Notes Payable and Long-Term Debt - Schedule of Interest, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Debt Disclosure [Abstract]
Interest Expense	$ 39.9	$ 25.0	$ 78.2	$ 34.1
Capitalized interest	$ (1.5)	$ (7.2)	$ (3.1)	$ (20.8)