Revenue (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 29, 2018	Dec. 29, 2018	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Contract asset	$ 3.2	$ 3.2	$ 1.3
Change in Contract with Customer, Liability (Roll Forward)
Balance at beginning of period	72.6	71.9
Revenue deferrals for new contracts	29.3	56.0
Revenue recognized during the period	(30.9)	(56.9)
Balance at end of period	71.0	71.0
Short-term deferred revenue	59.2	59.2	60.6
Long-term deferred revenue	$ 11.8	$ 11.8	$ 11.3
Minimum
Disaggregation of Revenue [Line Items]
Payment period from invoice date		30 days
Maximum
Disaggregation of Revenue [Line Items]
Payment period from invoice date		90 days