Investments (Tables)

12 Months Ended

Dec. 31, 2014

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, 2014				December 31,
			Funding		2013
	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		—		—		2.0
Clean-coal investments:
Controlling interest in five limited liability companies that own fourteen 2009 Era Clean Coal Plants		17.3		—		18.3
Non-controlling interest in one limited liability companies that owns one 2011 Era Clean Coal Plants		1.0		—		1.1
Controlling interest in thirteen limited liability companies that own nineteen 2011 Era Clean Coal Plants		54.5		—		59.3
Other investments		3.2		2.9		3.7
Total investments	$	82.0	$	2.9	$	90.4