Debt Narrative (Details)						3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended								6 Months Ended	3 Months Ended		1 Months Ended									0 Months Ended					3 Months Ended	9 Months Ended
	Sep. 28, 2013 USD ($)		Dec. 29, 2012 USD ($)		Jun. 30, 2007 USD ($)	Sep. 28, 2013 Senior Notes [Member] USD ($)	Sep. 29, 2012 Senior Notes [Member] USD ($)	Sep. 28, 2013 Senior Notes [Member] USD ($)	Sep. 29, 2012 Senior Notes [Member] USD ($)	May 03, 2012 Senior Notes [Member] USD ($)	Sep. 28, 2013 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)	Sep. 29, 2012 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)	Sep. 28, 2013 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)	Sep. 29, 2012 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)	Dec. 29, 2012 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)	Jun. 15, 2007 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)	May 03, 2012 Senior Notes [Member] 2.0% Interest Rate, Maturing 2017 [Member] USD ($)	May 03, 2012 Senior Notes [Member] 3.5% Interest Rate, Maturing 2022 [Member] USD ($)	May 03, 2012 Senior Notes [Member] 5.0% Interest Rate, Maturing 2042 [Member] USD ($)	Sep. 22, 2005 Senior Notes [Member] 5.0% Interest Rate, Maturing 2042 [Member]	Sep. 29, 2012 Line of Credit [Member]	Jun. 25, 2011 Line of Credit [Member] Revolving Multicurrency Bank Credit Facility [Member]	Jun. 30, 2012 Line of Credit [Member] Revolving Multicurrency Bank Credit Facility [Member] USD ($)	Sep. 29, 2012 Revolving Credit [Member]	Sep. 28, 2013 Revolving Credit [Member] USD ($)	Sep. 28, 2013 Revolving Credit [Member] EUR (€)	Apr. 03, 2012 Revolving Credit [Member] USD ($)	Sep. 28, 2013 Tranch 2 [Member] Term Loan Agreement [Member] USD ($)	Sep. 28, 2013 Tranch 2 [Member] Term Loan Agreement [Member] EUR (€)	Apr. 03, 2012 Tranch 2 [Member] Term Loan Agreement [Member] EUR (€)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) USD ($)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) EUR (€)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] USD ($)	Sep. 28, 2013 Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member]	Jun. 15, 2012 Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] EUR (€)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) Senior Notes [Member] USD ($)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) Senior Notes [Member] EUR (€)	Sep. 28, 2013 Equity conversion feature of debt Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] USD ($)	Sep. 28, 2013 Equity conversion feature of debt Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] USD ($)	Aug. 13, 2013 Equity conversion feature of debt Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] USD ($)	Aug. 13, 2013 Equity conversion feature of debt Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] EUR (€)	Sep. 28, 2013 Fair Value, Inputs, Level 3 [Member] USD ($)	Aug. 13, 2013 Fair Value, Inputs, Level 3 [Member] USD ($)	Dec. 29, 2012 Fair Value, Inputs, Level 3 [Member] USD ($)	Jun. 15, 2012 Fair Value, Inputs, Level 3 [Member] Debt [Member] Molson Coors Central Europe (MCCE) EUR (€)
Debt Instrument [Line Items]
Calculation of debt premium conversion price, period following maturity date (trading days)													25 days
Debt instrument, interest rate percentage											2.50%		2.50%			2.50%	2.00%	3.50%	5.00%	5.00%														0.00%
Debt, principal amount, per share																$ 1,000
Debt, convertible conversion price per share											$ 51.8284		$ 51.8284			$ 54.76
Percentage of premium over stock price of convertible debt																25.00%
Debt instrument, convertible number of equity instruments, ratio											19.2944		19.2944			18.263
Interest expense, debt amortization						1,600,000	4,500,000	10,900,000	13,500,000
Interest expense, debt											1,200,000	3,600,000	8,400,000	10,800,000
Effective interest rate percentage											5.75%	5.78%	5.73%	5.79%
Unamortized debt discount															10,800,000
Debt instrument, face amount					575,000,000					1,900,000,000						575,000,000	300,000,000	500,000,000	1,100,000,000							150,000,000				120,000,000					500,000,000
Commercial paper, maximum borrowing capacity	950,000,000
Business acquisition, cost of acquired entity, liabilities incurred																															3,400,000,000	2,700,000,000			500,000,000	585,000,000	500,000,000
Stock available upon conversion of convertible securities (shares)																															12,894,044	12,894,044
Derivative liabilities																																													12,100,000
Discounts to long-term debt																																	1,300,000
Long-term debt	(3,314,300,000)		(4,654,900,000)																									(123,800,000)	(93,700,000)
Derivative Financial Instruments, Liabilities, Fair Value Disclosure																																								14,400,000	10,900,000	0	14,400,000	7,900,000
Unrealized loss, change in fair value of debt convertion feature																																						20,300,000	(6,500,000)
Debt instrument, term																					4 years	4 years		1 year
Revolving credit facility, maximum borrowing capacity																							400,000,000				550,000,000
Commercial paper outstanding, amount	391,100,000
Additional capacity for letters of credit																							100,000,000
Credit facility, current borrowing capacity	0	[1]	0	[1]																					162,300,000
Short-term borrowings	577,500,000		13,200,000
Long-term debt, fair value	$ 3,410,400,000		$ 4,993,000,000

[1] In the first quarter of 2013, a $950 million commercial paper program was approved and implemented. The commercial paper program is supported by our $550 million and $400 million revolving credit facilities. To fund the repayment of our €500 million Zero Coupon Senior Unsecured Convertible Note, we issued short-term commercial paper during the third quarter of 2013. As of September 28, 2013, the outstanding borrowings under the commercial paper program were $391.1 million.In the third quarter of 2012, we entered into a 1-year, €150 million revolving credit agreement, on an uncommitted basis, to support our operations in Central Europe within our Europe segment. In the third quarter of 2013, this revolving credit facility was renewed and restructured and will continue to provide €150 million on an uncommitted basis through September 2014. As of September 28, 2013, the outstanding borrowings under this revolving credit facility were $162.3 million. There were no outstanding borrowings under this revolving credit facility as of December 29, 2012.In the second quarter of 2012, we entered into a 4-year, $550 million revolving credit agreement. This credit agreement contains customary events of default and specified representations and warranties and covenants, including, among other things, covenants that limit our subsidiaries' ability to incur certain additional priority indebtedness, create or permit liens on assets, or engage in mergers or consolidations. As of September 28, 2013, and December 29, 2012, there were no outstanding borrowings under this revolving credit facility. In the second quarter of 2011, we entered into an agreement for a 4-year, $400 million revolving multicurrency credit facility, which provides a $100 million sub-facility available for the issuance of letters of credit. As of September 28, 2013 and December 29, 2012, there were no outstanding borrowings under this revolving credit facility. The remaining outstanding balances as of September 28, 2013, and December 29, 2012, relate to other short-term borrowings.