Investments Transactions with MillerCoors (Details) - MillerCoors - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule of Equity Method Investments [Line Items]
Sales of beer to MillerCoors	$ 2.6	$ 3.2	$ 4.6	$ 6.0
Purchases of beer from MillerCoors	12.2	10.2	22.1	19.3
Service agreement and other charges to MillerCoors	0.6	0.7	1.3	1.3
Service agreement costs from MillerCoors	$ 0.1	$ 0.2	$ 0.2	$ 0.6