Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	$ 364.2	$ 339.9	$ 740.0	$ 690.3
Gross profit	57.2	52.5	119.1	104.2
Gross profit as % of sales (in hundredths)	15.70%	15.50%	16.10%	15.10%
Operating income (loss)	10.6	(6.8)	29.6	(2.9)
Total assets	897.4		897.4		818.8
Operating income effect between the Corporate and Europe segment for modification in internal financial reporting changes		2.3		4.6
North America [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	146.0	143.4	294.7	297.0
Gross profit	25.0	18.5	50.5	42.1
Gross profit as % of sales (in hundredths)	17.10%	12.90%	17.10%	14.20%
Operating income (loss)	11.7	6.9	26.0	20.7
Total assets	214.2		214.2		218.3
Europe [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	138.9	118.8	285.1	244.2
Gross profit	14.7	17.8	34.0	32.5
Gross profit as % of sales (in hundredths)	10.60%	15.00%	11.90%	13.30%
Operating income (loss)	3.3	(12.2)	11.3	(14.7)
Total assets	353.2		353.2		332.2
South America [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	31.8	34.2	66.2	65.4
Gross profit	5.8	5.8	11.9	10.5
Gross profit as % of sales (in hundredths)	18.20%	16.90%	18.00%	16.10%
Operating income (loss)	2.5	4.3	5.1	5.0
Total assets	85.2		85.2		91.8
Asia [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	16.2	13.8	34.5	29.6
Gross profit	1.8	0	4.1	0.4
Gross profit as % of sales (in hundredths)	10.70%	0.20%	11.80%	1.50%
Operating income (loss)	(1.1)	(2.3)	(1.4)	(4.6)
Total assets	91.6		91.6		91.3
Commercial Products [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	34.8	33.9	67.2	64.0
Gross profit	9.8	10.1	18.3	18.0
Gross profit as % of sales (in hundredths)	28.10%	29.90%	27.20%	28.20%
Operating income (loss)	1.2	2.6	2.2	3.6
Total assets	131.1		131.1		73.7
Corporate and eliminations [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	(3.5)	(4.2)	(7.7)	(9.9)
Gross profit	0.1	0.3	0.3	0.7
Gross profit as % of sales (in hundredths)	0.00%	0.00%	0.00%	0.00%
Operating income (loss)	(7.0)	(6.1)	(13.6)	(12.9)
Total assets	22.1		22.1		11.5
Segment total [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	367.7	344.1	747.7	700.2
Gross profit	57.1	52.2	118.8	103.5
Gross profit as % of sales (in hundredths)	15.50%	15.20%	15.90%	14.80%
Operating income (loss)	$ 17.6	$ (0.7)	$ 43.2	$ 10.0