Acquisitions Acquisitions (Narrative) (Details) shares in Thousands, € in Millions, AUD in Millions, $ in Millions		3 Months Ended				12 Months Ended
	Aug. 17, 2017 USD ($) shares	Nov. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)	May 31, 2015 EUR (€)	Nov. 30, 2011 USD ($)	Nov. 30, 2017 EUR (€) shares	Nov. 30, 2017 USD ($) shares	Aug. 17, 2017 USD ($)	Nov. 30, 2016 AUD	Nov. 30, 2016 USD ($)	Nov. 30, 2015 USD ($)	Feb. 28, 2015 EUR (€)	Dec. 31, 2017 USD ($)	May 31, 2017 EUR (€)	May 31, 2017 USD ($)	Nov. 30, 2015 EUR (€)	Nov. 30, 2015 USD ($)	May 31, 2015 USD ($)
Business Acquisition [Line Items]
Transaction expenses included in cost of goods sold		$ 15.0	$ 5.9
Useful life						12 years	12 years
Goodwill		4,490.1					$ 4,490.1			$ 1,771.4
Other debt costs							15.4			0.0	$ 0.0
Total		31.3	$ 30.4				40.8
Intangible asset amortization expense							16.3			11.3	7.3
Purchase of minority interest							1.2			0.0	0.0
Contingent consideration, liability		0.0		€ 25.2			0.0			28.9				€ 26.1	$ 29.3		$ 27.1	$ 27.7
Payments of contingent consideration				5.0		€ 17.6	19.7			0.0	0.0
Change in unrealized gain (loss)							1.6
Transaction costs		$ 2.9					2.9			5.5							$ 3.6
Reckitt Benckiser's Food Division [Member]
Business Acquisition [Line Items]
Cash acquired	$ 24.3							$ 24.3
Working capital adjustments	11.2							11.2
Net sales							5,209.0	570.0		4,969.3
Transaction expenses included in cost of goods sold							$ 20.9
Indefinite-lived brand assets	2,475.0							2,475.0
Definite-lived intangible assets	120.0							120.0
Useful life						15 years	15 years
Goodwill	$ 2,546.3							$ 2,546.3
Anticipated transaction cost							$ 100.0
Anticipated acquisition cost, current							60.0
Other debt costs							15.4
Revenue from acquisition							190.1
Total							77.1
Earnings or loss of acquiree since acquisition date, actual							42.0
Amortization and depreciation							8.0
Payments to acquire businesses, net of cash acquired							$ 4,205.7
Reckitt Benckiser's Food Division [Member] | Common Class A [Member]
Business Acquisition [Line Items]
Equity issued to fund acquisition (in shares) | shares	6,350					6,350	6,350
Reckitt Benckiser's Food Division [Member] | Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Total							$ 40.8
Kohinoor Specialty Foods [Member]
Business Acquisition [Line Items]
Ownership interest		15.00%					15.00%
Buyout of minority interest							$ 0.6
Payments to acquire businesses, net of cash acquired							1.6
Purchase of minority interest							1.2
Consideration transferred					$ 113.0
Giotti [Member]
Business Acquisition [Line Items]
Net sales | €						€ 53.0
Indefinite-lived brand assets		$ 4.8					4.8
Definite-lived intangible assets		31.5					$ 31.5
Useful life						11 years 11 months	11 years 11 months
Goodwill		80.5					$ 80.5
Revenue from acquisition							66.5
Tangible net assets		7.0					7.0
Payments to acquire businesses, net of cash acquired							123.8
Cash acquired from acquisition							1.2
Cash received, working capital adjustment							0.2
Cajun Injector [Member]
Business Acquisition [Line Items]
Net sales										5.0
Consideration transferred										4.4
Gourmet Garden [Member]
Business Acquisition [Line Items]
Net sales | AUD									AUD 70
Indefinite-lived brand assets		27.6					27.6
Definite-lived intangible assets		18.9					$ 18.9
Useful life						14 years 2 months	14 years 2 months
Goodwill		53.7					$ 53.7
Revenue from acquisition							27.3
Tangible net assets		16.0					16.0
Business combinations, final goodwill adjustments		$ 7.6					7.6
Finite-lived intangible assets, purchase accounting adjustments							4.7
Adjustment, tangible assets							4.4
Payments to acquire businesses, net of cash acquired										116.2
Cash acquired from acquisition										3.3
Cash received, working capital adjustment										1.9
Indefinite-lived intangible assets, purchase accounting adjustments							$ 7.3
Stubbs [Member]
Business Acquisition [Line Items]
Net sales											30.0
Indefinite-lived brand assets										27.1
Definite-lived intangible assets										$ 24.4
Useful life									13 years 11 months	13 years 11 months
Goodwill										$ 61.6
Tangible net assets										5.7
Business combinations, final goodwill adjustments										19.0
Finite-lived intangible assets, purchase accounting adjustments										11.9
Adjustment, tangible assets										0.3
Intangible asset amortization expense										0.9
Consideration transferred											99.4
Cash acquired from acquisition											0.8
Indefinite-lived intangible assets, purchase accounting adjustments										13.8
Liabilities assumed										7.0
Liabilities										$ 19.4
D&A [Member]
Business Acquisition [Line Items]
Net sales | €												€ 50.0
Payments to acquire businesses, net of cash acquired											49.0
Cash acquired from acquisition											2.8
Range of outcomes, value, high | €																€ 35.0
Contingent consideration, liability				€ 25.0														$ 27.7
Brand Aromatics [Member]
Business Acquisition [Line Items]
Net sales											30.0
Consideration transferred											$ 62.4
Subsequent Event [Member] | Reckitt Benckiser's Food Division [Member]
Business Acquisition [Line Items]
Working capital adjustments													$ 4.2