Investments (Tables)

12 Months Ended

Dec. 31, 2020

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 (in millions):

	December 31,
	2020				2019
	Assets		Funding commitments		Assets
Chem-Mod LLC	$	4.0	$	-	$	4.0
Chem-Mod International LLC		2.0		-		2.0
Clean-coal investments:
Controlling interest in limited liability companies
that own fourteen 2009 Era Clean Coal Plants		-		-		-
Non-controlling interest in a limited liability
company that owns one 2011 Era Clean Coal Plant		0.1		-		0.3
Controlling interest in limited liability companies
that own twenty 2011 Era Clean Coal Plants		12.4		0.9		29.2
Other investments		3.9				4.5
Total investments	$	22.4	$	0.9	$	40.0