Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 30, 2019	Jun. 30, 2018
Statement Of Financial Position [Abstract]
Accounts receivable, allowances	$ 25.2	$ 19.3
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	103,800,000	103,200,000
Common stock, shares outstanding	103,800,000	103,200,000
Accumulated other comprehensive income, tax expense	$ 1.2	$ 2.9