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Receivables (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 17.6  
Additions - charged to expense 6.8 $ 9.8
Transfer from (to) allowance for credit losses (see below) 1.1 (7.8)
Net recoveries and write-offs 3.0 1.7
Ending Balance 28.5 13.9
Net long-term customer receivables 129.3  
Allowance for long term customer receivables [Roll Forward]    
Beginning balance 49.1  
Additions - charged to expense 3.4 12.1
Transfer from (to) allowance for doubtful accounts (see above) (1.1) 7.8
Net recoveries and write-offs (2.2) 0.0
Ending balance $ 49.2 $ 29.2