Special Items (Details) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended		1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended	12 Months Ended																																								3 Months Ended	12 Months Ended													1 Months Ended		12 Months Ended							12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 29, 2012 USD ($)	Dec. 31, 2013 Heineken GBP (£)	Dec. 31, 2014 Heineken USD ($)	Dec. 31, 2014 Heineken GBP (£)	Dec. 31, 2013 MC Si Hai USD ($)	Sep. 30, 2012 MC Si Hai USD ($)	Jun. 30, 2012 MC Si Hai USD ($)	Dec. 31, 2013 MC Si Hai Deconsolidation liability USD ($)	Sep. 29, 2012 MC Si Hai Deconsolidation liability USD ($)	Dec. 31, 2013 MC Si Hai Proceeds from sale USD ($)	Dec. 31, 2014 Canada Restructuring USD ($)	Dec. 31, 2013 Canada Restructuring USD ($)	Dec. 29, 2012 Canada Restructuring USD ($)	Dec. 31, 2014 Canada Other atypical employee-related costs USD ($)	Dec. 31, 2013 Canada Other atypical employee-related costs USD ($)	Dec. 29, 2012 Canada Other atypical employee-related costs USD ($)	Dec. 31, 2014 Canada Software abandonment USD ($)		Dec. 31, 2013 Canada Software abandonment USD ($)		Dec. 29, 2012 Canada Software abandonment USD ($)		Dec. 31, 2014 Canada Flood insurance loss (reimbursement) USD ($)		Dec. 31, 2013 Canada Flood insurance loss (reimbursement) USD ($)		Dec. 29, 2012 Canada Flood insurance loss (reimbursement) USD ($)		Dec. 31, 2014 Canada BRI loan guarantee adjustment USD ($)		Dec. 31, 2013 Canada BRI loan guarantee adjustment USD ($)		Dec. 29, 2012 Canada BRI loan guarantee adjustment USD ($)		Dec. 31, 2014 Europe USD ($)	Dec. 31, 2014 Europe Restructuring USD ($)	Dec. 31, 2013 Europe Restructuring USD ($)	Dec. 29, 2012 Europe Restructuring USD ($)	Dec. 31, 2014 Europe Brand Impairment USD ($)		Dec. 31, 2013 Europe Brand Impairment USD ($)		Dec. 29, 2012 Europe Brand Impairment USD ($)		Dec. 31, 2014 Europe Asset abandonment USD ($)		Dec. 31, 2013 Europe Asset abandonment USD ($)		Dec. 29, 2012 Europe Asset abandonment USD ($)		Jun. 29, 2013 Europe Flood insurance loss (reimbursement) USD ($)	Dec. 31, 2014 Europe Flood insurance loss (reimbursement) USD ($)		Dec. 31, 2013 Europe Flood insurance loss (reimbursement) USD ($)		Dec. 29, 2012 Europe Flood insurance loss (reimbursement) USD ($)		Dec. 31, 2014 Europe Release of non-income-related tax reserve USD ($)		Dec. 31, 2013 Europe Release of non-income-related tax reserve USD ($)		Dec. 29, 2012 Europe Release of non-income-related tax reserve USD ($)		Dec. 26, 2009 Europe Release of non-income-related tax reserve USD ($)	Dec. 31, 2013 Europe Termination fees and other (gains)/losses USD ($)		Dec. 31, 2014 Europe Termination fees and other (gains)/losses USD ($)		Dec. 31, 2013 Europe Termination fees and other (gains)/losses USD ($)		Dec. 29, 2012 Europe Termination fees and other (gains)/losses USD ($)		Nov. 30, 2013 Europe Termination fees and other (gains)/losses	Dec. 31, 2014 MCI Restructuring USD ($)	Dec. 31, 2013 MCI Restructuring USD ($)	Dec. 29, 2012 MCI Restructuring USD ($)	Dec. 31, 2014 MCI China impairment and related costs USD ($)		Dec. 31, 2013 MCI China impairment and related costs USD ($)		Dec. 29, 2012 MCI China impairment and related costs USD ($)		Dec. 31, 2014 MCI Termination fees and other (gains)/losses USD ($)		Dec. 31, 2013 MCI Termination fees and other (gains)/losses USD ($)		Dec. 29, 2012 MCI Termination fees and other (gains)/losses USD ($)		Dec. 31, 2014 Corporate Restructuring USD ($)	Dec. 31, 2013 Corporate Restructuring USD ($)	Dec. 29, 2012 Corporate Restructuring USD ($)
Restructuring Cost and Reserve [Line Items]
Total special items	$ 324.4	$ 200.0	$ 81.4										$ 7.6	$ 10.6	$ 10.1	$ 0	$ 2.2	$ 5.0	$ 13.8	[1]	$ 17.9	[1]	$ 0	[1]							$ (63.2)	[1]	$ 0	[1]	$ 0	[1]		$ 3.7	$ 14.5	$ 19.8	$ 360.0	[2]	$ 150.9	[2]	$ 0	[2]	$ 4.0	[3]	$ 0	[3]	$ 7.2	[3]	$ 5.4														$ 13.2	[4]	$ 0	[4]	$ 13.2	[4]	$ 0	[4]		$ 0	$ 0.4	$ 3.0	$ 0	[5]	$ 0	[5]	$ 39.2	[5]	$ 0	[5]	$ (4.8)	[5]	$ 0	[5]	$ 0.3	$ 1.3	$ 2.0
Unusual or Infrequent Item, Insurance Proceeds																									0	[6]	0	[6]	(1.4)	[6]																								(3.9)
Unusual or Infrequent Item, Gain, Gross																																																												0	[7]	(4.2)	[7]	(3.5)	[7]
Unusual or Infrequent Item, Net of Insurance Proceeds																																																						(1.8)	[8]	(2.0)	[8]	0	[8]
Proceeds from divestiture of joint venture interest, termination fee				13.0	8.5	5.0
Loss on disposal on joint venture							6.0			5.4	5.4	0.6
Legal and other fees related to disposal of joint venture							1.2
Impairment loss								27.6	10.4
Non-income-related tax reserves																																																																		10.4
Unusual or Infrequent Item, Loss, Gross																																					2.1
Restructuring, Settlement and Impairment Provisions - Gain																																																								$ 7.4
Joint venture, ownership percentage																																																																											49.90%

