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Retirement Plans and Other Post-Retirement Benefits (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Retirement plans and other post retirement benefits (Textual) [Abstract]      
Pension settlement charge   $ 2.0  
Accumulated benefit obligation for all defined benefit pension plans 507.4 451.7  
Manager's benchmarked performance minimum 40.00%    
Treasury bills days 90 days    
Defined contribution plans Employees contribution 50.00%    
Expense associated with Defined Contribution Plans 1.7 1.3 1.0
Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rates 4.28% 5.09%  
Prior service cost as a component of net periodic benefit cost from accumulated other comprehensive income (loss) 3.1    
Actuarial net (gain) loss as a component of net periodic benefit cost from accumulated other comprehensive income (loss) (17.0) (13.3)  
Retirement plans and other post retirement benefits (Textual) [Abstract]      
Pension settlement charge   2.0  
Pension Benefits [Member] | Minimum [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rates 3.50%    
Pension Benefits [Member] | Maximum [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rates 4.51%    
Other Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rates 3.58% 4.45%  
Prior service cost as a component of net periodic benefit cost from accumulated other comprehensive income (loss) 0.5    
Actuarial net (gain) loss as a component of net periodic benefit cost from accumulated other comprehensive income (loss) $ (0.7) $ (0.9)  
Other Benefits [Member] | Minimum [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rates 3.02%    
Other Benefits [Member] | Maximum [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rates 3.69%