Goodwill And Intangible Assets (Schedule Of Amortized And Non-Amortized Intangible Assets) (Details) - USD ($) $ in Millions	Nov. 30, 2017	Aug. 17, 2017	Nov. 30, 2016	Nov. 30, 2015
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Gross carrying amount	$ 329.1		$ 161.1
Finite-lived intangible assets, Accumulated amortization	66.5		48.4
Goodwill	4,490.1		1,771.4
Indefinite-lived intangible assets, total	7,298.6		2,083.6
Total goodwill and intangible assets, Gross carrying amount	7,627.7		2,244.7
Total goodwill and intangible assets, Accumulated amortization	66.5		48.4
Goodwill [Member]
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Goodwill	4,490.1		1,771.4
Brand Names [Member]
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	2,808.5		312.2
Reckitt Benckiser's Food Division [Member]
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived brand assets		$ 2,475.0
Goodwill		2,546.3
Definite-lived intangible assets		120.0
Giotti [Member]
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived brand assets	4.8
Goodwill	80.5
Definite-lived intangible assets	31.5
Consumer Segment [Member]
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Goodwill	3,385.4		1,608.3	$ 1,587.7
Business combinations, final goodwill adjustments	7.1
Consumer Segment [Member] | Reckitt Benckiser's Food Division [Member]
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Goodwill		1,697.5
Industrial Segment [Member]
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Goodwill	$ 1,104.7		$ 163.1	$ 171.6
Industrial Segment [Member] | Reckitt Benckiser's Food Division [Member]
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Goodwill		$ 848.8