Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended										12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013		Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014 Segment		Mar. 31, 2013		Mar. 31, 2012
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	$ 62.3		$ 56.8	$ 57.2	$ 61.9	$ 56.1		$ 48.2	$ 52.6	$ 51.7	$ 238.2		$ 208.6		$ 256.6
Gross profit (% of sales) (in hundredths)											16.10%		15.20%		16.30%
Operating (loss) income											37.2		(0.6)		67.5
Total assets	1,032.3					818.8					1,032.3		818.8
Segment Reporting Information, Additional Information [Abstract]
Total capital expenditures											53.1		49.8		64.4
Total depreciation and amortization expense											58.1		55.8		57.7
Long-lived assets	393.8					382.8					393.8		382.8
Operating income effect between the Corporate and Europe segment for modification in internal financial reporting changes													9.3		11.0
Receivables and cash advance	45										45
Reversal of deferred tax asset valuation allowances	119.2										119.2
Net sales											1,477.6		1,376.0		1,577.2
Revenue from External Customer [Line Items]
Net sales											1,477.6		1,376.0		1,577.2
Modules/Assemblies [Member]
Revenue from External Customer [Line Items]
Net sales											379.9		358.5		410.4
Oil Coolers [Member]
Revenue from External Customer [Line Items]
Net sales											215.4		194.1		249.4
EGR Coolers [Member]
Revenue from External Customer [Line Items]
Net sales											172.5		136.1		152.7
Building HVAC [Member]
Revenue from External Customer [Line Items]
Net sales											159.5		151.8		153.3
Charge-Air Coolers [Member]
Revenue from External Customer [Line Items]
Net sales											157.0		161.8		173.9
Condensers [Member]
Revenue from External Customer [Line Items]
Net sales											129.2		128.8		101.5
Radiators [Member]
Revenue from External Customer [Line Items]
Net sales											129.0		134.4		191.4
Other [Member]
Revenue from External Customer [Line Items]
Net sales											135.1		110.5		144.6
United States [Member]
Segment Reporting Information, Additional Information [Abstract]
Long-lived assets	112.9					115.1					112.9		115.1
Net sales											645.7		637.4		666.2
Germany [Member]
Segment Reporting Information, Additional Information [Abstract]
Long-lived assets	94.6					94.3					94.6		94.3
Net sales											229.5		214.8		285.9
Brazil [Member]
Segment Reporting Information, Additional Information [Abstract]
Net sales											122.0		128.8		169.1
Hungary [Member]
Segment Reporting Information, Additional Information [Abstract]
Net sales											150.3		117.6		149.1
Other [Member]
Segment Reporting Information, Additional Information [Abstract]
Long-lived assets	186.3					173.4					186.3		173.4
Net sales											330.1		277.4		306.9
North America [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit											93.5		81.4		89.7
Gross profit (% of sales) (in hundredths)											16.40%		14.40%		14.90%
Operating (loss) income											42.1		39.2		47.9
Total assets	218.1					218.3					218.1		218.3
Segment Reporting Information, Additional Information [Abstract]
Total capital expenditures											18.9		19.0		15.2
Total depreciation and amortization expense											19.3		20.1		20.0
Net sales											568.7		564.5		602.0
Europe [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit											70.8		61.0		85.1
Gross profit (% of sales) (in hundredths)											12.10%		12.30%		14.10%
Operating (loss) income											9.6	[1]	(25.4)	[1]	26.3	[1]
Total assets	367.9					332.2					367.9		332.2
Segment Reporting Information, Additional Information [Abstract]
Total capital expenditures											22.9		16.5		29.8
Total depreciation and amortization expense											26.6		23.4		26.5
Net sales											584.4		498.0		602.8
South America [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit											20.8		22.5		30.9
Gross profit (% of sales) (in hundredths)											16.90%		16.80%		17.60%
Operating (loss) income											7.5		11.2		10.4
Total assets	80.1					91.8					80.1		91.8
Segment Reporting Information, Additional Information [Abstract]
Total capital expenditures											5.7		3.4		5.2
Total depreciation and amortization expense											3.3		3.7		4.1
Net sales											122.7		133.8		175.6
Asia [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit											8.9		1.7		7.9
Gross profit (% of sales) (in hundredths)											12.50%		2.80%		9.40%
Operating (loss) income											(3.3)		(8.8)		(2.5)
Total assets	92.8					91.3					92.8		91.3
Segment Reporting Information, Additional Information [Abstract]
Total capital expenditures											4.6		7.8		12.5
Total depreciation and amortization expense											6.7		6.4		5.0
Net sales											71.5		59.5		84.1
Commercial Products [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit											43.4		40.8		42.5
Gross profit (% of sales) (in hundredths)											29.60%		29.30%		29.90%
Operating (loss) income											9.4		10.0		14.3
Total assets	132.7	[2]				73.7	[2]				132.7	[2]	73.7	[2]
Segment Reporting Information, Additional Information [Abstract]
Total capital expenditures											1.0		3.1		1.7
Total depreciation and amortization expense											2.2		2.2		2.1
Net sales											146.5		139.3		142.2
Segment Total [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit											237.4		207.4		256.1
Gross profit (% of sales) (in hundredths)											15.90%		14.90%		15.90%
Operating (loss) income											65.3		26.2		96.4
Segment Reporting Information, Additional Information [Abstract]
Net sales											1,493.8		1,395.1		1,606.7
Corporate and Eliminations [Member]
Net sales, gross profit, operating (loss) income and total assets by segment [Abstract]
Gross profit											0.8		1.2		0.5
Gross profit (% of sales) (in hundredths)											0.00%		0.00%		0.00%
Operating (loss) income											(28.1)	[1]	(26.8)	[1]	(28.9)	[1]
Total assets	140.7	[3]				11.5	[3]				140.7	[3]	11.5	[3]
Segment Reporting Information, Additional Information [Abstract]
Net sales											$ (16.2)		$ (19.1)		$ (29.5)

[1] Segment operating income for fiscal 2013 and 2012 has been recast to conform to the fiscal 2014 presentation. The Company has modified its internal financial reporting of intercompany charges for research and development and intercompany royalties between Corporate and the Europe segment, which totaled $9.3 million and $11.0 million for fiscal years 2013 and 2012, respectively. There was no impact on the total Company consolidated financial results.

[2] Total assets within the Commercial Products segment included receivables and cash advances from the Company’s insurance provider and reconstruction costs paid to date related to the Airedale fire, which totaled $45.0 million as of March 31, 2014. See Note 2 for additional information.

[3] The increase in total assets within corporate and eliminations was primarily due to a $119.2 million reversal of deferred tax asset valuation allowances in the U.S. as of March 31, 2014. See Note 8 for additional information.