Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares shares in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Statement of Stockholders' Equity [Abstract]
Treasury stock acquired (in shares)	0.1	0.6	3.5
Treasury stock reissued (in shares)	1.2	1.5	1.4
Dividends declared (in dollars per share)	$ 2.30	$ 2.16	$ 1.94