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Investments (Tables)
12 Months Ended
Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]  
Investments Reported in Other Current and Non-Current Assets

The following is a summary of our investments and the related funding commitments (in millions):

 

     December 31, 2016      December 31,  
            Funding      2015  
     Assets      Commitments      Assets  

Chem-Mod LLC

   $ 4.0       $ —         $ 4.0   

Chem-Mod International LLC

     2.0         —           2.0   

C-Quest Technology LLC and C-Quest Technologies International LLC

     —           —           —     

Clean-coal investments:

        

Controlling interest in six limited liability companies that own fourteen 2009 Era Clean Coal Plants

     14.3         —           13.9   

Non-controlling interest in one limited liability companies that owns one 2011 Era Clean Coal Plants

     0.7         —           0.8   

Controlling interest in seventeen limited liability companies that own nineteen 2011 Era Clean Coal Plants

     69.0         2.7         60.3   

Other investments

     3.7         0.7         2.6   
  

 

 

    

 

 

    

 

 

 

Total investments

   $ 93.7       $ 3.4       $ 83.6