Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017
Segment Reporting Information [Abstract]
Net sales	$ 515.5	$ 347.2
Gross profit	$ 88.5	$ 62.3
Gross profit (% of sales)	17.20%	17.90%
Operating income	$ 27.6	$ 15.8
Total assets	1,520.2		$ 1,449.5
Operating Segments [Member]
Segment Reporting Information [Abstract]
Net sales	520.5	350.8
Gross profit	$ 88.5	$ 64.9
Gross profit (% of sales)	17.00%	18.50%
Operating income	$ 37.2	$ 27.3
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Abstract]
Net sales	148.3	140.0
Gross profit	$ 26.5	$ 25.2
Gross profit (% of sales)	17.90%	18.00%
Operating income	$ 12.1	$ 9.6
Total assets	283.2		282.9
Operating Segments [Member] | Europe [Member]
Segment Reporting Information [Abstract]
Net sales	136.3	146.0
Gross profit	$ 19.3	$ 25.3
Gross profit (% of sales)	14.20%	17.30%
Operating income	$ 7.9	$ 15.3
Total assets	294.6		269.4
Operating Segments [Member] | Asia [Member]
Segment Reporting Information [Abstract]
Net sales	35.4	24.9
Gross profit	$ 6.3	$ 4.4
Gross profit (% of sales)	17.70%	17.60%
Operating income	$ 3.3	$ 1.5
Total assets	114.5		111.3
Operating Segments [Member] | Commercial and Industrial Solutions [Member]
Segment Reporting Information [Abstract]
Net sales	157.5	0.0
Gross profit	$ 25.3	$ 0.0
Gross profit (% of sales)	16.00%	0.00%
Operating income	$ 10.8	$ 0.0
Total assets	610.7		576.0
Operating Segments [Member] | Building HVAC [Member]
Segment Reporting Information [Abstract]
Net sales	43.0	39.9
Gross profit	$ 11.1	$ 10.0
Gross profit (% of sales)	25.90%	25.10%
Operating income	$ 3.1	$ 0.9
Total assets	95.5		85.2
Corporate and Eliminations [Member]
Segment Reporting Information [Abstract]
Net sales	(5.0)	(3.6)
Gross profit	$ 0.0	$ (2.6)
Gross profit (% of sales)	0.00%	0.00%
Operating income	$ (9.6)	$ (11.5)
Total assets	$ 121.7		$ 124.7