Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2018	Jul. 01, 2017
Statement Of Financial Position [Abstract]
Accounts receivable, allowances	$ 19.3	$ 17.0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	103,200,000	100,800,000
Common stock, shares outstanding	103,200,000	100,800,000
Accumulated other comprehensive income, tax expense	$ 2.9	$ 1.5