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Other Financial Statement Details - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 3,526.1	$ 4,013.3
Less: accumulated depreciation and amortization	2,342.4	2,818.7
Total property, plant and equipment, net	1,183.7	1,194.6
Depreciation expense	165.8	190.4	$ 244.7
Capital-Related Grants
Property, Plant and Equipment [Line Items]
Capital-related grants - reduction to property, plant and equipment	46.4	126.5
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	84.8	89.3
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	705.9	796.3
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	2,311.3	2,778.1
Projects in process
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 424.1	$ 349.6

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