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Other Financial Data (Tables)
 3 Months Ended
Mar. 31, 2019
Other Financial Data Disclosure [Abstract]  
Schedule of other current assets
Major classes of other current assets consist of the following (in millions):
 
 
 
March 31,
 
 
December 31,
 
 
 
2019
 
 
2018
 
Premium finance advances and loans
 
$
305.1
 
 
$
316.2
 
Accrued supplemental, direct bill and other receivables
 
 
306.3
 
 
 
348.2
 
Refined coal production related receivables
 
 
114.0
 
 
 
160.2
 
Deferred contract costs
 
 
55.1
 
 
 
91.6
 
Prepaid expenses
 
 
95.0
 
 
 
108.2
 
Total other current assets
 
$
875.5
 
 
$
1,024.4