Segment and Geographic Information, Net Sales, Gross Profit, and Operating Income by Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018		Mar. 31, 2017		Mar. 31, 2016
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales	$ 566.6	$ 512.7	$ 508.3	$ 515.5	$ 488.3	$ 349.8	$ 317.7	$ 347.2	$ 2,103.1		$ 1,503.0		$ 1,352.5
Gross profit	96.5	85.4	86.1	88.5	85.1	59.0	48.0	62.3	$ 356.5		$ 254.4		$ 233.6
Gross profit (% of sales)									17.00%		16.90%		17.30%
Operating income									$ 92.2		$ 42.3		$ 37.1
Acquisition and integration related costs	$ 0.6	$ 1.0	$ 1.1	$ 1.6	$ 3.2	$ 7.2	$ 3.0	$ 1.4
Luvata HTS [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Acquisition and integration related costs									4.3		14.8
Luvata HTS [Member] | Selling, General and Administrative Expenses [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Acquisition and integration related costs									4.3		14.8
Operating Segments [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									2,126.0		1,519.1		1,370.0
Gross profit									$ 356.1		$ 261.1		$ 236.2
Gross profit (% of sales)									16.80%		17.20%		17.20%
Operating income									$ 135.5		$ 94.5		$ 66.3
Operating Segments [Member] | Americas [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									580.7		534.0		585.5
Gross profit									$ 91.9		$ 87.0		$ 100.3
Gross profit (% of sales)									15.80%		16.30%		17.10%
Operating income									$ 38.2		$ 27.9		$ 36.9
Operating Segments [Member] | Europe [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									568.3		524.3		524.1
Gross profit									$ 83.8		$ 81.6		$ 69.5
Gross profit (% of sales)									14.70%		15.60%		13.30%
Operating income									$ 33.6		$ 38.2		$ 14.7
Operating Segments [Member] | Asia [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									165.8		111.5		79.0
Gross profit									$ 30.3		$ 18.7		$ 12.2
Gross profit (% of sales)									18.30%		16.80%		15.50%
Operating income									$ 17.6		$ 7.7		$ 0.8
Operating Segments [Member] | CIS [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									620.0		177.7		0.0
Gross profit									$ 92.1		$ 26.0		$ 0.0
Gross profit (% of sales)									14.90%		14.60%		0.00%
Operating income									$ 25.8		$ 7.5		$ 0.0
Operating Segments [Member] | BHVAC [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									191.2		171.6		181.4
Gross profit									$ 58.0		$ 47.8		$ 54.2
Gross profit (% of sales)									30.30%		27.80%		29.90%
Operating income									$ 20.3		$ 13.2		$ 13.9
Corporate and Eliminations [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									(22.9)		(16.1)		(17.5)
Gross profit									$ 0.4	[1]	$ (6.7)	[1]	$ (2.6)
Gross profit (% of sales)									0.00%	[1]	0.00%	[1]	0.00%
Operating income									$ (43.3)	[1]	$ (52.2)	[1]	$ (29.2)
Corporate and Eliminations [Member] | Cost of Sales [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Inventory purchase accounting adjustment											$ 4.3

[1] During fiscal 2018 and 2017, the Company recorded $4.3 million and $14.8 million, respectively, of costs incurred directly related to the acquisition and integration of Luvata HTS within SG&A expenses at Corporate. During fiscal 2017, the Company recorded $4.3 million in cost of sales related to an inventory purchase accounting adjustment at Corporate, as the impact was excluded from the Company's measure of segment operating performance.