Financing Arrangements (Details)		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)
Line of Credit Facility [Line Items]
Line of credit available	$ 1,465,800,000	$ 1,465,800,000
Commercial paper notes outstanding	$ 534,200,000	534,200,000	$ 303,700,000
Debt to debt-shareholders' equity ratio	0.529
Maximum
Line of Credit Facility [Line Items]
Debt to debt-shareholders' equity ratio, covenant, maximum	0.60
Commercial Paper
Line of Credit Facility [Line Items]
Line of credit	$ 2,000,000,000	2,000,000,000
Domestic Line of Credit
Line of Credit Facility [Line Items]
Line of credit	2,000,000,000	$ 2,000,000,000
Extension option, term (in years)		1 year
Foreign Line of Credit
Line of Credit Facility [Line Items]
Line of credit	62,946,000	$ 62,946,000
Line of credit outstanding	$ 0	$ 0	$ 0
Weighted-average interest rate of notes payable	0.30%	0.30%	0.30%