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Investments
3 Months Ended
Mar. 31, 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):
 
 
 
March 31, 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
 
 
3.8
 
 
 
5.1
 
Non-controlling interest in one limited liability company that owns one 2011 Era Clean Coal Plant
 
 
0.4
 
 
 
0.4
 
Controlling interest in seventeen limited liability companies that own nineteen 2011 Era Clean Coal Plants
 
 
39.8
 
 
 
43.0
 
Other investments
 
 
4.9
 
 
 
5.0
 
Total investments
 
$
54.9
 
 
$
59.5