Financing Arrangements (Details)	12 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Line of Credit Facility [Line Items]
Line of credit available	$ 1,466,200,000
Commercial paper notes outstanding	533,800,000	$ 534,200,000
Short-term borrowings	$ 638,466,000	1,008,465,000
Debt to debt-shareholders' equity ratio	0.46
Maximum
Line of Credit Facility [Line Items]
Debt to debt-shareholders' equity ratio, covenant, maximum	0.60
Foreign Banks
Line of Credit Facility [Line Items]
Short-term borrowings	$ 4,255,000
Commercial Paper
Line of Credit Facility [Line Items]
Line of credit	2,000,000,000
Domestic Line of Credit
Line of Credit Facility [Line Items]
Line of credit	$ 2,000,000,000
Extension option, term (in years)	1 year
Foreign Line of Credit
Line of Credit Facility [Line Items]
Line of credit	$ 48,338,000	62,946,000
Line of credit outstanding	$ 0	$ 0
Weighted-average interest rate of notes payable	1.80%	1.00%