CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net (loss) earnings	$ (209.5)	$ (2.0)	$ 85.9
Other comprehensive income (loss):
Foreign currency translation	30.9	(19.2)	(37.6)
Defined benefit plans, net of income taxes of $10.4, ($8.3) and ($0.3) million	30.1	(24.6)	(1.4)
Cash flow hedges, net of income taxes of $0.6, ($0.5) and $0.1 million	1.6	(1.5)	0.4
Total other comprehensive income (loss)	62.6	(45.3)	(38.6)
Comprehensive income (loss)	(146.9)	(47.3)	47.3
Comprehensive (income) loss attributable to noncontrolling interest	(1.7)	0.2	(0.6)
Comprehensive income (loss) attributable to Modine	$ (148.6)	$ (47.1)	$ 46.7