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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Schedule II – Valuation and Qualifying Accounts (in millions)
 
Allowance for Doubtful
Accounts and Revenue
Adjustments for the Years Ended:
  
Balance at
Beginning of
Year
    
Charged to
Expense/
Against
Revenue
    
Write-Offs,
Net of
Recoveries
    
Balance at
End of Year
  
                                 
December 31, 2014
   $
8.1
     $
19.0
    $
(17.6
 )   $
9.5
  
December 31, 2015
    
9.5
      
9.5
      
(9.1
 )    
9.9
  
December 31, 2016
    
9.9
      
19.5
      
(16.0
 )    
13.4