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Leases (Tables) | 6 Months Ended
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Jun. 30, 2021
Leases |
Schedule of lease cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended | ​ | Six Months Ended
​ | June 30, | ​ | June 30,
​ | 2021 |  | 2020 |  | 2021 |  | 2020
​ | (in millions) | ​ | (in millions)
Operating lease cost | $ | 19.3 | ​ | $ | 20.4 | ​ | $ | 39.0 | ​ | $ | 41.5
Schedule of supplemental cash flow and other lease information | ​
​ | ​ | ​ | ​ | ​ | ​
​ | Six Months Ended
​ | June 30,
​ | 2021 |  | 2020
​ | (in millions)
Supplemental cash flow information: | ​ | ​ | ​ | ​ | ​
Cash payments for operating leases | $ | 39.1 | ​ | $ | 41.3
Right-of-use assets obtained in exchange for operating lease obligations | $ | 33.0 | ​ | $ | 27.5
​ | ​ | ​ | ​ | ​ | ​
​ | June 30, | ​ | December 31,
​ | 2021 | ​ | 2020
Other lease information: | ​ | ​ | ​ | ​ | ​
Weighted average remaining lease term—operating leases | ​ | 6.2 years | ​ | ​ | 5.7 years
Weighted average discount rate—operating leases | ​ | 3.6% | ​ | ​ | 3.7%
Schedule of maturities of operating lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | (in millions)
2021 (remaining six months) | ​ | ​ | ​ | $ | 29.4
2022 | ​ | ​ | ​ | ​ | 51.6
2023 | ​ | ​ | ​ | ​ | 41.9
2024 | ​ | ​ | ​ | ​ | 33.7
2025 | ​ | ​ | ​ | ​ | 23.9
Thereafter | ​ | ​ | ​ | ​ | 60.5
Total operating lease payments | ​ | ​ | ​ | ​ | 241.0
Less: imputed interest | ​ | ​ | ​ | ​ | (30.3)
Total operating lease liabilities | ​ | ​ | ​ | $ | 210.7

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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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