Goodwill (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Aug. 31, 2015	Feb. 28, 2015
Changes in the carrying amount of goodwill
Goodwill, beginning of period	$ 6,208.2	$ 6,146.8
Purchase accounting allocations	239.8	100.7
Foreign currency translation adjustments	(31.2)	(39.3)
Goodwill, end of period	6,416.8	6,208.2
Operating Segments [Member] | Beer [Member]
Changes in the carrying amount of goodwill
Goodwill, beginning of period	3,776.2	3,714.6
Purchase accounting allocations	0.0	66.7
Foreign currency translation adjustments	(4.9)	(5.1)
Goodwill, end of period	3,771.3	3,776.2
Operating Segments [Member] | Wine and Spirits [Member]
Changes in the carrying amount of goodwill
Goodwill, beginning of period	2,432.0	2,432.2
Purchase accounting allocations	239.8	34.0
Foreign currency translation adjustments	(26.3)	(34.2)
Goodwill, end of period	$ 2,645.5	$ 2,432.0