Other Financial Statement Details - Accounts Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2020	Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, gross	$ 907.9	$ 938.9
Less allowance for expected credit losses	4.2	4.9
Total accounts receivable, net	903.7	934.0
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, gross	897.4	924.1
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, gross	$ 10.5	$ 14.8