Debt Acquisition and Other (Narrative) (Details) - USD ($) $ in Millions			3 Months Ended			6 Months Ended
	Jul. 19, 2017	Oct. 11, 2016	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jul. 07, 2017	May 03, 2012
Line of Credit Facility [Line Items]
Debt Instrument, Annual Principal Payment			$ 400.0			$ 400.0
Line of Credit Facility, Maximum Borrowing Capacity			750.0			750.0
Amortization of Debt Issuance Costs	$ 0.7		0.9			$ 4.6
EUR 2017 Notes USD Equivalent [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.35%
Debt Instrument, Description of Variable Rate Basis		EURIBOR
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross								$ 3.4
Interest Expense [Member] | MillerCoors Acquisition Term Loan [Member]
Line of Credit Facility [Line Items]
Other Financing Costs and Amortization of Financing Costs					$ 1.9		$ 3.7
Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount									$ 1,900.0
Three Year Tranche [Member] | MillerCoors Acquisition Term Loan [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Annual Principal Payment				$ 800.0
Five Year Tranche [Member] | MillerCoors Acquisition Term Loan [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Annual Principal Payment				$ 700.0
Unused lines of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity								$ 150.0
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt instrument, term						5 years
Line of Credit Facility, Maximum Borrowing Capacity			1,500.0			$ 1,500.0
Amortization of Debt Issuance Costs			0.4
MillerCoors | Other income (expense), net [Member] | Bridge Loan
Line of Credit Facility [Line Items]
Amortization of Debt Issuance Costs					$ 20.2		$ 38.6
Lenders Party Thereto and Citibank [Member] | MillerCoors | Interest Expense [Member] | MillerCoors Acquisition Term Loan [Member]
Line of Credit Facility [Line Items]
Other Financing Costs and Amortization of Financing Costs			$ 1.0			$ 5.0
Lenders Party Thereto and Citibank [Member] | MillerCoors | Three Year Tranche [Member] | Three Year Tranche [Member] | MillerCoors Acquisition Term Loan [Member]
Line of Credit Facility [Line Items]
Debt instrument, term				3 years
Lenders Party Thereto and Citibank [Member] | MillerCoors | Five Year Tranche [Member] | Five Year Tranche [Member] | MillerCoors Acquisition Term Loan [Member]
Line of Credit Facility [Line Items]
Debt instrument, term						5 years
Parent Company [Member] | Senior Notes [Member] | Senior Notes Due 2017 $300M 2.0% [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount									$ 300.0
Debt Instrument, Interest Rate, Stated Percentage									2.00%