Segment Reporting Income (Loss) From Continuing Operations (Details) £ in Millions, $ in Millions		3 Months Ended					6 Months Ended			12 Months Ended
	Apr. 30, 2015 GBP (£)	Jun. 30, 2015 GBP (£)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)		Jun. 30, 2015 GBP (£)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 GBP (£)
Segment Reporting
Income (loss) from continuing operations before income taxes			$ 290.0	$ 329.3				$ 383.5	$ 498.9
Amortization of Intangible Assets			(5.9)	(10.4)				(13.7)	(21.0)
Gain Related to Release of Indirect-Tax Reserve, including interest					$ 13.0
Heineken [Member]
Segment Reporting
Proceeds from early contract termination | £	£ 8.0	£ 13.0								£ 5.0
Modelo [Member]
Segment Reporting
Termination fee income			0.0	0.0	$ 63.2	[1]		0.0	63.2
Canada [Member]
Segment Reporting
Income (loss) from continuing operations before income taxes			106.1	120.8				137.0	209.1
Write-off charge related to abandonment			(8.2)
Canada [Member] | Licensing Agreements [Member]
Segment Reporting
Amortization of Intangible Assets			0.0	0.0				0.0	(4.9)
U.S. [Member]
Segment Reporting
Income (loss) from continuing operations before income taxes			205.5	190.1				334.8	312.9
Europe [Member]
Segment Reporting
Income (loss) from continuing operations before income taxes			49.0	84.5				44.9	111.5
Termination fee income			(10.0)	0.0				(10.0)	0.0
Termination fee expense			(29.4)				£ (19.0)	(29.4)
Write-off charge related to abandonment			(1.3)
Gain Related to Release of Indirect-Tax Reserve, including interest									13.0
Europe [Member] | Heineken [Member]
Segment Reporting
Termination fee income			19.4					19.4
MCI [Member]
Segment Reporting
Income (loss) from continuing operations before income taxes			(12.2)	(3.7)				(17.6)	(6.7)
Charges for plan to restructure operations			(6.4)					(6.4)
Corporate [Member]
Segment Reporting
Income (loss) from continuing operations before income taxes			$ (58.4)	$ (62.4)				$ (115.6)	$ (127.9)

[1] During the second quarter of 2015, we announced our decision to substantially restructure our business in China and consequently, recognized employee-related and asset write-off charges.