Investments Other Equity Method Investments (Details) CAD in Millions, $ in Millions		3 Months Ended				9 Months Ended
	Nov. 05, 2013 CAD	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)		Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Amortization of Intangible Assets		$ 6.4	$ 10.1			$ 20.1	$ 31.1
Income (Loss) from Equity Method Investments						2.6	3.0
Modelo Molson Imports L P MMI [Member]
Schedule of Equity Method Investments [Line Items]
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions			50.00%
Gain on early termination of joint venture | CAD	CAD 70.0
Income (Loss) from Equity Method Investments							0.7
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party							1.1
Modelo [Member]
Schedule of Equity Method Investments [Line Items]
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions			50.00%
Termination fee income		0.0	$ 0.0	$ 63.2	[1]	0.0	63.2
Canada [Member] | Licensing Agreements [Member]
Schedule of Equity Method Investments [Line Items]
Amortization of Intangible Assets		$ 0.0	8.9			$ 0.0	$ 13.8
Impairment of Intangible Assets, Finite-lived			$ 8.9
Finite-Lived Intangible Assets, Net				$ 4.9

[1] During the second quarter of 2015, we announced our decision to substantially restructure our business in China and consequently, recognized employee-related and asset write-off charges, including $0.7 million of accelerated depreciation.