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Receivables (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 17.6  
Additions - charged to expense 1.8 $ 9.8
Transfer (to) from allowance for credit losses (see below) (3.1) (7.8)
Net recoveries and write-offs 2.3 1.7
Ending Balance 24.8 13.9
Net long-term customer receivables 143.4  
Allowance for long term customer receivables [Roll Forward]    
Beginning balance 49.1  
Additions - charged to expense 1.8 12.1
Transfer (to) from allowance for doubtful accounts (see above) (3.1) (7.8)
Net Recoveries and write-offs 0.1 0.0
Ending balance $ 47.9 $ 29.2