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, 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 attributable to Modine	$ 0.0	0.0	14.2	0.0	0.0	0.0	14.2
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	$ 0.4	0.5	0.0	0.0	0.0	0.0	0.9
Stock options and awards (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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting guidance (Note 1)	$ 0.0	0.1	0.3	0.0	0.0	0.0	0.4
Net earnings attributable to Modine	0.0	0.0	22.2	0.0	0.0	0.0	22.2	[1]
Other comprehensive income (loss)	0.0	0.0	0.0	41.5	0.0	0.5	42.0
Stock options and awards	$ 0.3	3.9	0.0	0.0	0.0	0.0	4.2
Stock options and awards (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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting guidance (Note 1)	$ 0.0	0.0	(7.6)	0.0	0.0	0.0	$ (7.6)
Net earnings attributable to Modine	0.0	0.0	84.8	0.0	0.0	0.0	84.8	[2]
Other comprehensive income (loss)	0.0	0.0	0.0	(38.1)	0.0	(0.5)	(38.6)
Stock options and awards	$ 0.3	0.8	0.0	0.0	0.0	0.0	1.1
Stock options and awards (in shares)	0.5
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(4.3)	0.0	(4.3)
Stock-based compensation expense	0.0	7.9	0.0	0.0	0.0	0.0	7.9
Dividend paid to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	(1.8)	(1.8)
Net earnings attributable to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	1.1	1.1
Balance at Mar. 31, 2019	$ 33.0	$ 238.6	$ 472.1	$ (178.4)	$ (31.4)	$ 7.2	$ 541.1
Balance (in shares) at Mar. 31, 2019	52.8						52.8

[1] 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 6). 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 6). During the fourth quarter of fiscal 2018, the Company recorded a $1.2 million impairment charge related to intangible assets (see Note 14). The Company recorded income tax charges totaling $35.7 million and $2.3 million during the third and fourth quarters of fiscal 2018, respectively, related to the Tax Act (see Note 8). 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 8).

[2] During fiscal 2019, restructuring expenses totaled $0.2 million, $0.5 million, and $8.9 million for the quarters ended June 30, 2018, December 31, 2018, and March 31, 2019, respectively (see Note 6). During the second quarter of fiscal 2019, the Company sold its South African business within the BHVAC segment and, as a result, recorded a loss of $1.7 million (see Note 1). During the third quarter of fiscal 2019, the Company recorded a $0.4 million impairment charge related to a manufacturing facility in Austria (see Note 6). The Company's income tax benefit for fiscal 2019 includes net benefits of $24.4 million and net charges of $2.2 million in the second and third quarters, respectively, related to the Tax Act and the recognition of foreign tax credits (see Note 8). During fiscal 2019, the Company adjusted its valuation allowances on deferred tax assets related to two separate subsidiaries in China and, as a result, recorded a $2.0 million income tax benefit and a $1.0 million income tax charge in the first and second quarters, respectively (see Note 8).