Supplemental Guarantor Information Recast Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 26, 2011	Dec. 25, 2010
Cash and cash equivalents	$ 836.3	$ 1,078.9	$ 1,081.7	$ 1,217.6
Accounts receivable, net	512.4	588.8
Other Receivables	133.7	137.2
Inventory, Net	256.4	207.2
Other assets, net	108.7	94.0
Deferred tax assets	26.4	11.6
Discontinued operations	0.3	0.3
Assets, Current	1,874.2	2,118.0
Properties, net	1,455.3	1,430.1
Goodwill	1,491.5	1,453.3
Other intangibles, net	4,682.8	4,586.0
Investment in MillerCoors	2,613.1	2,487.9
Deferred tax assets	128.5	149.9
Assets	12,436.2	12,423.8
Accounts payable	205.6	301.2
Derivative hedging instruments	11.4	107.6
Deferred tax liabilities	169.1	161.3
Debt, Current	48.2	46.9
Discontinued operations	13.7	13.4
Total current liabilities	1,060.0	1,277.2
Long-term debt	1,950.4	1,914.9
Derivative hedging instruments	222.6	212.5
Pension and post-retirement benefits	708.1	697.5
Deferred tax liabilities	474.9	455.6
Discontinued operations	22.4	22.0
Liabilities	4,588.3	4,733.6
Total Molson Coors Brewing Company stockholders' equity	7,807.3	7,647.9
Noncontrolling interests	40.6	42.3
Total equity	7,847.9	7,690.2
Total liabilities and equity	12,436.2	12,423.8
Recast [Member]
Deferred tax liabilities		(34.7)
Parent Company [Member]
Cash and cash equivalents	680.6	601.1	792.3	832.0
Accounts receivable, net	1.9	0.9
Other Receivables	65.4	46.9
Other assets, net	10.8	9.7
Assets, Current	758.7	658.6
Properties, net	26.4	27.6
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	8,163.6	7,925.2
Deferred tax assets	28.8	33.1
Other assets, net	20.9	19.8
Assets	8,998.4	8,664.3
Accounts payable	8.1	7.3
Accrued expenses and other liabilities, net	35.7	34.6
Deferred tax liabilities	6.5	6.2
Accounts Payable, Related Parties, Current	584.5	413.8
Total current liabilities	634.8	461.9
Long-term debt	550.6	546.2
Pension and post-retirement benefits	0
Other liabilities, net	5.7	8.3
Liabilities	1,191.1	1,016.4
Total Molson Coors Brewing Company stockholders' equity	8,021.5	8,267.8
Notes Receivable, Related Parties, Noncurrent	(214.2)	619.9
Total stockholders' equity	7,807.3	7,647.9
Total equity	7,807.3	7,647.9
Total liabilities and equity	8,998.4	8,664.3
Parent Company [Member] | Recast [Member]
Cash and cash equivalents	680.6	601.1	792.3	832.0
Accounts receivable, net	1.9	0.9
Other Receivables	65.4	46.9
Other assets, net	10.8	9.7
Assets, Current	758.7	658.6
Properties, net	26.4	27.6
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	8,163.6	7,925.2
Deferred tax assets	28.8	33.1
Other assets, net	20.9	19.8
Assets	8,998.4	8,664.3
Accounts payable	8.1	7.3
Accrued expenses and other liabilities, net	35.7	34.6
Deferred tax liabilities	6.5	6.2
Accounts Payable, Related Parties, Current	584.5	413.8
Total current liabilities	634.8	461.9
Long-term debt	550.6	546.2
Pension and post-retirement benefits	0
Other liabilities, net	5.7	8.3
Liabilities	1,191.1	1,016.4
Total Molson Coors Brewing Company stockholders' equity	8,021.5	8,267.8
Notes Receivable, Related Parties, Noncurrent	(214.2)	619.9
