Other Financial Statements Details Accounts Receivable (Details) - USD ($) $ in Millions	Jun. 30, 2018	Apr. 01, 2018	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable amounts	$ 791.5		$ 565.9
Less allowance for doubtful accounts	2.1		2.2
Accounts receivable, net	789.4	$ 518.1	563.7
Trade Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable amounts	782.6		557.8
Other Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable amounts	$ 8.9		$ 8.1