Notes Payable and Long-Term Debt (Additional Information) (Details) - Senior Notes	Feb. 29, 2020	Jan. 15, 2020
4.900% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	4.90%
3.600% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	3.60%	3.60%
5.625% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	5.625%
4.700% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	4.70%
3.950% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	3.95%