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Acquisitions (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Nov. 30, 2016
Jan. 29, 2016
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Business Acquisition [Line Items]                  
Acquired ownership interest by the entity     100.00%       100.00%    
Net sales             $ 177.7    
Operating income             7.5    
Cost related to acquisition and integration     $ 3.2 $ 7.2 $ 3.0 $ 1.4 14.8    
Allocation of Purchase price for Acquisition [Abstract]                  
Goodwill     165.1       165.1 $ 15.8 $ 16.2
Net earnings per share attributable to Modine Shareholders [Abstract]                  
Interest expense             17.2 11.1 11.7
Purchase price allocation, net of cash             364.2 1.4 $ 0.0
Modine Puxin Thermal System (Jiangsu) Co. Ltd. [Member]                  
Allocation of Purchase price for Acquisition [Abstract]                  
Property, plant and equipment   $ 1.5              
Net earnings per share attributable to Modine Shareholders [Abstract]                  
Ownership percentage by parent   67.00%              
Purchase price allocation, net of cash   $ 1.4              
Additional cash consideration amount     $ 0.3       $ 0.3    
Purchase price allocation resulted in acquired equipment and other assets   2.3              
Purchase price allocation resulted in property, plant and equipment/acquired equipment and other long-lived assets   1.5              
Purchase price allocation, working capital net assets   $ 0.8              
Jiangsu Puxin Heat Exchange System Co., Ltd [Member]                  
Net earnings per share attributable to Modine Shareholders [Abstract]                  
Ownership percentage   33.00%              
Luvata HTS [Member]                  
Business Acquisition [Line Items]                  
Acquired ownership interest by the entity 100.00%                
Purchase price allocation, net of cash acquired $ 388.2                
Period of time required for shares to be held             1 year    
Allocation of Purchase price for Acquisition [Abstract]                  
Cash and cash equivalents 27.4                
Trade accounts receivable 86.3                
Inventories 55.7                
Property, plant and equipment 120.6                
Intangible assets 130.2                
Goodwill 150.6                
Other assets 38.6                
Accounts payable (73.7)                
Accrued compensation and employee benefits (24.3)                
Deferred income taxes (39.3)                
Pensions (14.3)                
Other liabilities (42.2)                
Purchase price 415.6                
Pro Forma Information [Abstract]                  
Net sales             $ 1,881.6 1,871.9  
Net earnings attributable to Modine             $ 35.8 $ 1.5  
Net earnings per share attributable to Modine Shareholders [Abstract]                  
Basic (in dollars per share)             $ 0.72 $ 0.03  
Diluted (in dollars per share)             $ 0.71 $ 0.03  
Amortization and depreciation expense               $ 13.0  
Interest expense               14.0  
Acquisition related transaction costs               8.6  
Inventory purchase accounting adjustment               $ 4.3  
Purchase price allocation resulted in property, plant and equipment/acquired equipment and other long-lived assets 120.6                
Luvata HTS [Member] | Customer Relationships [Member]                  
Allocation of Purchase price for Acquisition [Abstract]                  
Intangible assets $ 58.4                
Weighted-average useful life, intangible assets, amortization period 17 years                
Luvata HTS [Member] | Trade Names [Member]                  
Allocation of Purchase price for Acquisition [Abstract]                  
Intangible assets $ 50.1                
Weighted-average useful life, intangible assets, amortization period 20 years                
Luvata HTS [Member] | Acquired Technology [Member]                  
Allocation of Purchase price for Acquisition [Abstract]                  
Intangible assets $ 21.7                
Weighted-average useful life, intangible assets, amortization period 12 years                
Luvata HTS [Member] | Common Stock [Member]                  
Business Acquisition [Line Items]                  
Shares issued to acquire Luvata HTS (in shares) 2.2                
Value of shares issued to acquire Luvata HTS $ 24.3