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Schedule II - Valuation and Qualifying Accounts (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred Tax Valuation Allowance
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 223.9 $ 172.7 $ 89.4
Additions      
Charged to Cost and Expenses 635.8 49.1 85.0
Charged to Other Accounts 0 2.1 9.3
Acquisition 0 0 0
Deductions 1.3 0 11.0
Balance at End of Year 858.4 223.9 172.7
Accounts Receivable Allowance
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 0    
Additions      
Charged to Cost and Expenses 8.1    
Charged to Other Accounts 0    
Acquisition 0    
Deductions 0    
Balance at End of Year $ 8.1