Property, Plant, and Equipment (Details) - USD ($) $ in Millions	Jun. 30, 2026	Mar. 31, 2026
Property, Plant, and Equipment
Property, Plant, and Equipment	$ 851.2	$ 868.8
Less: accumulated depreciation	(668.6)	(681.6)
Net property, plant and equipment	182.6	187.2
Land
Property, Plant, and Equipment
Property, Plant, and Equipment	5.4	5.7
Buildings and improvements
Property, Plant, and Equipment
Property, Plant, and Equipment	$ 158.2	165.4
Buildings and improvements \| Minimum
Property, Plant, and Equipment
Useful life	10 years
Buildings and improvements \| Maximum
Property, Plant, and Equipment
Useful life	40 years
Machinery and equipment
Property, Plant, and Equipment
Property, Plant, and Equipment	$ 629.3	638.8
Machinery and equipment \| Minimum
Property, Plant, and Equipment
Useful life	3 years
Machinery and equipment \| Maximum
Property, Plant, and Equipment
Useful life	15 years
Office equipment
Property, Plant, and Equipment
Property, Plant, and Equipment	$ 34.8	34.9
Office equipment \| Minimum
Property, Plant, and Equipment
Useful life	3 years
Office equipment \| Maximum
Property, Plant, and Equipment
Useful life	10 years
Construction in progress
Property, Plant, and Equipment
Property, Plant, and Equipment	$ 23.5	$ 24.0

Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

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Amount, after accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

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Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

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