Total stockholders' equity	7,807.3	7,647.9
Total equity	7,807.3	7,647.9
Total liabilities and equity	8,998.4	8,664.3
Issuer 2002 [Member]
Cash and cash equivalents	0	0	0	7.0
Accounts receivable, net	6.6	6.7
Other assets, net	4.0	4.0
Deferred tax assets	11.4	5.8
Intercompany accounts receivable	166.4	49.1
Assets, Current	188.4	65.6
Properties, net	7.0	7.2
Goodwill	11.4	11.4
Other intangibles, net	37.2	37.2
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	5,586.9	5,686.2
Deferred tax assets	103.7	119.1
Other assets, net	13.8	14.7
Assets	5,948.4	5,941.4
Accounts payable	2.3	3.2
Accrued expenses and other liabilities, net	5.5	4.7
Derivative hedging instruments	2.2	101.4
Deferred tax liabilities		0
Debt, Current	44.6	44.7
Accounts Payable, Related Parties, Current	9.0	26.1
Total current liabilities	63.6	180.1
Derivative hedging instruments	220.9	210.7
Pension and post-retirement benefits	2.8	2.7
Other liabilities, net	14.7	14.5
Notes Payable, Related Parties, Noncurrent	(212.3)	618.0
Liabilities	514.3	1,026.0
Total Molson Coors Brewing Company stockholders' equity	5,476.3	4,954.7
Notes Receivable, Related Parties, Noncurrent	42.2	39.3
Total stockholders' equity	5,434.1	4,915.4
Total equity	5,434.1	4,915.4
Total liabilities and equity	5,948.4	5,941.4
Issuer 2002 [Member] | Recast [Member]
Cash and cash equivalents	0	0	0	7.0
Accounts receivable, net	6.6	6.7
Other assets, net	4.0	4.0
Deferred tax assets	11.4	5.8
Intercompany accounts receivable	166.4	49.1
Assets, Current	188.4	65.6
Properties, net	7.0	7.2
Goodwill	11.4	11.4
Other intangibles, net	37.2	37.2
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	5,586.9	5,686.2
Deferred tax assets	103.7	119.1
Other assets, net	13.8	14.7
Assets	5,948.4	5,941.4
Accounts payable	2.3	3.2
Accrued expenses and other liabilities, net	5.5	4.7
Derivative hedging instruments	2.2	101.4
Deferred tax liabilities		0
Debt, Current	44.6	44.7
Accounts Payable, Related Parties, Current	9.0	26.1
Total current liabilities	63.6	180.1
Derivative hedging instruments	220.9	210.7
Pension and post-retirement benefits	2.8	2.7
Other liabilities, net	14.7	14.5
Notes Payable, Related Parties, Noncurrent	(212.3)	618.0
Liabilities	514.3	1,026.0
Total Molson Coors Brewing Company stockholders' equity	5,476.3	4,954.7
Notes Receivable, Related Parties, Noncurrent	42.2	39.3
Total stockholders' equity	5,434.1	4,915.4
Total equity	5,434.1	4,915.4
Total liabilities and equity	5,948.4	5,941.4
Subsidiary Guarantors
Cash and cash equivalents	64.3	318.0	167.8	190.1
Accounts receivable, net	172.6	203.6
Other Receivables	23.5	29.1
Inventory, Net	101.7	83.0
Other assets, net	62.4	44.7
Intercompany accounts receivable	1,017.2	1,449.6
Assets, Current	1,441.7	2,128.0
Properties, net	877.3	862.9
Goodwill	312.3	305.4
Other intangibles, net	4,237.5	4,150.8
Investment in MillerCoors	2,613.1	2,487.9
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	377.3	611.5
Deferred tax assets	11.0	12.7
Other assets, net	94.2	92.9
Assets	9,964.4	10,652.1
Accounts payable	73.2	100.6
Accrued expenses and other liabilities, net	237.3	270.4
