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Share-based compensation plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2013
Grant Date Closing [Member]
Jun. 30, 2013
Beginning Average [Member]
Jun. 30, 2012
Minimum [Member]
Jun. 30, 2012
Maximum [Member]
Jun. 30, 2013
2013 Equity Incentive Plan
Sep. 30, 2013
Performance Shares [Member]
Jun. 30, 2013
Performance Shares [Member]
Jun. 30, 2013
Market Share Units [Member]
Sep. 30, 2013
Restricted Stock Units RSU [Member]
Jun. 30, 2013
Restricted Stock Units RSU [Member]
Jun. 30, 2013
2005 Equity Incentive Plan
Sep. 30, 2013
Non-Employee Directors' Equity Plan
Jun. 30, 2013
Non-Employee Directors' Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of shares underlying options 207,000                            
Weighted-average exercise price per share $ 22.39                            
Share Price     $ 26.44 $ 27.59                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                              
Expected dividend yield - weighted average 1.80%                            
Expected volatility - weighted average 40.00%           39.00%                
Risk-free interest rate - weighted average 0.70%                            
Risk-free interest rate range - minimum 0.50%                            
Risk-free interest rate range - maximum 0.90%                            
Expected term in years 4 years 3 months 0 days       3 years 3 months 0 days 5 years 3 months 0 days                  
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Aggregate Weighted Average Grant Date Fair Value $ 1.3                            
Weighted-average fair value estimates at grant date $ 6.29                            
Nonvested share activity [Rollforward]                              
Beginning balance - shares   430,900         0           407,900 23,000 23,000
Stock units granted - shares   468,200         468,200 1,403 207,095 96,175 12,502 164,977 0 19,201 0
Cancelled awards - shares   (42,800)         (6,800)           (36,000)   0
Vested - shares   (22,700)         0           (22,700)   0
Ending balance - shares   833,600         461,400           349,200   23,000
Weighted-average grant-date fair value [Rollforward]                              
Beginning Balance - grant-date fair value   $ 23.19                          
Stock units granted - grant-date fair value   $ 26.01             $ 26.21 $ 26.42   $ 25.54      
Cancelled awards - grant-date fair value   $ 23.75                          
Vested - grant-date fair value   $ 23.15                          
Ending Balance - grant-date fair value   $ 24.75