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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