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Leases (Tables) | 9 Months Ended
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Dec. 31, 2024
Leases |
Leases recorded on consolidated balance sheets | The following table provides a summary of leases recorded on the consolidated balance sheets. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Balance Sheet Location |  | December 31, 2024 |  | March 31, 2024
Lease Assets |  |  |  | ​ |  |  | ​ |
Operating lease ROU assets |  | Other noncurrent assets | ​ | $ | 96.4 | ​ | $ | 76.0
Finance lease ROU assets (a) |  | Property, plant and equipment - net | ​ |  | 6.8 | ​ |  | 6.5
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Lease Liabilities |  |  | ​ |  | ​ | ​ |  |
Operating lease liabilities |  | Other current liabilities | ​ | $ | 19.7 | ​ | $ | 15.3
Operating lease liabilities |  | Other noncurrent liabilities | ​ |  | 78.5 | ​ |  | 62.1
Finance lease liabilities |  | Long-term debt - current portion | ​ |  | 0.5 | ​ |  | 0.4
Finance lease liabilities |  | Long-term debt | ​ |  | 2.2 | ​ |  | 1.9
____ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
(a) | Finance right of use (“ROU”) assets were recorded net of accumulated amortization of $4.0 million and $3.7 million as of December 31, 2024 and March 31, 2024, respectively.
Components of Lease Expense | Components of lease expense The components of lease expense were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended December 31, | ​ | Nine months ended December 31,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
Operating lease expense (a) | ​ | $ | 8.5 | ​ | $ | 6.1 | ​ | $ | 23.1 | ​ | $ | 17.6
Finance lease expense: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Depreciation of ROU assets | ​ |  | 0.1 | ​ |  | 0.1 | ​ |  | 0.4 | ​ |  | 0.4
Interest on lease liabilities | ​ |  | — | ​ |  | — | ​ |  | 0.1 | ​ |  | 0.1
Total lease expense | ​ | $ | 8.6 | ​ | $ | 6.2 | ​ | $ | 23.6 | ​ | $ | 18.1
____ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
(a) | For the three and nine months ended December 31, 2024, operating lease expense included short-term lease expense of $1.7 million and $4.8 million, respectively. For the three and nine months ended December 31, 2023, operating lease expense included short-term lease expense of $1.4 million and $4.3 million, respectively. Variable lease expense was not significant.

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- Definition Tabular disclosure of lessee's right of use assets and lease liabilities. + References No definition available. + Details
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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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- References No definition available. + Details
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