Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Goodwill [Line Items]
Beginning balance	$ 28.7	$ 29.9
Acquisition		0.8
Effect of exchange rate changes	0	(2.0)
Ending balance	28.7	28.7
Asia [Member]
Goodwill [Line Items]
Beginning balance	0.5	0.5
Acquisition		0
Effect of exchange rate changes	0	0
Ending balance	0.5	0.5
Europe [Member]
Goodwill [Line Items]
Accumulated goodwill impairment losses	8.7
North America [Member]
Goodwill [Line Items]
Accumulated goodwill impairment losses	23.8
South America [Member]
Goodwill [Line Items]
Beginning balance	12.2	13.5
Acquisition		0
Effect of exchange rate changes	(1.3)	(1.3)
Ending balance	10.9	12.2
Commercial Products [Member]
Goodwill [Line Items]
Beginning balance	16.0	15.9
Acquisition		0.8
Effect of exchange rate changes	1.3	(0.7)
Ending balance	$ 17.3	$ 16.0