Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 28, 2019	Jun. 29, 2019
Statement Of Financial Position [Abstract]
Accounts receivable, allowances	$ 27.4	$ 22.0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000.0	1,000,000,000.0
Common stock, shares issued	104,200,000	103,800,000
Common stock, shares outstanding	104,200,000	103,800,000
Accumulated other comprehensive loss, tax benefit	$ 0.5	$ 0.1