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9. LEASES

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We primarily lease manufacturing and research facilities, administrative offices, land, tanks, railcars and equipment. Leases with an initial term of 12 months or less are not recognized on the balance sheets; we recognize lease expense for these leases on a straight-line basis over the lease term. Our variable lease cost was approximatelyÌýnil for each of the years ended December 31, 2020Ìýand 2019, respectively. Our leases have remaining lives from one month to 37Ìýyears. Certain lease agreements include one or more options to renew, at our discretion, with renewal terms that can extend the lease term by approximately one year to 30 years or more. Renewal and termination options that we are reasonably certain to exercise have been included in the calculation of the lease right-of-use assets and lease liabilities. None of our lease agreements contain material residual value guarantees or material restrictions or covenants.

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The components of operating lease expense, cash flows and supplemental noncash information from continuing operations are as follows (dollars in millions):

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The weighted-average lease term and discount rate for our operating leases from continuing operations are as follows:

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The undiscounted future cash flows of operating lease liabilities from continuing operations as of December 31, 2020 are as follows (dollars in millions):

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As of December 31, 2020, we have additional leases, primarily for leases of office and manufacturing facilities and rail cars, that have not yet commenced of approximately $9Ìýmillion. These leases will commenceÌýin 2021Ìýwith lease terms of up to seven years.

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During November 2020, we entered into a sale and leaseback agreement to sell certain properties in Basel, Switzerland for approximately CHF 67Ìýmillion (approximately $73Ìýmillion) and to lease those properties back for five years. This transactionÌýresulted in a gain of approximately CHF 30Ìýmillion (approximately $33Ìýmillion).Ìý

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