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LEASES (Tables) | 12 Months Ended
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Dec. 31, 2023
LEASES. |
Schedule of supplemental balance sheet information related to leases | The following table presents the supplemental balance sheet information related to leases as of December 31, 2023 and 2022 (in millions):
​ | ​ | ​ | ​ | ​ | ​
​ | December 31, | ​ | December 31,
​ | 2023 | ​ | 2022
Operating lease right of use assets | $ | 136.6 | ​ | $ | 111.7
Total leased assets | $ | 136.6 | ​ | $ | 111.7
​ | ​ | ​ | ​ |  | ​
Current operating lease liabilities (1) | $ | 20.8 | ​ | $ | 18.3
Non-current operating lease liabilities | ​ | 150.8 | ​ | ​ | 129.3
Total leased liabilities | $ | 171.6 | ​ | $ | 147.6
(1) | These amounts are reflected within accounts payable and accrued liabilities in the consolidated balance sheets.
Schedule of lease cost and other information | The following table presents operating lease costs and other information as of and for the years ended December 31, 2023 and 2022 (in millions, except as stated):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​ | ​ | Year Ended December 31, | ​
​ | ​ | 2023 | ​ | ​ | 2022 | ​
Operating lease costs (1) | ​ | $ | 34.5 | ​ | ​ | $ | 30.0 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Lease term and discount rate information: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average remaining lease term (years) | ​ | ​ | 8.6 | ​ | ​ | ​ | 10.2 | ​
Weighted average discount rate | ​ | ​ | 3.4 | % | ​ | ​ | 3.1 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Supplemental cash flow information and non-cash activity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash paid for amounts included in the measurement of lease liabilities | ​ | $ | 24.9 | ​ | ​ | $ | 20.9 | ​
Right-of-use assets obtained in exchange for lease liabilities | ​ | ​ | 44.5 | ​ | ​ | ​ | 24.4 | ​
(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 December 31, 2023 (in millions):
​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023
2024 | ​ | $ | 26.6
2025 | ​ | ​ | 26.8
2026 | ​ | ​ | 27.9
2027 | ​ | ​ | 23.5
2028 | ​ | ​ | 21.3
After 2028 (1) | ​ |  | 75.8
Total lease payments | ​ | $ | 201.9
Less: Interest | ​ | ​ | (30.3)
Present value of lease liabilities | ​ | $ | 171.6
(1) | Total lease payments include $13.8 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 -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + 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 -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-6 + Details
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