Investments Financials (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 30, 2013	Mar. 31, 2012	Dec. 31, 2012		Dec. 29, 2012
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Total equity			$ 7,796.9				$ 7,991.6
MillerCoors
Condensed balance sheets
Current assets	1,026.9						841.4
Noncurrent assets	8,931.4						8,949.9
Total assets	9,958.3						9,791.3
Current liabilities	870.3						958.5
Noncurrent liabilities	1,522.5						1,537.5
Total liabilities	2,392.8						2,496.0
Noncontrolling interests	29.7						28.4
Owners' equity	7,535.8						7,266.9
Total liabilities and equity	9,958.3						9,791.3
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Total equity			7,535.8	7,266.9
MCBC economic interest			42.00%	42.00%
MCBC proportionate share of MillerCoors equity	3,165.0				3,052.1
Difference between MCBC contributed cost basis and proportional share of the underlying equity in net assets of MillerCoors	(669.6)	[1]			(670.8)	[1]
Accounting policy elections			35.0	35.0
Timing differences of cash contributions and distributions as a result of different calendars			0	15.5
Investment in MillerCoors			2,530.4	2,431.8
Results of operations
Net sales	1,788.3			1,759.8
Cost of goods sold	(1,088.7)			(1,070.0)
Gross profit	699.6			689.8
Operating income	$ 274.5			$ 279.0

[1] Our net investment in MillerCoors is based on the carrying values of the net assets contributed to the joint venture which is less than our proportional share of underlying equity (42%) of MillerCoors (contributed by both Coors Brewing Company ("CBC") and Miller Brewing Company ("Miller")). This basis difference, with the exception of certain non-amortizing items (goodwill, land, etc.) is being amortized as additional equity income over the remaining useful lives of the contributed long-lived amortizing assets.