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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Debt Instrument [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0.1 4.2 0.9 11.5
Total Southern European Accounts Receivable $ 939.9   $ 939.9  
Total Southern European Accounts Receivable Greater Than 120 Days Past Due 429.3   429.3  
Total Southern European Accounts Receivable Greater Than 365 Days Past Due $ 179.9   $ 179.9  
Convertible Senior Notes Due In May 2013 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Convertible, Conversion Price (usd per share) $ 19.05   $ 19.05  
Class of Warrant or Right, Exercise Price of Warrants or Rights (usd per share) 26.95   26.95  
Convertible Senior Notes Due In May 2014 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Convertible, Conversion Price (usd per share) $ 22.54   $ 22.54  
Class of Warrant or Right, Exercise Price of Warrants or Rights (usd per share) 28.38   28.38  
Convertible Senior Notes Due In May 2016 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Convertible, Conversion Price (usd per share) $ 22.71   $ 22.71  
Class of Warrant or Right, Exercise Price of Warrants or Rights (usd per share) 30.05   30.05