Derivative hedging instruments	8.0	4.7
Deferred tax liabilities	168.9	161.4
Accounts Payable, Related Parties, Current	868.7	1,566.5
Total current liabilities	1,356.1	2,103.6
Long-term debt	1,399.8	1,368.7
Derivative hedging instruments	1.4	1.5
Pension and post-retirement benefits	399.7	392.5
Other liabilities, net	32.8	35.3
Liabilities	3,189.8	3,901.6
Total Molson Coors Brewing Company stockholders' equity	11,677.7	11,675.6
Notes Receivable, Related Parties, Noncurrent	4,903.1	4,925.1
Total stockholders' equity	6,774.6	6,750.5
Total equity	6,774.6	6,750.5
Total liabilities and equity	9,964.4	10,652.1
Subsidiary Guarantors | Recast [Member]
Cash and cash equivalents	118.9	422.5	255.6	342.5
Accounts receivable, net	473.9	544.1
Other Receivables	67.7	84.0
Inventory, Net	240.2	193.0
Other assets, net	80.9	70.2
Intercompany accounts receivable	1,054.5	1,470.9
Assets, Current	2,036.1	2,784.7
Properties, net	1,330.5	1,306.8
Goodwill	1,049.9	1,021.6
Other intangibles, net	4,584.0	4,488.1
Investment in MillerCoors	2,613.1	2,487.9
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	775.9	1,071.9
Deferred tax assets	28.4	30.1
Other assets, net	142.1	140.9
Assets	12,560.0	13,332.0
Accounts payable	169.4	252.9
Accrued expenses and other liabilities, net	529.1	575.2
Derivative hedging instruments	9.2	6.2
Deferred tax liabilities	168.9	161.4
Accounts Payable, Related Parties, Current	941.1	1,618.5
Total current liabilities	1,817.7	2,614.2
Long-term debt	1,399.8	1,368.7
Derivative hedging instruments	1.7	1.8
Pension and post-retirement benefits	701.9	690.9
Other liabilities, net	35.1	38.5
Notes Payable, Related Parties, Noncurrent	(912.5)	886.0
Liabilities	4,868.7	5,600.1
Total Molson Coors Brewing Company stockholders' equity	12,601.7	12,664.1
Notes Receivable, Related Parties, Noncurrent	4,910.4	4,932.2
Total stockholders' equity	7,691.3	7,731.9
Total equity	7,691.3	7,731.9
Total liabilities and equity	12,560.0	13,332.0
Subsidiary Non-Guarantors
Cash and cash equivalents	91.4	159.8	121.6	188.5
Accounts receivable, net	331.3	377.6
Other Receivables	45.4	61.2
Inventory, Net	154.7	124.2
Other assets, net	31.5	35.6
Deferred tax assets	21.3	12.1
Discontinued operations	0.3	0.3
Intercompany accounts receivable	857.9	1,537.3
Assets, Current	1,533.8	2,308.1
Properties, net	544.6	532.4
Goodwill	1,167.8	1,136.5
Other intangibles, net	408.1	398.0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	4,927.4	4,774.0
Deferred tax assets	0	1.9
Other assets, net	61.9	71.2
Assets	8,643.6	9,222.1
Accounts payable	122.6	190.1
Accrued expenses and other liabilities, net	333.5	337.1
Derivative hedging instruments	1.2	1.5
Debt, Current	3.6	2.2
Discontinued operations	13.7	13.4
Accounts Payable, Related Parties, Current	579.3	1,029.6
Total current liabilities	1,053.9	1,573.9
Derivative hedging instruments	0.3	0.3
Pension and post-retirement benefits	305.6	302.3
Deferred tax liabilities	489.9	472.5
Other liabilities, net	96.7	95.8
Discontinued operations	22.4	22.0
Notes Payable, Related Parties, Noncurrent	(4,947.2)	4,966.3
