Segment and Geographic Information, Total Assets by Segment (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 1,538.0	$ 1,573.4
Operating Segments [Member] | VTS [Member]
Segment Reporting Information [Line Items]
Total assets	749.9	754.8
Operating Segments [Member] | CIS [Member]
Segment Reporting Information [Line Items]
Total assets	604.2	630.2
Operating Segments [Member] | BHVAC [Member]
Segment Reporting Information [Line Items]
Total assets	89.4	88.1
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Total assets	$ 94.5	$ 100.3