Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Jun. 30, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts - trade receivables - Current	$ 51.9	$ 49.6
Allowance for doubtful accounts - trade receivables - Long-term	$ 0.4	$ 0.8
Preferred stock, par value (in US$ per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	300,000.0	300,000.0
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)	441,700,000	445,000,000
Treasury stock, (in shares)	197,000,000	193,700,000