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Investments
6 Months Ended
Jun. 30, 2019
Equity Method Investments and Joint Ventures [Abstract]  
Investments
12.
Investments
The following is a summary of our investments, included in other noncurrent assets in the consolidated balance sheet (in millions):
 
June 30, 2019
   
December 31, 2018
 
Chem-Mod
LLC
  $
4.0
    $
4.0
 
Chem-Mod
International LLC
   
2.0
     
2.0
 
Clean-coal investments:
   
     
 
Controlling interest in six limited liability companies that own fourteen 2009 Era Clean Coal Plants
   
2.5
     
5.1
 
Non-controlling
interest in one limited liability company that owns one 2011 Era Clean Coal Plant
   
0.3
     
0.4
 
Controlling interest in seventeen limited liability companies that own nineteen 2011 Era Clean Coal Plants
   
36.0
     
43.0
 
Other investments
   
4.4
     
5.0
 
                 
Total investments
  $
49.2
    $
59.5