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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Lease Expense and Weighted Average Remaining Lease Term and Weighted Average Discount Rate | The components of lease expense were as follows:
| Year ended December 31, 2020 |  | Year ended December 31, 2019
| (Dollars in millions)
Operating leases: |  |  |
Cost of products sold and operating expenses | $ | 1.8 |  |  | $ | 1.9 |
Selling, general and administrative expenses | 0.5 |  |  | 0.5 |
| $ | 2.3 |  |  | $ | 2.4 |
Short-term leases: |  |  |
Cost of products sold and operating expenses(1)(2) | 6.4 |  |  | 9.3 |
Total lease expense | $ | 8.7 |  |  | $ | 11.7 |
(1)Includes expenses for month-to-month equipment leases, which are classified as short-term as the Company is not reasonably certain to renew the lease term beyond one month. (2)Includes variable lease expenses, which are immaterial to the consolidated financial statements. The weighted average remaining lease term and weighted average discount rate were as follows:
| December 31, 2020 |  | December 31, 2019
Weighted average remaining lease term of operating leases | 7.3 years |  | 7.9 years
Weighted average discount rate of operating leases | 4.7 | % |  | 4.8 | %
Supplemental Balance Sheet and Cash Flow Information | Supplemental balance sheet information related to leases was as follows:
| Financial Statement Classification |  | December 31, 2020 |  | December 31, 2019
|  |  | (Dollars in millions) |  |
Operating ROU assets | Deferred charges and other assets |  | $ | 10.8 |  |  | $ | 12.4 |
Operating lease liabilities: |  |  |  |  |
Current operating lease liabilities | Accrued liabilities |  | $ | 2.0 |  |  | $ | 1.9 |
Noncurrent operating lease liabilities | Other deferred credits and liabilities |  | 8.2 |  |  | 9.8 |
Total operating lease liabilities |  |  | $ | 10.2 |  |  | $ | 11.7 |
Supplemental cash flow information related to leases was as follows:
| Year Ended December 31, 2020 |  | Year Ended December 31, 2019
| (Dollars in millions) |  |
Operating cash flow information: |  |  |
Cash paid for amounts included in the measurement of operating lease liabilities | $ | 2.3 |  |  | $ | 3.9 |
Non-cash activity: |  |  |
ROU assets obtained in exchange for new operating lease liabilities | $ | 0.2 |  |  | $ | 7.9 |
Lease Maturity, Operating Lease | Maturities of operating lease liabilities as of December 31, 2020 are as follows:
| (Dollars in millions)
Year ending December 31: |
2021 | $ | 2.3 |
2022 | 1.7 |
2023 | 1.4 |
2024 | 1.3 |
2025 | 1.3 |
2026-Thereafter | 4.0 |
Total lease payments | 12.0 |
Less: imputed interest | 1.8 |
Total lease liabilities | $ | 10.2 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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