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Accounts Receivable Securitization (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Accounts Receivable Securitization    
Trade accounts receivable balance sold $ 149.2 $ 149.2
Fair value of deferred purchase price notes 72.2 34.3
Period for which the entity will be able to comply with the financial covenants pertaining to the Receivable Purchase Agreement (in months) 12 months  
Maximum
    
Accounts Receivable Securitization    
Capacity of securitization program $ 150.0  
Average collection cycle for accounts receivable (in days) 60 days