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LEASES (Tables) | 9 Months Ended
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Sep. 30, 2021
LEASES |
Summary of lease cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(In millions) |  | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020
Operating lease cost | ​ | $ | 26.7 | ​ | $ | 20.0 | ​ | $ | 79.4 | ​ | $ | 60.5
Short-term lease cost | ​ |  | 0.1 | ​ |  | 4.4 | ​ |  | 2.9 | ​ |  | 6.9
Variable lease cost | ​ |  | 0.1 | ​ |  | 0.2 | ​ |  | 0.5 | ​ |  | 0.6
Total lease cost | ​ | $ | 26.9 | ​ | $ | 24.6 | ​ | $ | 82.8 | ​ | $ | 68.0

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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=123408670&loc=SL77918686-209980 + Details
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- References No definition available. + Details
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