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Debt Acquisition and Other (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2017	Sep. 30, 2017	Jul. 07, 2017	Jun. 30, 2017	May 03, 2012
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 750.0
Line of Credit Facility, Remaining Borrowing Capacity		495.0
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross		3.4
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	$ 400.0		$ 400.0
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
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%