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Other Financial Statement Details - Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 3,670.5		$ 3,670.5		$ 3,526.1
Less: accumulated depreciation and amortization	2,517.0		2,517.0		2,342.4
Total property, plant and equipment, net	1,153.5		1,153.5		1,183.7
Depreciation expense	39.0	$ 41.2	78.5	$ 84.2
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	99.6		99.6		84.8
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	710.8		710.8		705.9
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	2,431.3		2,431.3		2,311.3
Projects in process
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 428.8		$ 428.8		$ 424.1

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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