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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Summary of Allowance for Doubtful Accounts and Revenue Adjustments [Table Text Block]
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, 2013
    $ 6.6      $ 14.0      $ (12.5 )    $ 8.1  
December 31, 2014
     8.1       19.0       (17.6 )     9.5  
December 31, 2015
     9.5       9.5       (9.1 )     9.9