Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2013
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Income Taxes (Textuals)          
Unrecognized tax benefits $ 32.1        
Unrecognized tax benefits, interest on income taxes accrued 5.5        
Unrecognized tax benefits, income tax penalties accrued 1.4        
Unrecognized tax benefits expense 3.9        
Unrecognized tax benefits, interest on income taxes expense 1.0        
Unrecognized tax benefits, income tax penalties expense 0.2        
Unrecognized tax benefits of limitations for tax 3.4        
Unrecognized tax benefits reductions resulting from interest 1.1        
Unrecognized tax benefits reductions resulting from penalty 0.1        
Year to date increase in tax due to expiry of statue 0.5        
Year to date increase in penalties due to expiry of statue 0.1        
Year to date decrease in related tax interest due to expiry of statue 0.1        
Unrecognized tax benefits excluding interest and penalties that if recognized would affect effective tax rate 32.1        
Unrecognized tax benefits, interest on income taxes that would impact effective tax rate 5.5        
Unrecognized tax benefits, income tax penalties that would impact effective tax rate $ 1.4        
Maximum percentage of tax during holiday period 12.00% 25.00% 11.00% 0.00% 0.00%