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Other Financial Statements Details - Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Receivable amounts $ 670.9   $ 565.9
Less allowance for doubtful accounts 2.1   2.2
Accounts receivable, net 668.8 $ 518.1 563.7
Trade accounts receivable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Receivable amounts 664.6   557.8
Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Receivable amounts $ 6.3   $ 8.1