Investments Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended
	Oct. 31, 2015	Jun. 30, 2015 CAD	Sep. 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
Revolving credit facility, maximum borrowing capacity					$ 750.0
MillerCoors
Schedule of Equity Method Investments [Line Items]
Equity Method Investments, Intercompany Transactions, Net Payables Due			$ (5.6)	$ (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	45.90%	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
Other Current Liabilities [Member] | Brewers' Retail Inc. (BRI) [Member]
Schedule of Equity Method Investments [Line Items]
Guarantees, Fair Value Disclosure			$ 12.4