Other Financial Statement Details - Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2020	Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, gross	$ 899.0	$ 938.9
Less allowance for expected credit losses	5.2	4.9
Total accounts receivable, net	893.8	934.0
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, gross	887.9	924.1
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, gross	$ 11.1	$ 14.8