Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015 Segment	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Number of reportable segments									5
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit	$ 62.7	$ 59.4	$ 56.7	$ 67.7	$ 62.3	$ 56.8	$ 57.2	$ 61.9	$ 246.5	$ 238.2	$ 208.6
Gross profit (% of sales) (in hundredths)									16.50%	16.10%	15.20%
Operating income (loss)									52.7	37.2	(0.6)
Total assets	931.6				1,032.3				931.6	1,032.3
Segment Reporting Information, Additional Information [Abstract]
Total capital expenditures									58.3	53.1	49.8
Total depreciation and amortization expense									51.6	58.1	55.8
Total property, plant and equipment	322.1				359.6				322.1	359.6
Net sales									1,496.4	1,477.6	1,376.0
Revenue from External Customer [Line Items]
Net sales									1,496.4	1,477.6	1,376.0
Modules/Assemblies [Member]
Revenue from External Customer [Line Items]
Net sales									367.5	379.9	358.5
Oil Coolers [Member]
Revenue from External Customer [Line Items]
Net sales									233.0	215.4	194.1
HVAC Equipment [Member]
Revenue from External Customer [Line Items]
Net sales									199.6	159.5	151.8
EGR Coolers [Member]
Revenue from External Customer [Line Items]
Net sales									183.5	172.5	136.1
Charge Air Coolers [Member]
Revenue from External Customer [Line Items]
Net sales									148.9	157.0	161.8
Condensers [Member]
Revenue from External Customer [Line Items]
Net sales									140.0	129.2	128.8
Radiators [Member]
Revenue from External Customer [Line Items]
Net sales									124.8	129.0	134.4
Other [Member]
Revenue from External Customer [Line Items]
Net sales									99.1	135.1	110.5
Operating Segments [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit									245.2	237.4	207.4
Gross profit (% of sales) (in hundredths)									16.20%	15.90%	14.90%
Operating income (loss)									78.7	65.3	26.2
Segment Reporting Information, Additional Information [Abstract]
Net sales									1,513.1	1,493.8	1,395.1
Operating Segments [Member] | North America [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit									97.0	93.5	81.4
Gross profit (% of sales) (in hundredths)									16.90%	16.40%	14.40%
Operating income (loss)									45.9	42.1	39.2
Total assets	231.8				218.1				231.8	218.1
Segment Reporting Information, Additional Information [Abstract]
Total capital expenditures									25.9	18.9	19.0
Total depreciation and amortization expense									18.1	19.3	20.1
Net sales									573.5	568.7	564.5
Operating Segments [Member] | Europe [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit									68.7	70.8	61.0
Gross profit (% of sales) (in hundredths)									11.90%	12.10%	12.30%
Operating income (loss)									25.7	9.6	(25.4)
Total assets	283.1				367.9				283.1	367.9
Segment Reporting Information, Additional Information [Abstract]
Total capital expenditures									21.5	22.9	16.5
Total depreciation and amortization expense									19.8	26.6	23.4
Net sales									578.2	584.4	498.0
Operating Segments [Member] | South America [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit									12.1	20.8	22.5
Gross profit (% of sales) (in hundredths)									12.80%	16.90%	16.80%
Operating income (loss)									(12.3)	7.5	11.2
Total assets	46.5				80.1				46.5	80.1
Segment Reporting Information, Additional Information [Abstract]
Total capital expenditures									4.3	5.7	3.4
Total depreciation and amortization expense									3.2	3.3	3.7
Net sales									93.9	122.7	133.8
Operating Segments [Member] | Asia [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit									11.5	8.9	1.7
Gross profit (% of sales) (in hundredths)									14.20%	12.50%	2.80%
Operating income (loss)									0.3	(3.3)	(8.8)
Total assets	92.4				92.8				92.4	92.8
Segment Reporting Information, Additional Information [Abstract]
Total capital expenditures									3.8	4.6	7.8
Total depreciation and amortization expense									7.2	6.7	6.4
Net sales									81.2	71.5	59.5
Operating Segments [Member] | Building HVAC [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit									55.9	43.4	40.8
Gross profit (% of sales) (in hundredths)									30.00%	29.60%	29.30%
Operating income (loss)									19.1	9.4	10.0
Total assets	131.4				132.7				131.4	132.7
Segment Reporting Information, Additional Information [Abstract]
Total capital expenditures									2.8	1.0	3.1
Total depreciation and amortization expense									3.3	2.2	2.2
Net sales									186.3	146.5	139.3
Corporate and Eliminations [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit									1.3	0.8	1.2
Gross profit (% of sales) (in hundredths)									0.00%	0.00%	0.00%
Operating income (loss)									(26.0)	(28.1)	(26.8)
Total assets	146.4				140.7				146.4	140.7
Segment Reporting Information, Additional Information [Abstract]
Net sales									(16.7)	(16.2)	(19.1)
Reportable Geographical Components [Member] | United States [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	105.0				100.7				105.0	100.7
Net sales									669.3	645.7	637.4
Reportable Geographical Components [Member] | Germany [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	66.0				81.8				66.0	81.8
Net sales									193.8	229.5	214.8
Reportable Geographical Components [Member] | Hungary [Member]
Segment Reporting Information, Additional Information [Abstract]
Net sales									161.0	150.3	117.6
Reportable Geographical Components [Member] | Austria [Member]
Segment Reporting Information, Additional Information [Abstract]
Net sales									118.7	109.8	97.7
Reportable Geographical Components [Member] | Other European Countries [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	79.9				100.0				79.9	100.0
Reportable Geographical Components [Member] | Brazil [Member]
Segment Reporting Information, Additional Information [Abstract]
Net sales									93.2	122.0	128.8
Reportable Geographical Components [Member] | China [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	36.3				38.9				36.3	38.9
Reportable Geographical Components [Member] | Other [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	34.9				38.2				34.9	38.2
Net sales									$ 260.4	$ 220.3	$ 179.7