Employee Benefit And Retirement Plans (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015	Aug. 31, 2017	Aug. 23, 2017	Feb. 28, 2017
Employee Benefit And Retirement Plans [Line Items]
Unrecognized actuarial losses and unrecognized prior service credit, before tax	$ 225.8
Unrecognized actuarial losses and unrecognized prior service credit, net of tax	152.3	$ 221.3
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	249.7
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	23.9
Expected actuarial losses, net of prior service credit, before tax	4.1
Expected actuarial losses, net of prior service credit, net of tax	3.0
Amortization of net actuarial loss	12.7
Amortization of prior service costs	(8.6)
Fair value of plan assets at beginning of year	0.0	0.0	$ 0.0
Dividends paid	$ 237.6	$ 217.8	204.9
Assumed annual increase in cost of health care benefits	8.00%	7.60%
Ultimate health care cost trend rate	4.50%	4.50%
Ultimate health care cost trend rate, year	2027	2028
Defined Benefit Plan, Effect of Settlements and Curtailments on Accumulated Benefit Obligation						$ 77.7
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Minimum Pension Liability, before Tax						76.7
United States Pension Plans [Member]
Employee Benefit And Retirement Plans [Line Items]
Unrecognized actuarial losses and unrecognized prior service credit, net of tax	$ 112.1	$ 149.2
Benefit obligation	813.7	757.0	722.0
Fair value of plan assets at beginning of year	654.2	558.9	548.6
Accrued liability related to the plan	159.5	198.1
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent		0.0
Funded status	(159.5)	(198.1)
Accumulated benefit obligation	$ 797.6	$ 674.9
Percentage of pension plan assets in equity securities	100.00%	100.00%
Defined Benefit Plan, Effect of Settlements and Curtailments on Accumulated Benefit Obligation						69.9
Employer contributions	$ 11.4	$ 15.4
International Pension Plans [Member]
Employee Benefit And Retirement Plans [Line Items]
Unrecognized actuarial losses and unrecognized prior service credit, net of tax	57.4	76.0
Benefit obligation	341.5	324.9	308.1
Fair value of plan assets at beginning of year	331.3	289.1	288.3
Accrued liability related to the plan	32.7	37.3
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	22.5	1.5
Funded status	(10.2)	(35.8)
Accumulated benefit obligation	$ 317.2	$ 296.9
Percentage of pension plan assets in equity securities	100.00%	100.00%
Defined Benefit Plan, Effect of Settlements and Curtailments on Accumulated Benefit Obligation						$ 7.8
Employer contributions	$ 7.3	$ 9.7
Supplemental Employee Retirement Plan [Member]
Employee Benefit And Retirement Plans [Line Items]
Benefit obligation	105.4	95.5
Accrued liability related to the plan	105.4	91.8
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	89.2	80.6
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]
Employee Benefit And Retirement Plans [Line Items]
Fair value of McCormick stock held in plan assets	$ 196.6
Number of shares of McCormick stock held in plan assets	1.9
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 Recognized	$ 12.2	10.4	9.5
Dividends paid	3.8
Other Postretirement Benefits [Member]
Employee Benefit And Retirement Plans [Line Items]
Benefit obligation	$ 70.9	$ 95.5	$ 92.4
Age after which employees retire	55 years
Minimum number of years in service	5 years
Assumed discount rate	3.60%	4.10%
Defined Benefit Plan, Effect of Settlements and Curtailments on Accumulated Benefit Obligation					$ 27.1
Employer contributions	$ 6.0	$ 5.9
U.S. Equity Securities [Member]
Employee Benefit And Retirement Plans [Line Items]
Fair value of McCormick stock held in plan assets	$ 39.0	$ 35.3
Number of shares of McCormick stock held in plan assets	0.4	0.4
Percentage of pension plan assets in equity securities	6.00%	6.30%
Dividends paid	$ 0.7
U.S. Equity Securities [Member] | United States Pension Plans [Member]
Employee Benefit And Retirement Plans [Line Items]
Fair value of plan assets at beginning of year	305.1	$ 273.0
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				(20.5)
Accumulated benefit obligation				$ 40.9
Employer contributions	$ 5.0