Revenue Recognition, Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021
Disaggregation of Revenue [Abstract]
Net sales	$ 478.9	$ 461.4	$ 973.5	$ 809.2
Contract Balances [Abstract]
Contract assets	10.4		10.4		$ 5.7
Contract liabilities	7.1		7.1		$ 5.6
Increase in contract assets			4.7
Increase in contract liabilities			1.5
Products Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Net sales	468.6	452.8	954.7	793.6
Products Transferred Over Time [Member]
Disaggregation of Revenue [Abstract]
Net sales	23.6	19.4	46.2	34.8
Americas [Member]
Disaggregation of Revenue [Abstract]
Net sales	262.7	221.8	505.2	383.4
Europe [Member]
Disaggregation of Revenue [Abstract]
Net sales	174.0	184.4	379.3	320.8
Asia [Member]
Disaggregation of Revenue [Abstract]
Net sales	55.5	66.0	116.4	124.2
Commercial HVAC&R [Member]
Disaggregation of Revenue [Abstract]
Net sales	193.7	159.8	374.2	291.9
Data Center Cooling [Member]
Disaggregation of Revenue [Abstract]
Net sales	17.3	15.7	35.5	34.1
Industrial Cooling [Member]
Disaggregation of Revenue [Abstract]
Net sales	16.8	18.6	34.0	35.7
Commercial Vehicle [Member]
Disaggregation of Revenue [Abstract]
Net sales	80.5	65.3	163.8	113.7
Off-Highway [Member]
Disaggregation of Revenue [Abstract]
Net sales	78.1	58.9	159.3	113.0
Automotive and Light Vehicle [Member]
Disaggregation of Revenue [Abstract]
Net sales	79.8	125.6	179.7	193.0
Other [Member]
Disaggregation of Revenue [Abstract]
Net sales	26.0	28.3	54.4	47.0
Segment Total [Member]
Disaggregation of Revenue [Abstract]
Net sales	492.2	472.2	1,000.9	828.4
BHVAC [Member]
Disaggregation of Revenue [Abstract]
Net sales	77.5	68.5	144.1	122.6
BHVAC [Member] | Products Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Net sales	74.3	66.4	139.4	117.3
BHVAC [Member] | Products Transferred Over Time [Member]
Disaggregation of Revenue [Abstract]
Net sales	3.2	2.1	4.7	5.3
BHVAC [Member] | Americas [Member]
Disaggregation of Revenue [Abstract]
Net sales	45.1	38.5	76.6	64.5
BHVAC [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Net sales	32.4	30.0	67.5	58.1
BHVAC [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
BHVAC [Member] | Commercial HVAC&R [Member]
Disaggregation of Revenue [Abstract]
Net sales	60.1	52.5	107.3	88.0
BHVAC [Member] | Data Center Cooling [Member]
Disaggregation of Revenue [Abstract]
Net sales	17.3	15.7	35.5	34.1
BHVAC [Member] | Industrial Cooling [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
BHVAC [Member] | Commercial Vehicle [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
BHVAC [Member] | Off-Highway [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
BHVAC [Member] | Automotive and Light Vehicle [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
BHVAC [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.1	0.3	1.3	0.5
CIS [Member]
Disaggregation of Revenue [Abstract]
Net sales	153.5	128.2	307.6	244.7
CIS [Member] | Products Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Net sales	141.8	119.1	283.2	225.6
CIS [Member] | Products Transferred Over Time [Member]
Disaggregation of Revenue [Abstract]
Net sales	11.7	9.1	24.4	19.1
CIS [Member] | Americas [Member]
Disaggregation of Revenue [Abstract]
Net sales	83.2	67.8	165.3	128.0
CIS [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Net sales	60.8	46.9	126.3	91.5
CIS [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Net sales	9.5	13.5	16.0	25.2
CIS [Member] | Commercial HVAC&R [Member]
Disaggregation of Revenue [Abstract]
Net sales	133.6	107.3	266.9	203.9
CIS [Member] | Data Center Cooling [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
CIS [Member] | Industrial Cooling [Member]
Disaggregation of Revenue [Abstract]
Net sales	16.8	18.6	34.0	35.7
CIS [Member] | Commercial Vehicle [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
CIS [Member] | Off-Highway [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
CIS [Member] | Automotive and Light Vehicle [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
CIS [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Net sales	3.1	2.3	6.7	5.1
HDE [Member]
Disaggregation of Revenue [Abstract]
Net sales	195.8	165.6	397.6	289.1
HDE [Member] | Products Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Net sales	187.1	157.4	380.5	278.7
HDE [Member] | Products Transferred Over Time [Member]
Disaggregation of Revenue [Abstract]
Net sales	8.7	8.2	17.1	10.4
HDE [Member] | Americas [Member]
Disaggregation of Revenue [Abstract]
Net sales	126.7	98.6	246.3	166.5
HDE [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Net sales	35.4	32.1	76.6	56.2
HDE [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Net sales	33.7	34.9	74.7	66.4
HDE [Member] | Commercial HVAC&R [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
HDE [Member] | Data Center Cooling [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
HDE [Member] | Industrial Cooling [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
HDE [Member] | Commercial Vehicle [Member]
Disaggregation of Revenue [Abstract]
Net sales	76.9	61.5	156.1	107.8
HDE [Member] | Off-Highway [Member]
Disaggregation of Revenue [Abstract]
Net sales	77.0	58.1	156.9	111.5
HDE [Member] | Automotive and Light Vehicle [Member]
Disaggregation of Revenue [Abstract]
Net sales	20.4	28.0	40.8	41.0
HDE [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Net sales	21.5	18.0	43.8	28.8
Automotive [Member]
Disaggregation of Revenue [Abstract]
Net sales	65.4	109.9	151.6	172.0
Automotive [Member] | Products Transferred at a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Net sales	65.4	109.9	151.6	172.0
Automotive [Member] | Products Transferred Over Time [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
Automotive [Member] | Americas [Member]
Disaggregation of Revenue [Abstract]
Net sales	7.7	16.9	17.0	24.4
Automotive [Member] | Europe [Member]
Disaggregation of Revenue [Abstract]
Net sales	45.4	75.4	108.9	115.0
Automotive [Member] | Asia [Member]
Disaggregation of Revenue [Abstract]
Net sales	12.3	17.6	25.7	32.6
Automotive [Member] | Commercial HVAC&R [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
Automotive [Member] | Data Center Cooling [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
Automotive [Member] | Industrial Cooling [Member]
Disaggregation of Revenue [Abstract]
Net sales	0.0	0.0	0.0	0.0
Automotive [Member] | Commercial Vehicle [Member]
Disaggregation of Revenue [Abstract]
Net sales	3.6	3.8	7.7	5.9
Automotive [Member] | Off-Highway [Member]
Disaggregation of Revenue [Abstract]
Net sales	1.1	0.8	2.4	1.5
Automotive [Member] | Automotive and Light Vehicle [Member]
Disaggregation of Revenue [Abstract]
Net sales	59.4	97.6	138.9	152.0
Automotive [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 1.3	$ 7.7	$ 2.6	$ 12.6