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Receivables (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 13.9 $ 37.2
Additions — charged to expense 4.5 5.9
Transfer to long-term allowance (7.8) (29.2)
Net Recoveries and write-offs 1.0  
Ending Balance 11.6 13.9
Accounts Receivable, Net, Noncurrent 109.5  
Allowance for long term customer receivables [Roll Forward]    
Beginning balance 29.2 0.0
Additions - charged to expense 10.6  
Additions - charged to expense 7.8 29.2
Net Recoveries and write- offs 0.0 0.0
Ending balance $ 47.6 $ 29.2