Segment Information - Summary of segment assets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Mar. 31, 2025
Segment Information
Total assets	$ 2,482.9	$ 1,917.6
Other
Segment Information
Total assets	1,370.9	1,097.8
Operating segments | Climate Solutions
Segment Information
Total assets	756.6	448.7
Operating segments | Performance Technologies
Segment Information
Total assets	$ 355.4	$ 371.1