Inventories - By Category (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019
Inventory Disclosure [Abstract]
Finished goods	$ 145.6	$ 147.3
Work in progress	43.7	39.8
Purchased components	70.4	76.7
Raw materials	54.9	53.9
Inventories at First-in, First-Out ("FIFO") cost	314.6	317.7
Adjustment to state inventories at Last-in, First-Out ("LIFO") cost	2.9	(1.2)
Inventories, net	$ 317.5	$ 316.5