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Other Financial Data (Tables)
 9 Months Ended
Sep. 30, 2019
Other Financial Data Disclosure [Abstract]  
Schedule of other current assets
Major classes of other current assets consist of the following (in millions):
                 
 
September 30,
2019
 
  
December 31,
2018
 
Premium finance advances and loans
  $
362.3
    $
316.2
 
Accrued supplemental, direct bill and other receivables
   
383.0
     
348.2
 
Refined coal production related receivables
   
131.8
     
160.2
 
Deferred contract costs
   
64.3
     
91.6
 
Prepaid expenses
   
95.2
     
108.2
 
                 
Total other current assets
  $
  1,036.6
    $
  1,024.4