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Employee Benefit And Retirement Plans (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2018
Feb. 28, 2019
Employee Benefit And Retirement Plans [Line Items]        
Unrecognized actuarial losses and unrecognized prior service credit, before tax $ 383.4      
Unrecognized actuarial losses and unrecognized prior service credit, net of tax 296.3 $ 234.0    
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax       $ 18.0
Expected actuarial losses, net of prior service credit, before tax 13.5      
Expected actuarial losses, net of prior service credit, net of tax 9.7      
Amortization of net actuarial loss 13.2      
Amortization of prior service costs credits 0.3      
Fair value of plan assets at beginning of year 0.0 0.0 $ 0.0  
Dividends paid $ 330.1 $ 302.2 273.4  
Assumed annual increase in cost of health care benefits 6.80% 6.50%    
Ultimate health care cost trend rate 4.50% 4.50%    
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment     17.5  
Defined Contribution Retirement Plans [Member]        
Employee Benefit And Retirement Plans [Line Items]        
Percentage of participant contribution considered for first condition of plan 100.00%      
Percentage of participant salary under first condition of plan 3.00%      
Percentage of participant contribution considered for second condition of plan 66.70%      
Percentage of participant salary under second condition of plan 3.00%      
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage 3.00%      
Defined Contribution Plan, Cost $ 30.8 $ 28.2 15.5  
Dividends paid 3.8 3.9    
Supplemental Employee Retirement Plan [Member]        
Employee Benefit And Retirement Plans [Line Items]        
Benefit obligation 110.5 105.4    
Non-current pension asset 86.4 85.5    
Other Postretirement Benefits [Member]        
Employee Benefit And Retirement Plans [Line Items]        
Benefit obligation $ 70.7 $ 67.2 62.9  
Age after which employees retire 55 years      
Minimum number of years in service 5 years      
Assumed discount rate 2.30% 3.10%    
Employer contributions $ 4.3 $ 3.9    
U.S. Equity Securities [Member]        
Employee Benefit And Retirement Plans [Line Items]        
Fair value of McCormick stock held in plan assets $ 50.6 $ 64.4    
Number of shares of McCormick stock held in plan assets 0.6 0.8    
Percentage of pension plan assets in equity securities 7.40% 9.60%    
Defined Benefit Plan, Equity Securities, US [Member]        
Employee Benefit And Retirement Plans [Line Items]        
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held $ 0.9 $ 0.9    
Defined Benefit Plan, Equity Securities [Member] | Defined Contribution Retirement Plans [Member]        
Employee Benefit And Retirement Plans [Line Items]        
Fair value of McCormick stock held in plan assets $ 267.3      
Number of shares of McCormick stock held in plan assets 2.9      
United States        
Employee Benefit And Retirement Plans [Line Items]        
Unrecognized actuarial losses and unrecognized prior service credit, net of tax $ 235.5 183.9    
Benefit obligation 958.0 884.8 752.6  
Fair value of plan assets at beginning of year 688.2 671.9 640.4  
Accrued liability related to the plan 269.8 212.9    
Non-current pension asset 0.0 0.0    
Funded status (269.8) (212.9)    
Accumulated benefit obligation $ 945.1 $ 874.8    
Percentage of pension plan assets in equity securities 100.00% 100.00%    
Employer contributions $ 10.4 $ 8.2    
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 40.6 42.5 43.4  
Foreign Plan [Member]        
Employee Benefit And Retirement Plans [Line Items]        
Unrecognized actuarial losses and unrecognized prior service credit, net of tax 63.7 60.1    
Benefit obligation 371.7 345.6 292.9  
Fair value of plan assets at beginning of year 368.7 340.9 306.5  
Accrued liability related to the plan 22.6 20.3    
Non-current pension asset 19.6 15.6    
Funded status (3.0) (4.7)    
Accumulated benefit obligation $ 367.9 $ 342.2    
Percentage of pension plan assets in equity securities 100.00% 100.00%    
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment     17.5  
Employer contributions $ 1.5 $ 3.2    
Defined Benefit Plan, Expected Return (Loss) on Plan Assets $ 15.3 $ 16.4 $ 16.6