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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Summary of Balances of Right of Use Assets and Liabilities of Finance Leases and Operating Leases | The balances of right-of-use assets and liabilities of finance leases and operating leases, and their locations on our Consolidated Balance Sheets are as follows:
|  |  |  | Year Ended December 31, |
|  | Balance Sheet Location |  | 2020 |  |  | 2019 |
Right-of-use assets |  |  |  |  |  |  |  |  |  |
Operating leases, gross |  | Other long-term assets |  | $ | 52.7 |  |  | $ | 42.0 |
Finance leases, gross |  | Property, plant and equipment |  |  | 51.8 |  |  |  | 48.8 |
Lease liabilities |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |
Operating leases |  | Accrued liabilities |  | $ | 12.0 |  |  | $ | 7.8 |
Finance leases |  | Current debt obligations |  |  | 12.1 |  |  |  | 12.2 |
Non-current: |  |  |  |  |  |  |  |  |  |
Operating leases |  | Other long-term liabilities |  | $ | 46.2 |  |  | $ | 47.2 |
Finance leases |  | Long-term debt |  |  | 18.7 |  |  |  | 25.8 |
Summary of Components of Lease Expense | Operating lease costs and short-term lease costs are included in Operating expenses or General and administrative expense in our Consolidated Statements of Operations, depending on the nature of the leases. Finance lease costs are included in Depreciation and amortization expense and Interest income (expense) in our Consolidated Statements of Operations. The components of lease expense were as follows:
|  |  |  | Year Ended December 31, |
|  |  |  | 2020 |  |  | 2019 |
Lease cost |  |  |  |  |  |  |  |  |  |
Operating lease cost |  |  |  | $ | 11.6 |  |  | $ | 9.9 |
Short-term lease cost |  |  |  |  | 20.7 |  |  |  | 30.0 |
Variable lease cost |  |  |  |  | 5.5 |  |  |  | 6.7 |
Finance lease cost |  |  |  |  |  |  |  |  |  |
Amortization of right-of-use assets |  |  |  |  | 13.6 |  |  |  | 13.1 |
Interest expense |  |  |  |  | 1.4 |  |  |  | 1.6 |
Total lease cost |  |  |  | $ | 52.8 |  |  | $ | 61.3 |
Summary of Other Supplemental Information Related to Leases | During the year ended December 31, 2018, total operating leases expense incurred was $56.0 million, which includes short-term leases for compressors and equipment. Other supplemental information related to our leases are as follows:
|  |  |  | Year Ended December 31, |
|  |  |  | 2020 |  |  | 2019 |
Cash paid for amounts included in the measurement of lease liabilities |  |  |  |  |  |  |  |  |  |
Operating cash flows for operating leases |  |  |  | $ | 12.3 |  |  | $ | 8.7 |
Operating cash flows for finance leases |  |  |  |  | 1.4 |  |  |  | 1.6 |
Financing cash flows for finance leases |  |  |  |  | 12.4 |  |  |  | 11.5 |
Summary of Maturities of Lease Liabilities Under Non-cancellable Leases | The following table presents the maturities of our lease liabilities under non-cancellable leases as of December 31, 2020:
|  | Operating Leases |  |  | Finance Leases |
Future Minimum Lease Payments Beginning After December 31, |  |  |  |  |  |  |  |
2020 |  | $ | 14.1 |  |  | $ | 13.0 |
2021 |  |  | 13.3 |  |  |  | 11.6 |
2022 |  |  | 11.5 |  |  |  | 6.0 |
2023 |  |  | 7.1 |  |  |  | 1.5 |
2024 |  |  | 4.2 |  |  |  | 0.3 |
Thereafter |  |  | 15.5 |  |  |  | — |
Total undiscounted cash flows |  |  | 65.7 |  |  |  | 32.4 |
Less imputed interest |  |  | (7.5 | ) |  |  | (1.6 | )
Total lease liabilities |  | $ | 58.2 |  |  | $ | 30.8 |

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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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