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Leases | 6 Months Ended
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Jun. 30, 2021
Leases [Abstract] |
Leases | Leases The Company has operating leases for corporate offices, research and development facilities and manufacturing facilities. We determine if an arrangement is a lease at inception. Operating leases are included in right-of-use ("ROU") assets and liabilities. The components of lease expense were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Operating lease cost: |  |  |  |  |  |  |
Amortization of right-of-use assets | $ | 1.5 |  |  | $ | 1.0 |  |  | $ | 2.8 |  |  | $ | 2.1 |
Interest on lease liabilities | 0.3 |  |  | 0.3 |  |  | 0.7 |  |  | 0.6 |
Total operating lease cost | $ | 1.8 |  |  | $ | 1.3 |  |  | $ | 3.5 |  |  | $ | 2.7 |
Operating lease costs are reflected as components of cost of product sales and contract development and manufacturing services, research and development expense and selling, general and administrative expense. Supplemental balance sheet information related to leases was as follows:
(In millions, except lease term and discount rate) | Balance Sheet location |  | June 30, 2021 |  | December 31, 2020
Operating lease right-of-use assets | Other assets |  | $ | 29.6 |  | $ | 31.0
Operating lease liabilities, current portion | Other current liabilities |  | 5.7 |  | 5.4
Operating lease liabilities | Other liabilities |  | 25.9 |  | 27.8
Total operating lease liabilities |  |  | $ | 31.6 |  | $ | 33.2
Operating leases: |  |  |  |  |
Weighted average remaining lease term (years) |  |  | 7.2 |  | 7.7
Weighted average discount rate |  |  | 4.0 | % |  | 4.1 | %

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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 + Details
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