Other Financial Statement Details - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 3,096.7	$ 2,966.1
Less: accumulated depreciation and amortization	2,242.0	2,090.0
Total property, plant and equipment, net	854.7	876.1
Depreciation expense	160.6	168.9	$ 180.6
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	83.2	83.4
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	659.7	659.5
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	2,251.1	2,123.1
Projects in process
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 102.7	$ 100.1