CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Common stock [Member]	Additional Paid-in Capital [Member]	Retained earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury stock, at cost [Member]	Non-controlling interest [Member]	Total
Balance at Mar. 31, 2015	$ 30.4	$ 180.6	$ 359.8	$ (198.6)	$ (16.2)	$ 4.6	$ 360.6
Balance (in shares) at Mar. 31, 2015	48.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to Modine	$ 0.0	0.0	(1.6)	0.0	0.0	0.0	(1.6)
Other comprehensive income (loss)	0.0	0.0	0.0	24.4	0.0	(0.1)	24.3
Stock options and awards including related tax benefits	$ 0.2	0.1	0.0	0.0	0.0	0.0	0.3
Stock options and awards including related tax benefits (in shares)	0.4
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(7.8)	0.0	(7.8)
Stock-based compensation expense	0.0	4.9	0.0	0.0	0.0	0.0	4.9
Contribution by noncontrolling interest	0.0	0.0	0.0	0.0	0.0	2.3	2.3
Dividend paid to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	(0.9)	(0.9)
Net earnings attributable to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	0.6	0.6
Balance at Mar. 31, 2016	$ 30.6	185.6	358.2	(174.2)	(24.0)	6.5	382.7
Balance (in shares) at Mar. 31, 2016	49.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to Modine	$ 0.0	0.0	14.2	0.0	0.0	0.0	14.2	[1]
Other comprehensive income (loss)	0.0	0.0	0.0	(7.6)	0.0	0.0	(7.6)
Shares issued for acquisition of Luvata HTS	$ 1.4	22.9	0.0	0.0	0.0	0.0	24.3
Shares issued for acquisition of Luvata HTS (in shares)	2.2
Stock options and awards including related tax benefits	$ 0.4	0.5	0.0	0.0	0.0	0.0	0.9
Stock options and awards including related tax benefits (in shares)	0.6
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(1.4)	0.0	(1.4)
Stock-based compensation expense	0.0	7.4	0.0	0.0	0.0	0.0	7.4
Net earnings attributable to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	0.7	0.7
Balance at Mar. 31, 2017	$ 32.4	216.4	372.4	(181.8)	(25.4)	7.2	$ 421.2
Balance (in shares) at Mar. 31, 2017	51.8						51.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting guidance - stock-based compensation (Note 1)	$ 0.0	0.1	0.3	0.0	0.0	0.0	$ 0.4
Net earnings (loss) attributable to Modine	0.0	0.0	22.2	0.0	0.0	0.0	22.2	[2]
Other comprehensive income (loss)	0.0	0.0	0.0	41.5	0.0	0.5	42.0
Stock options and awards including related tax benefits	$ 0.3	3.9	0.0	0.0	0.0	0.0	4.2
Stock options and awards including related tax benefits (in shares)	0.5
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(1.7)	0.0	(1.7)
Stock-based compensation expense	0.0	9.5	0.0	0.0	0.0	0.0	9.5
Dividend paid to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	(0.9)	(0.9)
Net earnings attributable to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	1.6	1.6
Balance at Mar. 31, 2018	$ 32.7	$ 229.9	$ 394.9	$ (140.3)	$ (27.1)	$ 8.4	$ 498.5
Balance (in shares) at Mar. 31, 2018	52.3						52.3

[1] During fiscal 2017, restructuring expenses totaled $2.3 million, $2.1 million, $1.6 million, and $4.9 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 5). During fiscal 2017, the Company sold two previously-closed manufacturing facilities in its Americas segment and a facility in its Europe segment and recognized net gains totaling $1.2 million and $0.8 million in the quarters ended September 30, 2016 and March 31, 2017, respectively. During fiscal 2017, costs directly related to the acquisition and integration of Luvata HTS totaled $1.4 million, $3.0 million, $7.2 million, and $3.2 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 2). During the fourth quarter of fiscal 2017, the Company recorded a deferred tax valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded income tax expense of $2.0 million (see Note 7).

[2] During fiscal 2018, restructuring expenses totaled $1.7 million, $0.4 million, $9.4 million, and $4.5 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 5). During the third quarter of fiscal 2018, the Company recorded a $1.3 million asset impairment charge related to a manufacturing facility in Austria (see Note 5). During the fourth quarter of fiscal 2018, the Company recorded a $1.2 million impairment charge related to intangible assets (see Note 12). During fiscal 2018, costs directly related to the acquisition and integration of Luvata HTS totaled $1.6 million, $1.1 million, $1.0 million, and $0.6 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 2). The Company recorded charges totaling $35.7 million and $2.3 million resulting for certain income tax effects of recently-enacted U.S. tax legislation in the quarters ended December 31, 2017 and March 31, 2018, respectively (see Note 7). During the fourth quarter of fiscal 2018, the Company reversed a portion of a valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded an income tax benefit of $2.8 million (see Note 7).