Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
Mar. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Unless otherwise noted in this report, any description of "we", "us" or "our" includes Molson Coors Brewing Company ("MCBC" or the "Company"), principally a holding company, and its subsidiaries. Our subsidiaries include: Molson Coors Canada, operating in Canada; MillerCoors LLC ("MillerCoors"), which is accounted for by us under the equity method of accounting, operating in the United States ("U.S."); Molson Coors Europe, operating in Czech Republic, Serbia, Croatia, Romania, Bulgaria, Hungary, Montenegro, Bosnia-Herzegovina and Slovakia (collectively, "Central Europe"), as well as the United Kingdom ("U.K.") and the Republic of Ireland; Molson Coors International ("MCI"), operating in various other countries; and our other non-operating subsidiaries. Effective for the first day of our 2013 fiscal year, we combined our U.K. and Ireland business with our Central Europe operations, which resulted in our Europe segment, and we have recast the historical presentation of segment information accordingly. Unless otherwise indicated, information in this report is presented in U.S. dollars ("USD" or "$"). The accompanying unaudited condensed consolidated interim financial statements reflect all adjustments which are necessary for a fair statement of the financial position, results of operations and cash flows for the periods presented in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP"). Such unaudited interim financial statements have been prepared in accordance with the instructions to Form 10-Q pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. These unaudited condensed consolidated interim financial statements should be read in conjunction with our Annual Report and have been prepared on a consistent basis with the accounting policies described in Note 1 of the Notes to the Audited Consolidated Financial Statements ("Notes") included in our Annual Report on Form 10-K for the year ended December 29, 2012 ("Annual Report"). Our accounting polices did not change in the first quarter of 2013. The results of operations for the 13 weeks ended March 30, 2013, are not necessarily indicative of the results that may be achieved for the full fiscal year. We follow a 52/53 week fiscal reporting calendar. Unless otherwise indicated, the first quarter of 2013 and 2012 refer to the 13 weeks ended March 30, 2013, and March 31, 2012, respectively. Fiscal year 2013 refers to the 52 weeks ending December 28, 2013, and fiscal year 2012 refers to the 52 weeks ended December 29, 2012. MillerCoors and Central Europe follow a monthly reporting calendar. The first quarter of 2013 and 2012 refer to the three months ended March 31, 2013, and March 31, 2012, respectively, except for Central Europe which is excluded from our first quarter 2012 actual results as the acquisition of this business occurred in the second quarter of 2012.

Basis of Presentation and Summary of Significant Accounting Policies

Unless otherwise noted in this report, any description of "we", "us" or "our" includes Molson Coors Brewing Company ("MCBC" or the "Company"), principally a holding company, and its subsidiaries. Our subsidiaries include: Molson Coors Canada, operating in Canada; MillerCoors LLC ("MillerCoors"), which is accounted for by us under the equity method of accounting, operating in the United States ("U.S."); Molson Coors Europe, operating in Czech Republic, Serbia, Croatia, Romania, Bulgaria, Hungary, Montenegro, Bosnia-Herzegovina and Slovakia (collectively, "Central Europe"), as well as the United Kingdom ("U.K.") and the Republic of Ireland; Molson Coors International ("MCI"), operating in various other countries; and our other non-operating subsidiaries. Effective for the first day of our 2013 fiscal year, we combined our U.K. and Ireland business with our Central Europe operations, which resulted in our Europe segment, and we have recast the historical presentation of segment information accordingly.

Unless otherwise indicated, information in this report is presented in U.S. dollars ("USD" or "$").

The accompanying unaudited condensed consolidated interim financial statements reflect all adjustments which are necessary for a fair statement of the financial position, results of operations and cash flows for the periods presented in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP"). Such unaudited interim financial statements have been prepared in accordance with the instructions to Form 10-Q pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations.

These unaudited condensed consolidated interim financial statements should be read in conjunction with our Annual Report and have been prepared on a consistent basis with the accounting policies described in Note 1 of the Notes to the Audited Consolidated Financial Statements ("Notes") included in our Annual Report on Form 10-K for the year ended December 29, 2012 ("Annual Report"). Our accounting polices did not change in the first quarter of 2013. The results of operations for the 13 weeks ended March 30, 2013, are not necessarily indicative of the results that may be achieved for the full fiscal year.

We follow a 52/53 week fiscal reporting calendar. Unless otherwise indicated, the first quarter of 2013 and 2012 refer to the 13 weeks ended March 30, 2013, and March 31, 2012, respectively. Fiscal year 2013 refers to the 52 weeks ending December 28, 2013, and fiscal year 2012 refers to the 52 weeks ended December 29, 2012.

MillerCoors and Central Europe follow a monthly reporting calendar. The first quarter of 2013 and 2012 refer to the three months ended March 31, 2013, and March 31, 2012, respectively, except for Central Europe which is excluded from our first quarter 2012 actual results as the acquisition of this business occurred in the second quarter of 2012.