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Acquisitions and Dispositions, Acquisition of Scott Springfield Mfg. Inc. (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Mar. 31, 2024
Mar. 01, 2024
Acquisition of Scott Springfield Mfg. Inc. [Abstract]                
Business acquisition, net of cash acquired         $ 3.4 $ 4.8    
Allocation of Purchase Price [Abstract]                
Goodwill   $ 240.7     240.7   $ 230.9  
Scott Springfield Manufacturing                
Acquisition of Scott Springfield Mfg. Inc. [Abstract]                
Business acquisition, net of cash acquired $ 2.4              
Net sales since date of acquisition   53.4     93.1      
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     0.3      
Trade accounts receivable   27.5     27.5      
Inventories   20.9     20.9      
Property, plant and equipment   6.0     6.0      
Intangible assets   92.7     92.7      
Goodwill   72.6     72.6      
Other assets   4.0     4.0      
Accounts payable   (8.6)     (8.6)      
Accrued compensation and employee benefits   (1.3)     (1.3)      
Deferred income taxes   (22.2)     (22.2)      
Other liabilities   (7.8)     (7.8)      
Purchase price   $ 184.1     $ 184.1     $ 184.1
Unaudited Supplemental Pro Forma Information [Abstract]                
Net sales       $ 647.5   1,299.2    
Net earnings attributable to Modine       46.6   91.1    
Pro forma adjustment for amortization and depreciation expense       $ 2.0   5.0    
Pro forma adjustment for estimated interest expense           $ 1.5    
Scott Springfield Manufacturing | Trade names                
Acquisition of Scott Springfield Mfg. Inc. [Abstract]                
Measurement period adjustment to intangible asset     $ (9.6)