CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net earnings (loss)	$ 2.8	$ (8.4)
Other comprehensive income (loss):
Foreign currency translation	5.2	5.4
Defined benefit plans, net of income taxes of $0 and $0.4 million	3.4	1.2
Cash flow hedges, net of income taxes of $0 and $0.3 million	(0.4)	1.0
Total other comprehensive income	8.2	7.6
Comprehensive income (loss)	11.0	(0.8)
Comprehensive income attributable to noncontrolling interest	(0.7)	(0.3)
Comprehensive income (loss) attributable to Modine	$ 10.3	$ (1.1)