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Acquisitions and Dispositions, Acquisition of Scott Springfield Mfg. Inc. (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 01, 2024
Acquisition of Scott Springfield Mfg. Inc. [Abstract] |  |  |  |  |  |  |
Business acquisition, net of cash acquired |  |  | $ 186.2 |  | $ 0.0 | $ 0.0 |
Allocation of Purchase Price [Abstract] |  |  |  |  |  |  |
Goodwill | $ 230.9 |  | 230.9 |  | 165.6 | $ 168.1 |
Scott Springfield Manufacturing [Member] |  |  |  |  |  |  |
Acquisition of Scott Springfield Mfg. Inc. [Abstract] |  |  |  |  |  |  |
Consideration transferred, net of cash acquired |  |  |  |  |  |  | $ 183.8
Business acquisition, net of cash acquired |  |  | 181.4 |  |  |  |
Remaining payable for business acquisition | 2.4 |  | $ 2.4 |  |  |  |
Net sales prior to acquisition |  |  |  | $ 110.0 |  |  |
Period net sales are included in consolidated statement of operations |  |  | 1 month |  |  |  |
Net sales since date of acquisition | 7.9 |  |  |  |  |  |
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 | 102.3 |  | $ 102.3 |  |  |  | 102.3
Goodwill |  |  |  |  |  |  | 65.2
Other assets |  |  |  |  |  |  | 4.0
Accounts payable |  |  |  |  |  |  | (8.6)
Accrued compensation and employee benefits |  |  |  |  |  |  | (1.3)
Deferred income taxes |  |  |  |  |  |  | (24.4)
Other liabilities |  |  |  |  |  |  | (7.8)
Purchase price |  |  |  |  |  |  | 184.1
Write-up of acquired inventory |  |  |  |  |  |  | $ 3.2
Unaudited Supplemental Pro Forma Information [Abstract] |  |  |  |  |  |  |
Net sales |  |  | 2,507.5 |  | 2,346.2 |  |
Net earnings attributable to Modine |  |  | 164.3 |  | 126.3 |  |
Pro forma adjustment for annual amortization and depreciation expense |  |  | 9.0 |  | 20.0 |  |
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 [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Allocation of Purchase Price [Abstract] |  |  |  |  |  |  |
Intangible assets | 66.9 |  | $ 66.9 |  |  |  |
Weighted-average useful life of acquired intangible assets |  |  | 12 years |  |  |  |
Scott Springfield Manufacturing [Member] | Order Backlog [Member] |  |  |  |  |  |  |
Allocation of Purchase Price [Abstract] |  |  |  |  |  |  |
Intangible assets | 22.6 |  | $ 22.6 |  |  |  |
Weighted-average useful life of acquired intangible assets |  |  | 1 year |  |  |  |
Scott Springfield Manufacturing [Member] | Trade Names [Member] |  |  |  |  |  |  |
Allocation of Purchase Price [Abstract] |  |  |  |  |  |  |
Intangible assets | 12.8 |  | $ 12.8 |  |  |  |
Weighted-average useful life of acquired intangible assets |  |  | 10 years |  |  |  |
Scott Springfield Manufacturing [Member] | SG&A Expenses [Member] |  |  |  |  |  |  |
Acquisition of Scott Springfield Mfg. Inc. [Abstract] |  |  |  |  |  |  |
Costs related to acquisition | 2.1 |  | $ 2.1 |  |  |  |
Scott Springfield Manufacturing [Member] | Cost of Sales [Member] |  |  |  |  |  |  |
Allocation of Purchase Price [Abstract] |  |  |  |  |  |  |
Fair value write-up adjustment to acquired inventory | $ 1.6 |  |  |  |  |  |
Scott Springfield Manufacturing [Member] | Cost of Sales [Member] | Plan [Member] |  |  |  |  |  |  |
Allocation of Purchase Price [Abstract] |  |  |  |  |  |  |
Fair value write-up adjustment to acquired inventory |  | $ 1.6 |  |  |  |  |

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