Quarterly report pursuant to Section 13 or 15(d)

Stock Repurchase Programs (Details)

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Stock Repurchase Programs (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 6 Months Ended
Nov. 30, 2011
Mar. 31, 2013
Mar. 31, 2012
Stock Repurchase Programs      
Stock repurchase programs, authorized amount $ 125.0    
Common shares repurchased   249,549 236,700
Common shares repurchased, cost   14.6 8.8
Amount remaining available for future stock repurchases   $ 114.6