Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares shares in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]
Treasury stock acquired (in shares)	0.6	3.5	2.4
Treasury stock reissued (in shares)	1.5	1.4	2.3
Dividends declared (in dollars per share)	$ 2.16	$ 1.94	$ 1.46