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Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2019
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,
 
  
2019
 
  
2018
 
Premium finance advances and loans
  $
388.1
    $
316.2
 
Accrued supplemental, direct bill and other receivables
   
369.1
     
348.2
 
Refined coal production related receivables
   
103.4
     
160.2
 
Deferred contract costs
   
98.3
     
91.6
 
Prepaid expenses
   
115.5
     
108.2
 
                 
Total other current assets
  $
1,074.4
     $
1,024.4