Special items Summary Special Items (Details) In Millions, unless otherwise specified	3 Months Ended						12 Months Ended		3 Months Ended																1 Months Ended	12 Months Ended		0 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2015 Canada [Member] Restructuring [Member] USD ($)	Mar. 31, 2014 Canada [Member] Restructuring [Member] USD ($)	Mar. 31, 2015 Europe [Member] Restructuring [Member] USD ($)	Mar. 31, 2014 Europe [Member] Restructuring [Member] USD ($)	Dec. 31, 2014 Europe [Member] Brand Impairment [Member] USD ($)	Dec. 31, 2013 Europe [Member] Brand Impairment [Member] USD ($)	Mar. 31, 2015 Europe [Member] Flood loss [Member] USD ($)		Mar. 31, 2014 Europe [Member] Flood loss [Member] USD ($)		Mar. 31, 2015 Modelo [Member] USD ($)		Mar. 31, 2014 Modelo [Member] USD ($)		Mar. 31, 2015 Licensing Agreements [Member] Canada [Member] USD ($)		Mar. 31, 2014 Licensing Agreements [Member] Canada [Member] USD ($)		Mar. 31, 2015 Licensing Agreements [Member] Europe [Member] USD ($)		Mar. 31, 2014 Licensing Agreements [Member] Europe [Member] USD ($)		Dec. 31, 2013 Heineken [Member] GBP (£)	Dec. 31, 2014 Heineken [Member] USD ($)	Dec. 31, 2014 Heineken [Member] GBP (£)	Apr. 30, 2015 Heineken [Member] Subsequent Event [Member] USD ($)	Apr. 30, 2015 Heineken [Member] Subsequent Event [Member] GBP (£)
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions	$ 8.6	$ (52.5)	$ 0	$ 5.3	$ (1.2)	$ 0.5	$ 360.0	$ 150.9	$ (2.0)	[1]	$ 0	[1]
Termination fee income													0	[2]	(63.2)	[2]
Intangible asset write-off	7.8	15.5															0	[2]	4.9	[2]	11.8	[3]	0	[3]
Early termination payment																									13.0	8.5	5.0	12.0	8.0
Restructuring, Settlement and Impairment Provisions - Gain									$ (2.0)

[1] During the three months ended March 31, 2015, we recorded $2.0 million of income for insurance proceeds received related to significant flooding in Czech Republic that occurred during the second quarter of 2013.

[2] Upon termination of our MMI operations in the first quarter of 2014, we recognized termination fee income and charges associated with the write-off of the definite-lived intangible asset associated with the joint venture. See Note 4, "Investments" for further discussion.

[3] In December 2013, we entered into an agreement with Heineken to early terminate our contract brewing and kegging agreement under which we produced and packaged the Foster's and Kronenbourg brands in the U.K. As a result of the termination, Heineken agreed to pay us an aggregate early termination payment of GBP 13.0 million, of which we received GBP 5.0 million ($8.5 million at payment date) in 2014 and the remaining GBP 8.0 million (approximately $12 million at payment date) on April 30, 2015. The full amount of the termination payment will be recognized as income within special items at the end of the transition period in the second quarter of 2015. Additionally, the termination of this distribution agreement led to a strategic review of our European supply chain network. As part of this analysis, we decided to close the Alton brewery in the U.K., which we anticipate to be completed during the second quarter of 2015. As a result of this anticipated closure, we incurred accelerated depreciation expense in excess of our normal depreciation associated with this brewery. We may incur additional charges associated with the closure of this brewery in 2015, which will also be recorded within special items.