Employee Benefit And Retirement Plans (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016	Feb. 28, 2018	Aug. 31, 2017	Feb. 28, 2017
Employee Benefit And Retirement Plans [Line Items]
Unrecognized actuarial losses and unrecognized prior service credit, before tax	$ 153.1
Unrecognized actuarial losses and unrecognized prior service credit, net of tax	117.8	$ 152.3
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	160.5			$ 18.0		$ 76.7
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	7.4
Expected actuarial losses, net of prior service credit, before tax	5.1
Expected actuarial losses, net of prior service credit, net of tax	3.9
Amortization of net actuarial loss	2.8
Amortization of prior service costs credits	(7.9)
Fair value of plan assets at beginning of year	0.0	0.0	$ 0.0
Business combinations	2.4
Dividends paid	$ 273.4	$ 237.6	217.8
Assumed annual increase in cost of health care benefits	7.30%	8.00%
Ultimate health care cost trend rate	4.50%	4.50%
Ultimate health care cost trend rate, year	2028	2027
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	$ 266.4
Number of shares of McCormick stock held in plan assets	1.8
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	50.00%
Percentage of participant salary under second condition of plan	2.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage	3.00%
Defined Contribution Plan, Cost	$ 15.5	12.2	10.4
Dividends paid	3.9	3.8
Supplemental Employee Retirement Plan [Member]
Employee Benefit And Retirement Plans [Line Items]
Benefit obligation	94.9	105.4
Non-current pension asset	82.8	89.2
Other Postretirement Benefits [Member]
Employee Benefit And Retirement Plans [Line Items]
Benefit obligation	$ 62.9	$ 70.9	95.5
Age after which employees retire	55 years
Minimum number of years in service	5 years
Assumed discount rate	4.50%	3.60%
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment		$ 27.1
Employer contributions	$ 4.8	6.0
U.S. Equity Securities [Member]
Employee Benefit And Retirement Plans [Line Items]
Fair value of McCormick stock held in plan assets	$ 57.2	$ 39.0
Number of shares of McCormick stock held in plan assets	0.4	0.4
Percentage of pension plan assets in equity securities	8.90%	6.00%
Dividends paid	$ 0.8	$ 0.7
Reckitt Benckiser's Food Division [Member]
Employee Benefit And Retirement Plans [Line Items]
Benefit obligation					$ 48.7
Fair value of plan assets at beginning of year					28.2
Funded status	(18.1)				(20.5)
Accumulated benefit obligation					$ 40.9
Employer contributions	2.5	5.0
Domestic Plan [Member]
Employee Benefit And Retirement Plans [Line Items]
Unrecognized actuarial losses and unrecognized prior service credit, net of tax	97.7	112.1
Benefit obligation	752.6	813.7	757.0
Fair value of plan assets at beginning of year	640.4	654.2	558.9
Accrued liability related to the plan	112.2	159.5
Non-current pension asset	0.0	0.0
Funded status	(112.2)	(159.5)
Accumulated benefit obligation	746.9	797.6
Business combinations	$ (2.4)	$ 48.7
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	$ 8.9	11.4
Domestic Plan [Member] | U.S. Equity Securities [Member]
Employee Benefit And Retirement Plans [Line Items]
Fair value of plan assets at beginning of year	283.2	305.1
Foreign Plan [Member]
Employee Benefit And Retirement Plans [Line Items]
Unrecognized actuarial losses and unrecognized prior service credit, net of tax	40.1	57.4
Benefit obligation	292.9	341.5	324.9
Fair value of plan assets at beginning of year	306.5	331.3	$ 289.1
Accrued liability related to the plan	17.6	32.7
Non-current pension asset	31.2	22.5
Funded status	13.6	(10.2)
Accumulated benefit obligation	$ 286.8	$ 317.2
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	$ 7.8
Employer contributions	$ 4.6	$ 7.3