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Employee Benefit And Retirement Plans (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Nov. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2017 | Aug. 31, 2018 | Feb. 28, 2018 | Feb. 28, 2017
Employee Benefit And Retirement Plans [Line Items] |  |  |  |  |  |
Unrecognized actuarial losses and unrecognized prior service credit, before tax | $ 303.0 |  |  |  |  |
Unrecognized actuarial losses and unrecognized prior service credit, net of tax | 234.0 | $ 117.8 |  |  |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax |  |  |  |  | $ 18.0 | $ 76.7
Expected actuarial losses, net of prior service credit, before tax | 5.6 |  |  |  |  |
Expected actuarial losses, net of prior service credit, net of tax | 4.1 |  |  |  |  |
Amortization of net actuarial loss | 9.6 |  |  |  |  |
Amortization of prior service costs credits | 4.0 |  |  |  |  |
Fair value of plan assets at beginning of year | 0.0 | 0.0 | $ 0.0 |  |  |
Business combinations | 2.4 |  |  |  |  |
Dividends paid | $ 302.2 | $ 273.4 | 237.6 |  |  |
Assumed annual increase in cost of health care benefits | 6.50% | 7.30% |  |  |  |
Ultimate health care cost trend rate | 4.50% | 4.50% |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment |  | $ 17.5 | 77.7 |  |  |
Defined Contribution Retirement Plans [Member] |  |  |  |  |  |
Employee Benefit And Retirement Plans [Line Items] |  |  |  |  |  |
Fair value of McCormick stock held in plan assets | $ 266.1 |  |  |  |  |
Number of shares of McCormick stock held in plan assets | 1.6 |  |  |  |  |
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 | $ 28.2 | 15.5 | 12.2 |  |  |
Dividends paid | 3.9 |  |  |  |  |
Supplemental Employee Retirement Plan [Member] |  |  |  |  |  |
Employee Benefit And Retirement Plans [Line Items] |  |  |  |  |  |
Benefit obligation | 105.4 | 94.9 |  |  |  |
Non-current pension asset | 85.5 | 82.8 |  |  |  |
Other Postretirement Benefits [Member] |  |  |  |  |  |
Employee Benefit And Retirement Plans [Line Items] |  |  |  |  |  |
Benefit obligation | $ 67.2 | $ 62.9 | 70.9 |  |  |
Age after which employees retire | 55 years |  |  |  |  |
Minimum number of years in service | 5 years |  |  |  |  |
Assumed discount rate | 3.10% | 4.50% |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment |  | $ 27.1 |  |  |  |
Employer contributions | $ 3.9 | 4.8 |  |  |  |
U.S. Equity Securities [Member] |  |  |  |  |  |
Employee Benefit And Retirement Plans [Line Items] |  |  |  |  |  |
Fair value of McCormick stock held in plan assets | $ 64.4 | $ 57.2 |  |  |  |
Number of shares of McCormick stock held in plan assets | 0.4 | 0.4 |  |  |  |
Percentage of pension plan assets in equity securities | 9.60% | 8.90% |  |  |  |
Dividends paid | $ 0.9 | $ 0.8 |  |  |  |
Reckitt Benckiser's Food Division [Member] |  |  |  |  |  |
Employee Benefit And Retirement Plans [Line Items] |  |  |  |  |  |
Funded status | (18.1) |  |  | $ (20.5) |  |
Employer contributions | 1.8 | 2.5 |  |  |  |
United States |  |  |  |  |  |
Employee Benefit And Retirement Plans [Line Items] |  |  |  |  |  |
Unrecognized actuarial losses and unrecognized prior service credit, net of tax | 183.9 | 97.7 |  |  |  |
Benefit obligation | 884.8 | 752.6 | 813.7 |  |  |
Fair value of plan assets at beginning of year | 671.9 | 640.4 | 654.2 |  |  |
Accrued liability related to the plan | 212.9 | 112.2 |  |  |  |
Non-current pension asset | 0.0 | 0.0 |  |  |  |
Funded status | (212.9) | (112.2) |  |  |  |
Accumulated benefit obligation | 874.8 | 746.9 |  |  |  |
Business combinations | $ 0.0 | $ (2.4) |  |  |  |
Percentage of pension plan assets in equity securities | 100.00% | 100.00% |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment |  |  | 69.9 |  |  |
Employer contributions | $ 8.2 | $ 8.9 |  |  |  |
United States | U.S. Equity Securities [Member] |  |  |  |  |  |
Employee Benefit And Retirement Plans [Line Items] |  |  |  |  |  |
Fair value of plan assets at beginning of year | 276.5 | 283.2 |  |  |  |
Foreign Plan [Member] |  |  |  |  |  |
Employee Benefit And Retirement Plans [Line Items] |  |  |  |  |  |
Unrecognized actuarial losses and unrecognized prior service credit, net of tax | 60.1 | 40.1 |  |  |  |
Benefit obligation | 345.6 | 292.9 | 341.5 |  |  |
Fair value of plan assets at beginning of year | 340.9 | 306.5 | 331.3 |  |  |
Accrued liability related to the plan | 20.3 | 17.6 |  |  |  |
Non-current pension asset | 15.6 | 31.2 |  |  |  |
Funded status | (4.7) | 13.6 |  |  |  |
Accumulated benefit obligation | $ 342.2 | $ 286.8 |  |  |  |
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 | $ 7.8 |  |  |
Employer contributions | $ 3.2 | $ 4.6 |  |  |  |

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