Notes Payable and Long-Term Debt - Schedule of Interest, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Debt Disclosure [Abstract]
Interest Expense	$ 40.2	$ 39.9	$ 80.9	$ 78.2
Capitalized interest	$ (1.3)	$ (1.5)	$ (3.1)	$ (3.1)