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Receivables (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 17.6  
Additions - charged to expense 5.6 $ 9.8
Transfer from (to) allowance for credit losses (see below) (4.0) (7.8)
Net recoveries, write-offs and other 2.3 1.7
Ending Balance 21.5 13.9
Net long-term customer receivables 99.1  
Allowance for long term customer receivables [Roll Forward]    
Beginning balance 49.1  
Additions - charged to expense 9.8 12.1
Transfer from (to) allowance for doubtful accounts (see above) 4.0 7.8
Net recoveries, write-offs and other (1.6) 0.0
Ending balance $ 61.3 $ 29.2