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
3 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Nov. 30, 2011
2011 Plan
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