Investments Transactions with MillerCoors (Details) - MillerCoors - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Equity Method Investments [Line Items]
Sales of beer to MillerCoors	$ 3.2	$ 3.7	$ 6.0	$ 6.3
Purchases of beer from MillerCoors	10.2	9.1	19.3	16.2
Service agreement and other charges to MillerCoors	0.7	0.7	1.3	1.1
Service agreement costs from MillerCoors	$ 0.2	$ 0.3	$ 0.6	$ 0.5