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Acquisitions and Dispositions, Acquisition of Scott Springfield Mfg. Inc. (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 01, 2024
Acquisition of Scott Springfield Mfg. Inc. [Abstract] |  |  |  |  |
Business acquisition, net of cash acquired |  | $ 3.4 | $ 186.2 | $ 0.0 |
Allocation of Purchase Price [Abstract] |  |  |  |  |
Goodwill |  | 233.9 | 230.9 |  |
Scott Springfield Manufacturing |  |  |  |  |
Acquisition of Scott Springfield Mfg. Inc. [Abstract] |  |  |  |  |
Consideration transferred, net of cash acquired |  |  |  |  | $ 184.1
Business acquisition, net of cash acquired |  | 2.4 |  |  |
Net sales since date of acquisition |  | 241.7 | 7.9 |  |
Acquisition adjustment to deferred income tax liability | $ (2.2) |  |  |  |
Acquisition adjustment to goodwill | 7.4 |  |  |  |
Allocation of Purchase Price [Abstract] |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 0.3
Trade accounts receivable |  |  |  |  | 27.5
Inventories |  |  |  |  | 20.9
Property, plant and equipment |  |  |  |  | 6.0
Intangible assets |  |  |  |  | 92.7
Goodwill |  |  | 65.2 |  | 72.6
Other assets |  |  |  |  | 4.0
Accounts payable |  |  |  |  | (8.6)
Accrued compensation and employee benefits |  |  |  |  | (1.3)
Deferred income taxes |  |  |  |  | (22.2)
Other liabilities |  |  |  |  | (7.8)
Purchase price |  |  |  |  | $ 184.1
Unaudited Supplemental Pro Forma Information [Abstract] |  |  |  |  |
Net sales |  |  | 2,507.5 | 2,346.2 |
Net earnings attributable to Modine |  |  | 165.3 | 127.3 |
Pro forma adjustment for annual amortization and depreciation expense |  |  | 8.0 | 19.0 |
Pro forma adjustment for estimated annual interest expense |  | 6.0 | 6.0 |  |
Pro forma adjustment for acquisition-related transaction costs |  |  |  | 2.0 |
Pro forma adjustment for inventory purchase accounting adjustments |  |  |  | $ 3.2 |
Scott Springfield Manufacturing | Trade Names [Member] |  |  |  |  |
Acquisition of Scott Springfield Mfg. Inc. [Abstract] |  |  |  |  |
Measurement period adjustment to intangible asset | $ (9.6) |  |  |  |
Scott Springfield Manufacturing | SG&A Expenses [Member] |  |  |  |  |
Acquisition of Scott Springfield Mfg. Inc. [Abstract] |  |  |  |  |
Costs related to acquisition |  | 0.4 | 2.1 |  |
Scott Springfield Manufacturing | Cost of Sales [Member] |  |  |  |  |
Allocation of Purchase Price [Abstract] |  |  |  |  |
Fair value write-up adjustment to acquired inventory |  | $ 1.6 | $ 1.6 |  |

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