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Leases (Tables) | 12 Months Ended
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Dec. 31, 2024
Leases |
Schedule of lease cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended December 31,
​ | 2024 |  | 2023 |  | 2022
​ | (in millions)
Operating lease cost | $ | 75.1 | ​ | $ | 68.8 | ​ | $ | 68.2
Variable fees and other(1) | ​ | 30.9 | ​ | ​ | 28.6 | ​ | ​ | 23.2
Total lease cost | $ | 106.0 | ​ | $ | 97.4 | ​ | $ | 91.4
(1) | Includes variable lease payments and costs of short-term leases.
Schedule of supplemental cash flow and other lease information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ | Year Ended December 31,
​ | 2024 |  | 2023 |  | 2022
​ | (in millions)
Supplemental cash flow information: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash payments for operating leases | $ | 74.8 | ​ | $ | 95.2 | ​ | $ | 86.9
Right-of-use assets obtained in exchange for operating lease obligations | $ | 87.7 | ​ | $ | 74.7 | ​ | $ | 52.4
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | December 31, | ​ | December 31,
​ | ​ | ​ | ​ | 2024 | ​ | 2023
Other lease information: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average remaining lease term—operating leases | ​ | ​ | ​ | ​ | 6.3 years | ​ | ​ | 5.8 years
Weighted average discount rate—operating leases | ​ | ​ | ​ | ​ | 4.6% | ​ | ​ | 4.3%
Schedule of maturities of operating lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | (in millions)
2025 | ​ | ​ | ​ | ​ | ​ | ​ | $ | 72.5
2026 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 60.1
2027 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 48.7
2028 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 39.8
2029 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 32.3
Thereafter | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 67.9
Total operating lease payments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 321.3
Less: imputed interest | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (45.7)
Total operating lease liabilities | ​ | ​ | ​ | ​ | ​ | ​ | $ | 275.6
​

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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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