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Supplemental Financial Statement Information - (Tables) | 9 Months Ended
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Sep. 30, 2021
Other Income and Expenses [Abstract] |
Schedule of Other Expense, Net | Other income (expense), net for the three and nine months ended September 30, 2021 and 2020 was as follows:
(in millions) | Three months ended September 30, | Nine months ended September 30,
| 2021 |  | 2020 | 2021 |  | 2020
Rent and royalty income | $ | 0.2 |  |  | $ | 0.1 |  | $ | 0.7 |  |  | $ | 0.6 |
Gains from disposal of property, plant and equipment, net | 0.1 |  |  | 0.8 |  | 2.5 |  |  | 3.3 |
Net equity income (loss) on joint ventures (See Note 6) | 0.4 |  |  | (1.0) |  | 0.4 |  |  | (6.6) |
Joint venture restructuring charges (See Note 6) | — |  |  | — |  | — |  |  | (2.4) |
Gain from sale of business (See Note 5) | 13.7 |  |  | — |  | 13.7 |  |  | — |
Adjustment to indemnification for conditional ARO costs | — |  |  | — |  | — |  |  | 4.3 |
Other | 0.1 |  |  | (0.3) |  | 0.1 |  |  | — |
Total other income (expense), net | $ | 14.5 |  |  | $ | (0.4) |  | $ | 17.4 |  |  | $ | (0.8) |
Roll Forward of Restructuring Reserve Activity | Restructuring reserves for severance cost activity is as follows:
| Severance and Employee
| Benefit Costs
Balance at December 31, 2020 | $ | 43.4 |
Adjustments | (9.2) |
Payments | (12.4) |
Balance at September 30, 2021 | $ | 21.8 |

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- Definition The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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