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