Investments Narrative (Details) $ in Millions	3 Months Ended
	Jun. 30, 2015 CAD VIE	Jun. 30, 2015 USD ($) VIE	Dec. 31, 2014 USD ($) VIE	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Variable Interest Entities with Debt | VIE	0	0	0
Revolving credit facility, maximum borrowing capacity				$ 750.0
MillerCoors
Schedule of Equity Method Investments [Line Items]
Equity Method Investments, Intercompany Transactions, Net Payables Due		$ (8.1)	$ (8.3)
Canada [Member] | Licensing Agreements [Member]
Schedule of Equity Method Investments [Line Items]
Finite-Lived Intangible Assets, Net					$ 4.9
Brewers' Retail Inc. (BRI) [Member]
Schedule of Equity Method Investments [Line Items]
Guarantee obligation, percentage	50.00%
Brewers' Retail Inc. (BRI) [Member] | Revolving credit facility [Member] | Canadian Imperial Bank of Commerce (CIBC) [Member]
Schedule of Equity Method Investments [Line Items]
Revolving credit facility, maximum borrowing capacity | CAD	CAD 150,000,000
Revolving credit facility, term	1 year
Revolving credit facility, renewal option, term	1 year