CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Millions, unless otherwise specified	Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Accumulated other comprehensive loss [Member]	Treasury stock [Member]	Noncontrolling interest [Member]	Deferred compensation trust [Member]	Total
Balance at Mar. 31, 2010	$ 29.2	$ 159.9	$ 188.1	$ (50.3)	$ (13.9)	$ 0	$ (0.3)	$ 312.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings attributable to Modine	0	0	5.2	0	0	0	0	5.2
Other comprehensive (loss) income	0	0	0	27.4	0	0	0	27.4
Stock options and awards including related tax benefits	0.2	1.3	0	0	0	0	0	1.5
Purchase of treasury stock	0	0	0	0	(0.1)		0	(0.1)
Stock-based compensation expense	0	4.0	0	0	0	0	0	4.0
Investment in deferred compensation trust	0	1.2	0	0	0	0	0.3	1.5
Net earnings attributable to noncontrolling interest								0
Balance at Mar. 31, 2011	29.4	166.4	193.3	(22.9)	(14.0)	0	0	352.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings attributable to Modine	0	0	38.5	0	0	0	0	38.5
Other comprehensive (loss) income	0	0	0	(67.4)	0	0	0	(67.4)
Stock options and awards including related tax benefits	0.2	0.3	0	0	0	0	0	0.5
Purchase of treasury stock	0	0	0	0	(0.5)	0	0	(0.5)
Stock-based compensation expense	0	1.6	0	0	0	0	0	1.6
Contribution by noncontrolling interest	0	0	0	0	0	0.9	0	0.9
Net earnings attributable to noncontrolling interest	0	0	0	0	0	0.3	0	0.3
Balance at Mar. 31, 2012	29.6	168.3	231.8	(90.3)	(14.5)	1.2	0	326.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings attributable to Modine	0	0	(24.2)	0	0	0	0	(24.2)
Other comprehensive (loss) income	0	0	0	(38.1)	0	0	0	(38.1)
Stock options and awards including related tax benefits	0.3	(0.2)	0	0	0	0	0	0.1
Purchase of treasury stock	0	0	0	0	(0.1)	0	0	(0.1)
Stock-based compensation expense	0	3.1	0	0	0	0	0	3.1
Net earnings attributable to noncontrolling interest	0	0	0	0	0	1.4	0	1.4
Balance at Mar. 31, 2013	$ 29.9	$ 171.2	$ 207.6	$ (128.4)	$ (14.6)	$ 2.6	$ 0	$ 268.3