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Investments - Investments Reported in Other Current and Non-Current Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]    
Funding Commitments $ 11.4  
Assets 90.4 54.1
Chem-Mod LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Funding Commitments     
Assets 4.0 4.0
Chem-Mod International LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Funding Commitments     
Assets 2.0 2.0
C-Quest Technology LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Funding Commitments     
Assets 2.0   
Clean-Coal Investments [Member] | Non-controlling Interest [Member] | Seven 2009 Era Clean Coal Plants [Member]
   
Schedule of Equity Method Investments [Line Items]    
Funding Commitments 0.6  
Assets 4.5 2.8
Clean-Coal Investments [Member] | Non-controlling Interest [Member] | Five 2011 Era Clean Coal Plants [Member]
   
Schedule of Equity Method Investments [Line Items]    
Funding Commitments     
Assets 12.1 13.2
Clean-Coal Investments [Member] | Controlling Interest [Member] | Seven 2009 Era Clean Coal Plants [Member]
   
Schedule of Equity Method Investments [Line Items]    
Funding Commitments 2.7  
Assets 13.8 6.3
Clean-Coal Investments [Member] | Controlling Interest [Member] | Eleven 2011 Era Clean Coal Plants [Member]
   
Schedule of Equity Method Investments [Line Items]    
Funding Commitments 2.7  
Assets 46.0 9.2
Clean-Coal Investments [Member] | Controlling Interest [Member] | Four 2011 Era Clean Coal Plants [Member]
   
Schedule of Equity Method Investments [Line Items]    
Funding Commitments     
Assets 2.3 5.1
Clean-Coal Investments [Member] | Notes Receivable and Interest from Co-Investor [Member] | Three 2009 Era Plants [Member]
   
Schedule of Equity Method Investments [Line Items]    
Funding Commitments     
Assets    8.5
Other Investments [Member]
   
Schedule of Equity Method Investments [Line Items]    
Funding Commitments 5.4  
Assets $ 3.7 $ 3.0