Goodwill and Intangible Assets Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 29, 2012 years		Dec. 31, 2011 years
Intangible assets subject to amortization:
Total Gross	$ 7,717.6		$ 5,028.7
Accumulated amortization	(490.7)		(442.7)
Total Net	7,226.9		4,586.0
Brands
Intangible assets subject to amortization:
Useful life - minimum (in years)	3		3
Useful life - maximum (in years)	40		40
Gross	475.6	[1]	316.9
Accumulated amortization	(202.2)	[1]	(179.0)
Net	273.4	[1]	137.9
Intangible assets not subject to amortization:
Indefinite-lived intangible assets	5,794.5	[1]	3,322.4
Brands | Molson Coors Central Europe (MCCE)
Intangible assets subject to amortization:
Gross	143.4
Intangible assets not subject to amortization:
Indefinite-lived intangible assets	2,275.4
Finite-Lived Intangible Assets, Useful Life	30
Distribution rights
Intangible assets subject to amortization:
Useful life - minimum (in years)	2		2
Useful life - maximum (in years)	23		23
Gross	355.1		342.0
Accumulated amortization	(254.3)		(234.0)
Net	100.8		108.0
Patents and technology and distribution channels
Intangible assets subject to amortization:
Useful life - minimum (in years)	3		3
Useful life - maximum (in years)	10		10
Gross	35.3		34.9
Accumulated amortization	(30.9)		(28.9)
Net	4.4		6.0
Land use rights and other
Intangible assets subject to amortization:
Useful life - minimum (in years)	2		2
Useful life - maximum (in years)	42		42
Gross	13.2	[1]	6.5
Accumulated amortization	(3.3)	[1]	(0.8)
Net	9.9	[1]	5.7
Land use rights and other | Molson Coors Central Europe (MCCE)
Intangible assets subject to amortization:
Gross	12.0
Intangible assets not subject to amortization:
Finite-Lived Intangible Assets, Useful Life	2
Distribution networks
Intangible assets not subject to amortization:
Indefinite-lived intangible assets	1,028.4		990.5
Other, intangible
Intangible assets not subject to amortization:
Indefinite-lived intangible assets	$ 15.5		$ 15.5

[1] Includes the preliminary fair values of $143.4 million for brand intangibles with a 30 year useful life, $2,275.4 million, as adjusted in the third quarter of 2012, for brand intangibles with an indefinite-life and a preliminary fair value of a favorable supply contract and other intangibles of $12.0 million with a 2 year useful life as a result of the Acquisition. See Note 3, "Acquisition of StarBev" for total allocation of consideration.