Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019		Jun. 30, 2019
Statement of Financial Position [Abstract]
Commercial Paper	$ 3,536.7	[1]	$ 0.0
Allowance for doubtful accounts - trade receivables - Current	59.3		54.9
Allowance for doubtful accounts - trade receivables - Long-term	$ 0.6		$ 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)	433,400,000		434,200,000
Treasury stock, (in shares)	205,300,000		204,500,000

[1] (B) The Company reclassified $3,535.5 million of funds held for clients to short-term marketable securities as a result of proceeds from commercial paper borrowings as of September 30, 2019 which were utilized to pay our client obligations.