Borrowings - Narrative (Details) - USD ($)			3 Months Ended
	Nov. 30, 2021	Jul. 31, 2021	Aug. 31, 2021	Feb. 28, 2021	Nov. 30, 2017	Oct. 31, 2017	May 31, 2017
Schedule of Debt [Line Items]
Short-term borrowings	$ 243,000,000.0			$ 0
Unamortized debt issuance costs, long-term debt obligations	59,900,000
Unamortized discount, long-term debt obligations	19,100,000
Unsecured debt
Schedule of Debt [Line Items]
Basis points above adjusted treasury rate		15.00%
2.25% July 2021 Senior Notes | Unsecured debt
Schedule of Debt [Line Items]
Debt instrument, face amount		$ 1,000,000,000
Coupon rates of notes		2.25%
Proceeds from issuance of long-term debt, net of discount and debt issuance costs	987,200,000
Percentage of outstanding principal amount as redemption price		100.00%
2.70% May 2017 Senior Notes | Unsecured debt
Schedule of Debt [Line Items]
Debt instrument, face amount							$ 500,000,000
Coupon rates of notes							2.70%
Percentage of outstanding principal amount as redemption price			100.00%
Make-whole payment			$ 26,600,000
2.65% November 2017 Senior Notes | Unsecured debt
Schedule of Debt [Line Items]
Debt instrument, face amount					$ 700,000,000
Coupon rates of notes					2.65%
Percentage of outstanding principal amount as redemption price			100.00%
Make-whole payment			$ 26,600,000
Commercial paper
Schedule of Debt [Line Items]
Debt instrument, face amount	243,000,000					$ 2,000,000,000
Short-term borrowings	$ 243,000,000			$ 0
Interest rate	0.30%
Weighted average remaining term	6 days