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Investments (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity Method Investments And Joint Ventures [Abstract] |
Investments Reported in Other 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, |
|  | 2021 |  |  | 2020 |
|  | Assets |  |  | Funding commitments |  |  | Assets |
Chem-Mod LLC |  | $ | — |  |  | $ | — |  |  | $ | 4.0 |
Chem-Mod International LLC |  |  | — |  |  |  | — |  |  |  | 2.0 |
Clean-coal investments: |  |  |  |  |  |  |  |  |  |  |  |
Non controlling interest in a limited liability |  |  |  |  |  |  |  |  |  |  |  |
company that owns one 2011 Era Clean Coal Plant |  |  | — |  |  |  | — |  |  |  | 0.1 |
Controlling interest in limited liability companies |  |  |  |  |  |  |  |  |  |  |  |
that own twenty 2011 Era Clean Coal Plants |  |  | — |  |  |  | — |  |  |  | 12.4 |
Other investments |  |  | 5.5 |  |  |  | 0.5 |  |  |  | 3.9 |
Total investments |  | $ | 5.5 |  |  | $ | 0.5 |  |  | $ | 22.4 |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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