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Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2017
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,  
     2017      2016  

Premium finance advances and loans

   $ 305.5      $ 241.2  

Accrued supplemental, direct bill and other receivables

     154.6        177.2  

Refined coal production related receivables

     156.8        136.9  

Prepaid expenses

     91.5        78.4  
  

 

 

    

 

 

 

Total other current assets

   $ 708.4      $ 633.7