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Share-based compensation (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based compensation      
Income tax benefit (in dollars) $ 2.8 $ 2.4 $ 1.5
Common stock
     
Share-based compensation      
Shares granted 33,184 29,448 34,908
Fair value of vested stock (in dollars) 0.8 0.8 0.8
Income tax benefit (in dollars) $ 0.3 $ 0.3 $ 0.3