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Share-based payments (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Employee [Member]
Ratably Over Four Years [Member]
Dec. 31, 2012
Restricted Stock [Member]
Management [Member]
Third Anniversary of Grant [Member]
Dec. 31, 2012
Restricted Stock [Member]
Management [Member]
Date of 2015 Earnings Release [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated Share-based Compensation Expense $ 6.3 $ 10.5        
Tax Benefit from Compensation Expense $ 2.3 $ 3.9        
Restricted Stock Grants in Period       188,300 94,100 205,600
Restrcited stock vesting period     4 years      
Share Price $ 81.45          
Performance share fair value - percentage premium to closing stock price     7.00%