Debt and Credit Arrangements Committed and Uncommitted Credit Facility (Details) - USD ($) $ in Millions		3 Months Ended
	Oct. 25, 2017	Sep. 30, 2017
Committed credit facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date	Oct. 25, 2022	Oct. 20, 2020
Line of credit facility, current borrowing capacity	$ 1,500.0	$ 1,000.0
Line of credit facility, available capacity increase amount		250.0
Line of credit facility, limits on letters of credit		200.0
Line of credit outstanding, amount		0.0
Letters of credit outstanding, amount		8.4
Line of credit facility, remaining borrowing capacity		991.6
Uncommitted credit facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity		916.8
Line of credit outstanding, amount		152.5
Line of credit facility, average outstanding amount		$ 124.7
Line of credit facility, weighted average interest rate		3.10%