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 12 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2011
2008 and 2010 Plan
Dec. 31, 2010
2008 and 2010 Plan
Sep. 30, 2010
2008 and 2010 Plan
Nov. 30, 2011
2011 Plan
Stock Repurchase Programs          
Stock repurchase programs, authorized amount       $ 175.0 $ 125.0
Common shares repurchased   236,700 272,306    
Common shares repurchased, cost   8.8 8.4    
Amount remaining available for future stock repurchases $ 127.9