[1] Upon termination of our MMI operations in 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 5, "Investments" for further discussion.Additionally, in the third quarter of 2014 and fourth quarter of 2013, we recognized impairment charges related to our definite-lived intangible asset associated with our license agreement with Miller in Canada. See Note 12, "Goodwill and Intangible Assets" and Note 19, "Commitments and Contingencies" for further discussion.

[2] During the third quarters of 2014 and 2013, we recognized impairment charges related to indefinite-lived intangible assets in Europe. See Note 12, "Goodwill and Intangible Assets" for further discussion.

[3] In December 2013, we entered into an agreement with Heineken to early terminate our contract brewing and kegging agreement with Heineken 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 $8.5 million (GBP 5.0 million) in 2014 and will receive the remainder at the end of the transition period, concluding 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. Additionally, the termination of this distribution agreement led to a strategic review of our European supply chain network. As part of this analysis, we entered into a consultation process during the fourth quarter of 2014 following a proposal by management to close one of our U.K. brewing facilities in 2015. As a result of management's proposal, we incurred accelerated depreciation expense in excess of our normal depreciation associated with this brewery. We may incur additional charges associated with the proposed closing of this brewery in 2015, which we anticipate will also be recorded within special items.During the second quarter of 2012, we recognized an asset abandonment charge related to the discontinuation of primary packaging in the U.K. We determined that our Home Draft package was not meeting expectations driven by a lack of demand in the U.K. market, and as a result, we recognized a loss related to the write-off of the Home Draft packaging line, tooling equipment and packaging materials inventory.

[4] Upon termination of our Tradeteam distribution agreements and subsequent termination of the joint venture and sale of our 49.9% interest in Tradeteam to DHL, we recognized a loss of $13.2 million in December 2013. See Note 5, "Investments" for further discussion.

[5] In December of 2013, we sold our interest in the MC Si'hai joint venture in China and recognized a gain of $6.0 million. The gain consists of the non-cash release of the $5.4 million liability representing the fair value of our remaining investment upon deconsolidation of the joint venture in 2012, as well as $0.6 million of proceeds received for our interest in the joint venture. We also recognized legal and related fees in relation to the sale of $1.2 million during 2013. In the second quarter of 2012, we recognized impairment charges of $10.4 million related to goodwill and definite-lived intangible assets in our MC Si'hai joint venture in China, and in the third quarter of 2012, we deconsolidated the joint venture and recognized an impairment loss of $27.6 million upon deconsolidation. See Note 5, "Investments" for further discussion of the deconsolidation and subsequent sale of the joint venture.

[6] During 2012, we received insurance proceeds in excess of expenses incurred related to flood damages at our Toronto offices.

[7] During 2009, we established a non-income-related tax reserve of $10.4 million that was recorded as a special item. The amounts recorded in 2013 and 2012 represent the release of this reserve as a result of a change in estimate. As a result, the remaining amount of this non-income-related tax reserve was fully released in 2013.

[8] During 2014, we recorded losses and related costs of $2.1 million in our Europe business associated with significant flooding in Serbia, Bosnia and Croatia that occurred in the second quarter of 2014. These losses were offset by insurance proceeds of $3.9 million received related to the flooding that occurred in the second quarter of 2014. During 2013, we recorded losses and related net costs of $5.4 million in our Europe business related to significant flooding in Czech Republic in the second quarter of 2013. These losses were offset by $7.4 million insurance proceeds received in 2013.