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Investment Income (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Schedule of Investment Income
3.
  
INVESTMENT INCOME
  
   
  
   
  
   
 
  
Dividends received
  
 
—  
 
  
 
0.4
 
  
 
—  
 
 
  
Interest received - environmental trust funds
  
 
0.7
 
  
 
0.6
 
  
 
0.5
 
 
  
Interest received - cash balances
  
 
6.6
 
  
 
6.8
 
  
 
5.1
 
 
  
Total investment income
  
 
7.3
 
  
 
7.8
 
  
 
5.6