum that can be earned)
       
Stock based compensation        
Granted (in shares)     574,600  
Weighted average fair value of equity instruments other than options (in dollars per share)     $ 28.55  
Shares granted included in performance-based stock awards whose payout level is based upon the Company's total shareholder return     185,327  
Performance measurement period used to determined shares granted included in performance-based stock awards     3 years  
Stock options
       
Stock based compensation        
Granted (in shares)     449,828  
Weighted average exercise price (in dollars per share)     $ 28.16  
Weighted average fair value of options granted (in dollars per share)     $ 6.97