CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net earnings	$ 0.6	$ 8.9	$ 3.4	$ 0.5
Other comprehensive income (loss):
Foreign currency translation	(8.0)	17.4	(2.8)	22.8
Defined benefit plans, net of income taxes of $0, $0.4, $0, and $0.8 million	1.6	1.3	5.0	2.5
Cash flow hedges, net of income taxes of $0.1, $0.2, $0.1, and $0.5 million	0.0	0.4	(0.4)	1.4
Total other comprehensive income (loss)	(6.4)	19.1	1.8	26.7
Comprehensive income (loss)	(5.8)	28.0	5.2	27.2
Comprehensive loss (income) attributable to noncontrolling interest	0.2	(0.4)	(0.5)	(0.7)
Comprehensive income (loss) attributable to Modine	$ (5.6)	$ 27.6	$ 4.7	$ 26.5