Liabilities	6,916.0	7,433.1
Total Molson Coors Brewing Company stockholders' equity	1,687.0	1,746.7
Total stockholders' equity	1,687.0	1,746.7
Noncontrolling interests	40.6	42.3
Total equity	1,727.6	1,789.0
Total liabilities and equity	8,643.6	9,222.1
Subsidiary Non-Guarantors | Recast [Member]
Cash and cash equivalents	36.8	55.3	33.8	36.1
Accounts receivable, net	30.0	37.1
Other Receivables	1.2	6.3
Inventory, Net	16.2	14.2
Other assets, net	13.0	10.1
Deferred tax assets	21.3	12.1
Discontinued operations	0.3	0.3
Intercompany accounts receivable	937.4	1,612.9
Assets, Current	1,056.2	1,748.3
Properties, net	91.4	88.5
Goodwill	430.2	420.3
Other intangibles, net	61.6	60.7
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	5,522.0	5,363.3
Deferred tax assets	0	2.3
Other assets, net	14.0	23.2
Assets	7,175.4	7,706.6
Accounts payable	26.4	37.8
Accrued expenses and other liabilities, net	41.7	32.3
Derivative hedging instruments	0	0
Debt, Current	3.6	2.2
Discontinued operations	13.7	13.4
Accounts Payable, Related Parties, Current	623.7	1,074.5
Total current liabilities	709.1	1,160.2
Derivative hedging instruments	0	0
Pension and post-retirement benefits	3.4	3.9
Deferred tax liabilities	507.3	490.3
Other liabilities, net	94.4	92.6
Discontinued operations	22.4	22.0
Notes Payable, Related Parties, Noncurrent	(4,954.5)	4,971.6
Liabilities	6,291.1	6,740.6
Total Molson Coors Brewing Company stockholders' equity	1,756.2	1,807.9
Notes Receivable, Related Parties, Noncurrent	912.5	884.2
Total stockholders' equity	843.7	923.7
Noncontrolling interests	40.6	42.3
Total equity	884.3	966.0
Total liabilities and equity	7,175.4	7,706.6
Eliminations
Cash and cash equivalents	0		0
Other Receivables	(0.6)
Deferred tax assets	(6.3)	(6.3)
Intercompany accounts receivable	(2,041.5)	(3,036.0)
Assets, Current	(2,048.4)	(3,042.3)
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(19,055.2)	(18,996.9)
Deferred tax assets	(15.0)	(16.9)
Assets	(21,118.6)	(22,056.1)
Accounts payable	(0.6)
Deferred tax liabilities	(6.3)	(6.3)
Accounts Payable, Related Parties, Current	(2,041.5)	(3,036.0)
Total current liabilities	(2,048.4)	(3,042.3)
Pension and post-retirement benefits	0
Deferred tax liabilities	(15.0)	(16.9)
Notes Payable, Related Parties, Noncurrent	5,159.5	(5,584.3)
Liabilities	(7,222.9)	(8,643.5)
Total Molson Coors Brewing Company stockholders' equity	(19,055.2)	(18,996.9)
Notes Receivable, Related Parties, Noncurrent	(5,159.5)	(5,584.3)
Total stockholders' equity	(13,895.7)	(13,412.6)
Total equity	(13,895.7)	(13,412.6)
Total liabilities and equity	(21,118.6)	(22,056.1)
Eliminations | Recast [Member]
Cash and cash equivalents	0		0
Other Receivables	(0.6)
Deferred tax assets	(6.3)	(6.3)
Intercompany accounts receivable	(2,158.3)	(3,132.9)
Assets, Current	(2,165.2)	(3,139.2)
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(20,048.4)	(20,046.6)
Deferred tax assets	(32.4)	(34.7)
Assets	(22,246.0)	(23,220.5)
Accounts payable	(0.6)
Deferred tax liabilities	(6.3)	(6.3)
Accounts Payable, Related Parties, Current	(2,158.3)	(3,132.9)
