Investments Proportional (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Equity income in MillerCoors	$ 205.5	$ 190.1	$ 334.8	$ 312.9
MillerCoors
Schedule of Equity Method Investments [Line Items]
Net income attributable to MillerCoors	$ 487.2	$ 445.2	$ 791.8	$ 736.4
MCBC economic interest	42.00%	42.00%	42.00%	42.00%	42.00%
MCBC proportionate share of MillerCoors net income	$ 204.6	$ 187.0	$ 332.6	$ 309.3
Amortization of the difference between MCBC contributed cost basis and proportional share of the underlying equity in the net assets of MillerCoors	1.3	1.2	2.4	2.3
Share-based compensation adjustment	(0.4)	1.9	(0.2)	1.3
Equity income in MillerCoors	$ 205.5	$ 190.1	$ 334.8	$ 312.9