Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Jun. 30, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts - trade receivables - Current	$ 53.1	$ 54.9
Allowance for doubtful accounts - trade receivables - Long-term	$ 0.5	$ 0.4
Preferred stock, par value (in US$ per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	300,000	300,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in US$ per share)	$ 0.1	$ 0.1
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	638,700,000	638,700,000
Common stock, shares outstanding (in shares)	431,800,000	434,200,000
Treasury stock, (in shares)	206,900,000	204,500,000