Earnings per Share ("EPS") Basic and Diluted (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 30, 2013
Amounts attributable to MCBC
Net income (loss) from continuing operations	$ 165.3	$ 29.4	[1]
Income (loss) from discontinued operations, net of tax	(1.9)	(0.9)	[1]
Net income (loss) attributable to Molson Coors Brewing Company	$ 163.4	$ 28.5	[1]
Weighted average shares for basic EPS (in shares)	184.3	181.7
Effect of dilutive securities:
Weighted average shares for diluted EPS (in shares)	185.5	182.9
Basic net income (loss) per share:
Continuing operations attributable to MCBC (in dollars per share)	$ 0.90	$ 0.16	[1]
Discontinued operations attributable to MCBC (in dollars per share)	$ (0.01)	$ 0.00	[1]
Net income attributable to MCBC (in dollars per share)	$ 0.89	$ 0.16	[1]
Diluted net income (loss) per share:
Continuing operations attributable to MCBC (in dollars per share)	$ 0.89	$ 0.16	[1]
Discontinued operations attributable to MCBC (in dollars per share)	$ (0.01)	$ 0.00	[1]
Net income attributable to MCBC (in dollars per share)	$ 0.88	$ 0.16	[1]
Dividends declared per share (in dollars per share)	$ 0.37	$ 0.32
Options and Sosars [Member]
Effect of dilutive securities:
Effect of dilutive securities of Options, SOSAR's, RSU's, PU's, and DSU's	0.6	0.7
RSU PSU PU DSU [Member]
Effect of dilutive securities:
Effect of dilutive securities of Options, SOSAR's, RSU's, PU's, and DSU's	0.6	0.5

[1] Amounts have been adjusted to reflect the change in interim accounting for advertising expenses. See Note 1, "Basis of Presentation and Summary of Significant Accounting Policies" for further discussion.