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Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Summary of Major Classes of Other Current Assets

Major classes of other current assets consist of the following (in millions):

 

     December 31,  
     2016      2015  

Premium finance advances and loans

   $ 241.2       $ 220.2   

Accrued supplemental, direct bill and other receivables

     177.2         181.1   

Refined coal production related receivables

     136.9         108.1   

Prepaid expenses

     78.4         77.8   
  

 

 

    

 

 

 

Total other current assets

   $ 633.7       $ 587.2