Special Charges and Other, Net - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Costs associated with restructuring	$ 15.0	$ 18.0
Asset impairment charges		2.5
Net charges related to legal settlements	(0.2)	(15.7)	$ 30.2
Employee separation costs	(1.3)	6.0	65.3
Contract exit costs (income)	(1.6)	5.2	(4.7)
Restructuring reserve	15.9
Colorada Springs
Restructuring Cost and Reserve [Line Items]
Costs associated with restructuring	8.0
Other
Restructuring Cost and Reserve [Line Items]
Costs associated with restructuring	7.0
Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring cost incurred		8.2
Contract Termination | Semiconductor Products
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, costs incurred to date	(0.4)
Other Relocation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring cost incurred		6.6
Employee Separation | Semiconductor Products
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, costs incurred to date	71.2
Employee separation costs	$ (1.3)	$ 6.0	$ 65.3