Investments (Tables)

9 Months Ended

Sep. 30, 2017

Equity Method Investments and Joint Ventures [Abstract]

Investments Reported in Other Current and Non-Current Assets

The following is a summary of our investments, included in other noncurrent assets in the consolidated balance sheet, and the related funding commitments (in millions):

	September 30, 2017				December 31,
			Funding		2016
	Assets		Commitments		Assets
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		11.5		—		14.3
Non-controlling interest in one limited liability company that owns one 2011 Era Clean Coal Plant		0.6		—		0.7
Controlling interest in seventeen limited liability companies that own nineteen 2011 Era Clean Coal Plants		62.2		—		69.0
Other investments		3.7		0.4		3.7
Total investments	$	84.0	$	0.4	$	93.7