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Share-based compensation (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Weighted-average grant-date fair value per share    
Tax benefits realized for the tax deductions $ 0.7 $ 0.6
Restricted shares
   
Restricted stock awards and restricted stock units    
Outstanding, beginning of period (in shares) 9,005 46,807
Vested (in shares)   (8,700)
Outstanding, end of period (in shares) 9,005 38,107
Weighted-average grant-date fair value per share    
Outstanding, beginning of period (in dollars per share) $ 22.21 $ 24.45
Vested (in dollars per share)   $ 27.17
Outstanding, end of period (in dollars per share) $ 22.21 $ 23.83
Unrecognized compensation cost 0.2  
Weighted-average period over which unrecognized compensation cost expected to be recognized 1 year 8 months 12 days  
Fair value of vested stock (in dollars)   0.2
Tax benefits realized for the tax deductions   0.1
Restricted stock units
   
Restricted stock awards and restricted stock units    
Outstanding, beginning of period (in shares) 315,094 247,286
Granted (in shares) 107,231 92,512
Vested (in shares) (113,212) (21,247)
Forfeited (in shares) (7,968)  
Outstanding, end of period (in shares) 301,145 318,551
Weighted-average grant-date fair value per share    
Outstanding, beginning of period (in dollars per share) $ 22.82 $ 21.80
Granted (in dollars per share) $ 26.89 $ 25.98
Vested (in dollars per share) $ 20.30 $ 24.95
Forfeited (in dollars per share) $ 25.26  
Outstanding, end of period (in dollars per share) $ 25.15 $ 22.80
Total weighted-average grant-date fair value 2.9 2.4
Unrecognized compensation cost 5.4  
Weighted-average period over which unrecognized compensation cost expected to be recognized 3 years  
Fair value of vested stock (in dollars) 3.5 0.6
Tax benefits realized for the tax deductions $ 1.1 $ 0.2