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Other Financial Statement Details - Property, Plant and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross $ 2,975.8   $ 2,966.1
Less accumulated depreciation and amortization 2,131.8   2,090.0
Total property, plant and equipment, net 844.0   876.1
Depreciation expense 41.1 $ 46.2  
Land      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross 83.4   83.4
Building and building improvements      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross 658.6   659.5
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross 2,144.4   2,123.1
Projects in process      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment, gross $ 89.4   $ 100.1