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Notes Payable and Long-Term Debt (Additional Information) (Details) - USD ($)
$ in Millions
Aug. 31, 2020
Jul. 13, 2020
Jan. 15, 2020
Debt Instrument [Line Items]      
Letters of credit and surety bonds $ 120.3    
Unused letters of credit $ 94.0    
Senior Notes | 4.900% Senior Notes      
Debt Instrument [Line Items]      
Senior notes, stated interest rate (as a percent) 4.90%    
Senior Notes | 4.700% Senior Notes      
Debt Instrument [Line Items]      
Senior notes, stated interest rate (as a percent) 4.70%    
Senior Notes | 3.950% Senior Notes      
Debt Instrument [Line Items]      
Senior notes, stated interest rate (as a percent) 3.95%    
Senior Notes | 3.600% Senior Notes      
Debt Instrument [Line Items]      
Senior notes, stated interest rate (as a percent) 3.60%   3.60%
Senior Notes | 3.000% Senior Notes      
Debt Instrument [Line Items]      
Senior notes, stated interest rate (as a percent) 3.00% 3.00%