Investments Financials (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Nov. 11, 2015
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Total equity	$ 9,919.3		$ 7,063.1
MillerCoors
Condensed balance sheets
Current assets	951.0		800.5
Noncurrent assets	9,044.3		9,099.5
Total assets	9,995.3		9,900.0
Current liabilities	1,002.8		1,180.1
Noncurrent liabilities	1,346.7		1,407.0
Total liabilities	2,349.5		2,587.1
Noncontrolling interests	22.4		20.1
Owners' equity	7,623.4		7,292.8
Total liabilities and equity	9,995.3		9,900.0
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Total equity	$ 7,623.4		$ 7,292.8
MCBC economic interest	42.00%	42.00%	42.00%
MCBC proportionate share of MillerCoors equity	$ 3,201.8		$ 3,063.0
Difference between MCBC contributed cost basis and proportional share of the underlying equity in net assets of MillerCoors	(655.9)		(657.0)
Equity Method Investment, Difference From Accounting Policy Elections	35.0		35.0
Investment in MillerCoors	2,580.9		$ 2,441.0
Results of operations
Net sales	1,816.1	$ 1,774.6
Cost of goods sold	(1,033.0)	(1,076.2)
Gross profit	783.1	698.4
Operating income	336.5	309.3
Net income attributable to MillerCoors	335.3	$ 304.6
Accelerated depreciation expense	35.9
Restructuring costs and special charges	$ 1.0
MillerCoors
Schedule of Equity Method Investments [Line Items]
Business Acquisition, Percentage of Economic Interests Acquired				58.00%
Results of operations
Business Acquisition, Percentage of Voting Interests Acquired				50.00%
Business Acquisition, Percentage of Equity and Voting Interests Acquired				100.00%