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Leases | 12 Months Ended
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Dec. 31, 2019
Leases |
Leases | Note 10. Leases ​ Our metals service center leases are comprised of processing and distribution facilities, equipment, trucks and trailers, ground leases and other leased spaces, such as depots, sales offices, storage and data centers. We also lease various office buildings, including our corporate headquarters in Los Angeles, California. Our leases of facilities and other spaces expire at various times through 2031 and our ground leases expire at various times through 2068. Nearly all of our leases are operating leases. Information regarding the insignificant amount of finance leases we have is not meaningful to an understanding of our lease obligations. ​ The following is a summary of our lease cost: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended December 31,
​ | 2019 |  | 2018 |  | 2017
​ | (in millions)
Operating lease cost | $ | 84.4 | ​ | $ | 82.7 | ​ | $ | 77.9
​ Our operating lease costs include payments to various related parties that are not executive officers of the Company, in the amounts of $2.5 million, $4.1 million and $3.4 million in 2019, 2018 and 2017, respectively. These related party leases are for buildings leased to certain of the companies we have acquired and expire in various years through 2023. ​ Supplemental cash flow and balance sheet information is presented below: ​
​ | ​ | ​
​ | Year Ended
​ | December 31, 2019
​ | (in millions)
Supplemental cash flow information | ​ | ​
Cash payments for operating leases | $ | 84.6
Right-of-use assets obtained in exchange for operating lease obligations | ​ | 71.1
​ | ​ | ​
​ | December 31,
​ | 2019
Other lease information | ​ | ​
Weighted average remaining lease term—operating leases | ​ | 5.6 years
Weighted average discount rate—operating leases | ​ | 4.3%
​ ​ Maturities of operating lease liabilities as of December 31, 2019 are as follows: ​
​ | ​ | ​
​ | (in millions)
2020 | $ | 59.6
2021 | ​ | 47.8
2022 | ​ | 35.9
2023 | ​ | 27.5
2024 | ​ | 20.7
Thereafter | ​ | 39.6
Total operating lease payments | ​ | 231.1
Less: imputed interest | ​ | (29.1)
Total operating lease liabilities | $ | 202.0
​ ​ As previously presented in our consolidated financial statements for the year ended December 31, 2018, included in our Annual Report on Form 10-K, future minimum payments under previous lease accounting guidance for non-cancelable operating leases were as follows: ​
​ | ​ | ​
​ | (in millions)
2019 | $ | 59.5
2020 | ​ | 45.5
2021 | ​ | 32.9
2022 | ​ | 22.7
2023 | ​ | 16.2
Thereafter | ​ | 40.7
Total operating lease payments | $ | 217.5
​

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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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