Goodwill and Intangible Assets Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Oct. 11, 2016
Intangible assets subject to amortization:
Accumulated amortization	$ (404.0)	$ (662.3)	$ (404.0)
Intangible assets not subject to amortization:
Total Gross	14,435.9	14,958.8	14,435.9
Total Net	14,031.9	14,296.5	14,031.9
Goodwill	8,250.1	8,405.5	8,250.1	$ 1,983.3	$ 6,415.6
Loss on goodwill impairment			15.7
Brands
Intangible assets subject to amortization:
Gross	4,876.3	5,215.3	4,876.3
Accumulated amortization	(288.2)	(516.0)	(288.2)
Net	4,588.1	4,699.3	4,588.1
Indefinite-Lived Intangible Assets (Excluding Goodwill)	8,114.2	$ 8,216.6	$ 8,114.2
Brands | Minimum
Intangible assets subject to amortization:
Useful life		10 years	10 years
Brands | Maximum
Intangible assets subject to amortization:
Useful life		50 years	50 years
License agreements and distribution rights
Intangible assets subject to amortization:
Gross	225.9	$ 236.3	$ 225.9
Accumulated amortization	(89.4)	(103.9)	(89.4)
Net	136.5	$ 132.4	$ 136.5
License agreements and distribution rights | Minimum
Intangible assets subject to amortization:
Useful life		15 years	15 years
License agreements and distribution rights | Maximum
Intangible assets subject to amortization:
Useful life		28 years	28 years
Distribution networks
Intangible assets subject to amortization:
Indefinite-Lived Intangible Assets (Excluding Goodwill)	752.6	$ 804.7	$ 752.6
Other Intangible Assets [Member]
Intangible assets subject to amortization:
Gross	129.3	148.3	129.3
Accumulated amortization	(26.4)	(42.4)	(26.4)
Net	102.9	105.9	102.9
Indefinite-Lived Intangible Assets (Excluding Goodwill)	337.6	$ 337.6	$ 337.6
Other Intangible Assets [Member] | Minimum
Intangible assets subject to amortization:
Useful life		2 years	2 years
Other Intangible Assets [Member] | Maximum
Intangible assets subject to amortization:
Useful life		40 years	40 years
Brands Reclassifed As Finite Lived [Member] | Minimum
Intangible assets subject to amortization:
Useful life		30 years
Brands Reclassifed As Finite Lived [Member] | Maximum
Intangible assets subject to amortization:
Useful life		50 years
Canada
Intangible assets not subject to amortization:
Percentage Of Fair Value Exceeding Carrying Value		26.00%
Goodwill	567.6	$ 932.1	$ 567.6	551.4
Loss on goodwill impairment			$ 0.0
Brand Impairment | Canada
Intangible assets not subject to amortization:
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 495.2
Europe [Member] | Brand Impairment
Intangible assets not subject to amortization:
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)				$ 275.0
Millercoors [Member]
Details of intangible assets, other than goodwill:
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					9,875.0
Intangible assets not subject to amortization:
Goodwill					$ 6,323.5