Acquisition of Luvata HTS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended			9 Months Ended
	Nov. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2016
Allocation of Purchase price for Acquisition [Abstract]
Goodwill		$ 173.2			$ 173.2		$ 15.8
Pro Forma Information [Abstract]
Interest expense		4.5	$ 2.7		10.5	$ 8.2
Commercial and Industrial Solutions ("CIS") [Member]
Business Acquisition [Line Items]
Net sales		34.7			34.7
Operating loss		0.3			0.3
Allocation of Purchase price for Acquisition [Abstract]
Goodwill		159.2			159.2		$ 0.0
Luvata HTS [Member]
Business Acquisition [Line Items]
Acquired ownership interest by the entity	100.00%
Purchase price allocation, net of cash	$ 388.2
Increase in common stock value due to shares issued for acquisition	1.4
Increase in additional paid-in capital due to shares issued for acquisition	22.9
Allocation of Purchase price for Acquisition [Abstract]
Cash and cash equivalents	27.4
Trade accounts receivable	86.3
Inventories	48.8
Property, plant and equipment	116.5
Intangible assets	105.9
Goodwill	159.8
Other assets	31.0
Accounts payable	(66.2)
Deferred income taxes	(30.0)
Pensions	(14.3)
Other liabilities	(49.6)
Purchase price	415.6
Pro Forma Information [Abstract]
Net sales		447.6	454.5		1,398.1	1,418.1
Net earnings (loss) attributable to Modine		10.4	13.1		28.8	(3.8)
Estimated additional amortization and depreciation expense		$ 3.0	$ 3.0		$ 3.0	$ 3.0
Acquisition related transaction costs				$ 8.6
Inventory purchase accounting adjustments				$ 4.3
Net earnings (loss) per share attributable to Modine Shareholders [Abstract]
Basic (in dollars per share)		$ 0.21	$ 0.26		$ 0.58	$ (0.08)
Diluted (in dollars per share)		$ 0.21	$ 0.26		$ 0.58	$ (0.08)
Luvata HTS [Member] | Minimum [Member]
Business Acquisition [Line Items]
Period of time required for shares to be held					1 year
Weighted-average useful life, intangible assets, amortization period					12 years
Pro Forma Information [Abstract]
Interest expense		$ 3.0	$ 3.0		$ 3.0	$ 3.0
Luvata HTS [Member] | Maximum [Member]
Business Acquisition [Line Items]
Weighted-average useful life, intangible assets, amortization period					14 years
Pro Forma Information [Abstract]
Interest expense		4.0	$ 4.0		$ 4.0	$ 4.0
Luvata HTS [Member] | Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Cost related to acquisition and integration		$ 7.2			$ 11.6
Luvata HTS [Member] | Customer Relationships [Member]
Allocation of Purchase price for Acquisition [Abstract]
Intangible assets	44.5
Luvata HTS [Member] | Trade Names [Member]
Allocation of Purchase price for Acquisition [Abstract]
Intangible assets	43.4
Luvata HTS [Member] | Product Technology [Member]
Allocation of Purchase price for Acquisition [Abstract]
Intangible assets	$ 18.0
Luvata HTS [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Purchase price allocation (in shares)	2.2
Purchase price allocation, value	$ 24.3