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Receivables (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 13.9 $ 37.2
Additions — charged to expense 4.8 5.9
Transfers from allowance for doubtful accounts   (29.2)
Net Recoveries and write- offs (1.2)  
Ending Balance 17.5 13.9
Accounts Receivable, Net, Noncurrent 116.6  
Allowance for long term customer receivables [Roll Forward]    
Beginning balance 29.2 0.0
Additions - charged to expense 2.0 29.2
Net Recoveries and write- offs 0.0 0.0
Ending balance $ 31.2 $ 29.2