Other Financial Statement Details - Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Mar. 31, 2023
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 3,987.6		$ 3,987.6		$ 3,829.1
Less: accumulated depreciation and amortization	2,779.3		2,779.3		2,651.2
Total property, plant and equipment, net	1,208.3		1,208.3		1,177.9
Depreciation expense	47.1	$ 55.3	144.6	$ 190.6
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	89.3		89.3		89.3
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	760.6		760.6		716.4
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	2,760.4		2,760.4		2,669.1
Projects in process
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 377.3		$ 377.3		$ 354.3