Total current liabilities	(2,165.2)	(3,139.2)
Pension and post-retirement benefits	0
Deferred tax liabilities	(32.4)
Notes Payable, Related Parties, Noncurrent	6,079.3	(6,475.6)
Liabilities	(8,276.9)	(9,649.5)
Total Molson Coors Brewing Company stockholders' equity	(20,048.4)	(20,046.6)
Notes Receivable, Related Parties, Noncurrent	(6,079.3)	(6,475.6)
Total stockholders' equity	(13,969.1)	(13,571.0)
Total equity	(13,969.1)	(13,571.0)
Total liabilities and equity	(22,246.0)	(23,220.5)
Consolidated [Member]
Cash and cash equivalents	836.3	1,078.9	1,081.7	1,217.6
Accounts receivable, net	512.4	588.8
Other Receivables	133.7	137.2
Inventory, Net	256.4	207.2
Other assets, net	108.7	94.0
Deferred tax assets	26.4	11.6
Discontinued operations	0.3	0.3
Assets, Current	1,874.2	2,118.0
Properties, net	1,455.3	1,430.1
Goodwill	1,491.5	1,453.3
Other intangibles, net	4,682.8	4,586.0
Investment in MillerCoors	2,613.1	2,487.9
Deferred tax assets	128.5	149.9
Other assets, net	190.8	198.6
Assets	12,436.2	12,423.8
Accounts payable	205.6	301.2
Accrued expenses and other liabilities, net	612.0	646.8
Derivative hedging instruments	11.4	107.6
Deferred tax liabilities	169.1	161.3
Debt, Current	48.2	46.9
Discontinued operations	13.7	13.4
Total current liabilities	1,060.0	1,277.2
Long-term debt	1,950.4	1,914.9
Derivative hedging instruments	222.6	212.5
Pension and post-retirement benefits	708.1	697.5
Deferred tax liabilities	474.9	455.6
Other liabilities, net	149.9	153.9
Discontinued operations	22.4	22.0
Liabilities	4,588.3	4,733.6
Total Molson Coors Brewing Company stockholders' equity	7,807.3	7,647.9
Total stockholders' equity	7,807.3	7,647.9
Noncontrolling interests	40.6	42.3
Total equity	7,847.9	7,690.2
Total liabilities and equity	12,436.2	12,423.8
Consolidated [Member] | Recast [Member]
Cash and cash equivalents	836.3	1,078.9	1,081.7	1,217.6
Accounts receivable, net	512.4	588.8
Other Receivables	133.7	137.2
Inventory, Net	256.4	207.2
Other assets, net	108.7	94.0
Deferred tax assets	26.4	11.6
Discontinued operations	0.3	0.3
Assets, Current	1,874.2	2,118.0
Properties, net	1,455.3	1,430.1
Goodwill	1,491.5	1,453.3
Other intangibles, net	4,682.8	4,586.0
Investment in MillerCoors	2,613.1	2,487.9
Deferred tax assets	128.5	149.9
Other assets, net	190.8	198.6
Assets	12,436.2	12,423.8
Accounts payable	205.6	301.2
Accrued expenses and other liabilities, net	612.0	646.8
Derivative hedging instruments	11.4	107.6
Deferred tax liabilities	169.1	161.3
Debt, Current	48.2	46.9
Discontinued operations	13.7	13.4
Total current liabilities	1,060.0	1,277.2
Long-term debt	1,950.4	1,914.9
Derivative hedging instruments	222.6	212.5
Pension and post-retirement benefits	708.1	697.5
Deferred tax liabilities	474.9	455.6
Other liabilities, net	149.9	153.9
Discontinued operations	22.4	22.0
Liabilities	4,588.3	4,733.6
Total Molson Coors Brewing Company stockholders' equity	7,807.3	7,647.9
Total stockholders' equity	7,807.3	7,647.9
Noncontrolling interests	40.6	42.3
Total equity	7,847.9	7,690.2
Total liabilities and equity	$ 12,436.2	$ 12,423.8