Other Income and Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		0 Months Ended	3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 29, 2012	Sep. 24, 2011	Sep. 29, 2012	Sep. 24, 2011	May 03, 2012 Senior Notes [Member]	Sep. 29, 2012 Bridge facility fees		Sep. 24, 2011 Bridge facility fees		Sep. 29, 2012 Bridge facility fees		Sep. 24, 2011 Bridge facility fees		Sep. 29, 2012 Euro currency purchase loss		Sep. 24, 2011 Euro currency purchase loss		Sep. 29, 2012 Euro currency purchase loss		Sep. 24, 2011 Euro currency purchase loss		Sep. 29, 2012 Gain (loss) from Foster's swap and related financial instruments		Sep. 24, 2011 Gain (loss) from Foster's swap and related financial instruments		Sep. 29, 2012 Gain (loss) from Foster's swap and related financial instruments		Sep. 24, 2011 Gain (loss) from Foster's swap and related financial instruments		Sep. 29, 2012 Gain (loss) from other foreign exchange and derivative activity		Sep. 24, 2011 Gain (loss) from other foreign exchange and derivative activity		Sep. 29, 2012 Gain (loss) from other foreign exchange and derivative activity		Sep. 24, 2011 Gain (loss) from other foreign exchange and derivative activity		Sep. 29, 2012 Environmental reserve	Sep. 24, 2011 Environmental reserve	Sep. 29, 2012 Environmental reserve	Sep. 24, 2011 Environmental reserve	Sep. 29, 2012 Other, net	Sep. 24, 2011 Other, net	Sep. 29, 2012 Other, net	Sep. 24, 2011 Other, net	Sep. 29, 2012 Molson Coors Central Europe (MCCE) Gain (loss) from other foreign exchange and derivative activity	Sep. 29, 2012 Molson Coors Central Europe (MCCE) Gain (loss) from other foreign exchange and derivative activity
Other income and expense:
Other income (expense), net	$ (6.4)	$ (2.3)	$ (78.3)	$ (4.8)		$ 0	[1]	$ 0	[1]	$ (13.0)	[1]	$ 0	[1]	$ 0	[2]	$ 0	[2]	$ (57.9)	[2]	$ 0	[2]	$ 0	[3]	$ 0	[3]	$ 0	[3]	$ 0.8	[3]	$ (6.4)	[4]	$ (2.7)	[4]	$ (8.7)	[4]	$ (6.7)	[4]	$ (0.1)	$ 0	$ (0.1)	$ (0.1)	$ 0.1	$ 0.4	$ 1.4	$ 1.2
Proceeds from issuance of senior long-term debt					1,880.7
Loss on foreign currency movements																																														$ 6.4	$ 5.8

[1] See Note 13, "Debt" for further discussion.

[2] In connection with the Acquisition, we used the proceeds from our issuance of the $1.9 billion senior notes to purchase Euros in the second quarter of 2012. As a result of a negative foreign exchange movement between the Euro and USD prior to using these proceeds to fund the Acquisition, we realized a foreign exchange loss on our Euro cash holdings.

[3] During the first quarter of 2011, we settled our remaining Foster's Group Limited's ("Fosters") total return swap and related financial instruments.

[4] Included in this amount is $6.4 million and $5.8 million of losses for the third quarter of 2012 and first three quarters of 2012, respectively, related to foreign currency movements on foreign-denominated financing instruments entered into in conjunction with the closing of the Acquisition. See Note 13, "Debt" for further discussion of financing activities related to the Acquisition.