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LEASES (Tables) | 6 Months Ended
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Jun. 30, 2021
LEASES |
Schedule of supplemental balance sheet | The following table presents the supplemental balance sheet information related to leases as of June 30, 2021 and December 31, 2020, respectively (in millions): ​
​ | ​ | ​ | ​ | ​ | ​
​ | June 30, | ​ | December 31,
​ | 2021 | ​ | 2020
Operating lease right of use assets | $ | 113.7 | ​ | $ | 111.0
Total leased assets | $ | 113.7 | ​ | $ | 111.0
​ |  | ​ | ​ |  | ​
Accrued liabilities | $ | 13.5 | ​ | $ | 12.5
Non-current operating lease liabilities | ​ | 134.0 | ​ | ​ | 132.1
Total leased liabilities | $ | 147.5 | ​ | $ | 144.6
Schedule of lease cost and other information | ​ The following table presents operating lease costs and other information as of and for the three and six months ended June 30, 2021 and 2020, respectively (in millions, except as stated):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020
Operating lease costs (1) | $ | 6.3 | ​ | ​ | $ | 5.0 | ​ | ​ | $ | 12.5 | ​ | ​ | $ | 9.8 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Lease term and discount rate information: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average remaining lease term (years) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 11.5 | ​ | ​ | ​ | 12.8 | ​
Weighted average discount rate | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 3.3 | % | ​ | ​ | 3.4 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Supplemental cash flow information and non-cash activity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash paid for amounts included in the measurement of lease liabilities | $ | 8.6 | ​ | ​ | $ | 2.6 | ​ | ​ | $ | 12.7 | ​ | ​ | $ | 5.4 | ​
Lease incentive for leasehold improvements | ​ | — | ​ | ​ | ​ | 4.8 | ​ | ​ | ​ | — | ​ | ​ | ​ | 25.2 | ​
Right-of-use assets obtained in exchange for lease liabilities | ​ | 9.7 | ​ | ​ | ​ | 6.7 | ​ | ​ | ​ | 10.7 | ​ | ​ | ​ | 70.9 | ​
(1) | Includes short-term lease and variable lease costs, which are immaterial.
Schedule of maturities of lease liabilities | The maturities of the lease liabilities are as follows as of June 30, 2021 (in millions):
​ | ​ | ​ | ​
​ | ​ | June 30,
​ |  | 2021
Remainder of 2021 | ​ | $ | 8.0
2022 | ​ | ​ | 17.9
2023 | ​ | ​ | 18.1
2024 | ​ | ​ | 13.1
2025 | ​ | ​ | 12.8
After 2025 | ​ |  | 110.4
Total lease payments (1) | ​ | $ | 180.3
Less: Interest | ​ | ​ | (32.8)
Present value of lease liabilities | ​ | $ | 147.5
(1) | Total lease payments include $20.4 million related to options to extend lease terms that are reasonably certain of being exercised.

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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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