OPEB Recognized Net (Gain) Loss Due to Curtailments

No definition available.

Name:	tap_OPEBRecognizedNetGainLossDuetoCurtailments
Namespace Prefix:	tap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage Of Fair Value Exceeding Carrying Value

+ References

No definition available.

+ Details

Name:	tap_PercentageOfFairValueExceedingCarryingValue
Namespace Prefix:	tap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Proceeds From Collection of Termination Fees

+ References

No definition available.

+ Details

Name:	tap_ProceedsFromCollectionofTerminationFees
Namespace Prefix:	tap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	us-gaap_AccountsAndOtherReceivablesNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainLossOnContractTermination
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The loss recognized on termination of a contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 275
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68065670&loc=d3e54681-109401

+ Details

Name:	us-gaap_LossOnContractTermination
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

+ Details

Name:	us-gaap_PensionExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of positions eliminated during the period as a result of restructuring activities.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringReserveAcceleratedDepreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of restructuring charges, remediation cost, and asset impairment loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_RestructuringSettlementAndImpairmentProvisions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of gain recognized in the income statement for an event or transaction that is unusual in nature or infrequent in occurrence, or both.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64828382&loc=d3e15138-107781

+ Details

Name:	us-gaap_UnusualOrInfrequentItemGainGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_UnusualOrInfrequentItemLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=tap_OtherEmployeeRelatedCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=tap_SaleofAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=tap_AssetAbandonmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_EuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=tap_TerminationFeesandOtherGainsLossesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=tap_MciMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=tap_HeinekenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=tap_MontrealBreweryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=tap_EstimatedfuturechargesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=tap_PlovdivBreweryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=tap_CashproceedsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=us-gaap_EuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=country_CN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_FacilityClosingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Special Items Special Items Recorded By Segment (Narrative) (Details) £ in Millions, CAD in Millions, $ in Millions	1 Months Ended	3 Months Ended			12 Months Ended					24 Months Ended
	Dec. 31, 2013 GBP (£)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CAD	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) employee	Dec. 31, 2015 GBP (£) employee	Dec. 31, 2014 GBP (£) employee	Dec. 31, 2015 employee	Mar. 31, 2016 USD ($)	Mar. 31, 2016 CAD
Unusual or Infrequent Item [Line Items]
Accelerated depreciation					$ 20.5	$ 12.4	$ 49.4
Special items, net					28.1	(2,522.4)	346.7
Accounts and Other Receivables, Net, Current											$ 140.8	CAD 183.1
Other Employee-Related Costs [Member]
Unusual or Infrequent Item [Line Items]
Pension Expense					(8.3)	10.5	0.0
Special items, net					$ 2.6	7.3	8.3
Canada
Unusual or Infrequent Item [Line Items]
Percentage Of Fair Value Exceeding Carrying Value		26.00%			26.00%
Canada \| Other Employee-Related Costs [Member]
Unusual or Infrequent Item [Line Items]
OPEB Recognized Net (Gain) Loss Due to Curtailments				$ (2.9)
Canada \| Sale of Asset [Member]
Unusual or Infrequent Item [Line Items]
Unusual or Infrequent Item, Gain, Gross					$ 0.0	(110.4)	0.0
Canada \| Asset Abandonment [Member]
Unusual or Infrequent Item [Line Items]
Special items, net					$ 14.4	5.0	25.1
Europe [Member]
Unusual or Infrequent Item [Line Items]
Percentage Of Fair Value Exceeding Carrying Value		18.00%			18.00%
Europe [Member] \| Sale of Asset [Member]
Unusual or Infrequent Item [Line Items]
Unusual or Infrequent Item, Gain, Gross					$ (4.6)	0.0	0.0
Europe [Member] \| Asset Abandonment [Member]
Unusual or Infrequent Item [Line Items]
Special items, net					9.5	10.8	27.5
Europe [Member] \| Termination Fees and Other (Gains)/Losses [Member]
Unusual or Infrequent Item [Line Items]
Special items, net					0.0	0.0	10.0
International \| Asset Abandonment [Member]
Unusual or Infrequent Item [Line Items]
Special items, net					$ 0.0
U.S.
Unusual or Infrequent Item [Line Items]
Percentage Of Fair Value Exceeding Carrying Value		28.00%			28.00%
U.S. \| Other Employee-Related Costs [Member]
Unusual or Infrequent Item [Line Items]
Pension Expense		$ (5.4)
U.S. \| Asset Abandonment [Member]
Unusual or Infrequent Item [Line Items]
Special items, net					$ 14.5	$ 2.7	0.0
Heineken [Member]
Unusual or Infrequent Item [Line Items]
Gain (Loss) on Contract Termination \| £	£ 13.0
Proceeds From Collection of Termination Fees \| £								£ 8.0	£ 5.0
Montreal Brewery [Member] \| Estimated future charges [Member]
Unusual or Infrequent Item [Line Items]
Accelerated depreciation \| CAD			CAD 89.0
Plovdiv Brewery [Member] \| Cash proceeds [Member]
Unusual or Infrequent Item [Line Items]
Accounts and Other Receivables, Net, Current		$ 8.2			$ 8.2
Europe [Member]
Unusual or Infrequent Item [Line Items]
Loss on Contract Termination							29.4	£ 19.0
Europe [Member] \| Heineken [Member]
Unusual or Infrequent Item [Line Items]
Proceeds From Collection of Termination Fees							$ 19.4
CHINA
Unusual or Infrequent Item [Line Items]
Number of positions eliminated \| employee							125	125
Closing of brewing facility
Unusual or Infrequent Item [Line Items]
Number of positions eliminated \| employee							334	334	72	406