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Accounts Receivable Securitization (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Accounts Receivable Securitization    
Trade accounts receivable balance sold $ 133.9 $ 148.9
Fair value of deferred purchase price notes 60.3 41.3
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