Investments Proportional (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended						9 Months Ended
	Sep. 30, 2013		Sep. 28, 2013		Sep. 29, 2012		Sep. 30, 2013		Sep. 28, 2013	Sep. 29, 2012		Dec. 29, 2012	Jun. 30, 2012
Schedule of Equity Method Investments [Line Items]
Equity income in MillerCoors			$ 148.3		$ 132.0				$ 438.3	$ 436.5
MillerCoors
Schedule of Equity Method Investments [Line Items]
Net income attributable to MillerCoors	348.8	[1]	348.8		306.9	[1]	1,033.4	[1]	1,033.4	1,020.5	[1]
MCBC economic interest			42.00%						42.00%			42.00%	42.00%
MCBC proportionate share of MillerCoors net income			146.5		128.9				434.0	428.6
Amortization of the difference between MCBC contributed cost basis and proportional share of the underlying equity in the net assets of MillerCoors			1.2		1.2				3.4	3.1
Share-based compensation adjustment			0.6	[2]	1.9	[2]			0.9	4.8
Equity income in MillerCoors			$ 148.3		$ 132.0				$ 438.3	$ 436.5

[1] Results for the three months and nine months ended September 30, 2013, include special charges of $15.0 million related to restructuring activities. Results for the three months and nine months ended September 30, 2012, include special charges of $18.7 million and $16.4 million, respectively, primarily due to the write-down of assets related to discontinuing the production of the Home Draft package in the U.S.

[2] The net adjustment is to eliminate all share-based compensation impacts related to pre-existing SABMiller plc equity awards held by former Miller employees now employed by MillerCoors.