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Accounts Receivable Securitization (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Accounts Receivable Securitization    
Trade accounts receivable balance sold $ 45.9 $ 64.2
Fair value of deferred purchase price notes $ 37.3 $ 54.1
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 $ 75.0  
Average collection cycle for accounts receivable (in days) (less than) 60 days