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Leases Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Components of Lease Expense | The components of lease expense during the years ended December 31, 2020 and 2019 are as follows (in millions):
|  | 2020 |  | 2019
Long-term operating lease cost |  | $ | 23.3 |  |  | $ | 29.5 |
Short-term operating lease cost |  | 19.2 |  |  | 12.2 |
Sublease income |  | (2.3) |  |  | (2.4) |
Total operating lease cost |  | $ | 40.2 |  |  | $ | 39.3 |
Supplemental Balance Sheet Information | Supplemental balance sheet information related to our operating leases is as follows (in millions, except lease term and discount rate) as of December 31, 2020 and 2019:
| 2020 |  | 2019
Operating lease right-of-use assets | $ | 35.8 |  |  | $ | 58.1 |
Current lease liability | $ | 15.7 |  |  | $ | 21.1 |
Long-term lease liability | 21.6 |  |  | 51.8 |
Total operating lease liabilities | $ | 37.3 |  |  | $ | 72.9 |
Weighted-average remaining lease term (in years) | 4.3 |  | 5.1
Weighted-average discount rate (1) | 8.24 | % |  | 8.23 | %
(1)Represents our estimated incremental borrowing cost on a secured basis for similar terms as the underlying leases.
Maturities of Lease Liabilities | Maturities of lease liabilities as of December 31, 2020 were as follows (in millions):
2021 | $ | 17.8 |
2022 | 12.0 |
2023 | 3.0 |
2024 | 2.2 |
2025 | 2.0 |
Thereafter | 9.0 |
Total lease payments | $ | 46.0 |
Less imputed interest | 8.7 |
Total | $ | 37.3 |

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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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- Definition Assets and Liabilities, Lessee [Table Text Block] + References No definition available. + Details
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