Basis of Presentation and Summary of Significant Accounting Policies Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)
Capital Expenditures Incurred but Not yet Paid	$ 171.9	$ 214.9	$ 221.0
Other Current Assets, Period Expected for Recognition	12 months
Allowance For Obsolete Supplies Current	$ 16.4	11.4
Advertising expense	923.2	1,200.0	1,200.0
Interest income	3.3	8.2	8.0
Allowance for obsolete finished goods or packing materials	22.0	10.8
Other comprehensive income (loss), net of tax	(3.4)	$ 63.2	(292.0)
Deferred Income Tax Liabilities, Net	$ 21.5
Number of Reportable Segments | segment	2	4
Unusual Or Infrequent Item, Or Both, Temporary Pay Incentives Expense	$ 15.5
Coronavirus Global Pandemic [Member]
Liability for Estimated Sales Returns Due to Global Pandemic	30.3
Cost of Goods Sold, Obsolete Finished Keg Inventories	12.1
Allowance for Obsolete Inventory	22.0	$ 11.0
Accounts Receivable, Allowance for Credit Loss	18.0	12.0
Temporary Deferral, Income and Non-Income Based Tax Payments	$ 130.0
Returnable bottles
Useful economic lives, minimum (in years)	4 years
Crates
Useful economic lives, minimum (in years)	7 years
Returnable kegs
Useful economic lives, minimum (in years)	15 years
Returnable pallets
Useful economic lives, minimum (in years)	5 years
Dispensing equipment [Member]
Useful economic lives, minimum (in years)	7 years
Minimum | Buildings and improvements
Useful economic lives, minimum (in years)	20 years
Minimum | Machinery and equipment
Useful economic lives, minimum (in years)	3 years
Minimum | Furniture and fixtures
Useful economic lives, minimum (in years)	3 years
Minimum | Returnable containers
Useful economic lives, minimum (in years)	2 years
Minimum | Software
Useful economic lives, minimum (in years)	3 years
Maximum | Buildings and improvements
Useful economic lives, minimum (in years)	40 years
Maximum | Machinery and equipment
Useful economic lives, minimum (in years)	25 years
Maximum | Furniture and fixtures
Useful economic lives, minimum (in years)	10 years
Maximum | Returnable containers
Useful economic lives, minimum (in years)	15 years
Maximum | Software
Useful economic lives, minimum (in years)	5 years
Selling, General and Administrative Expenses [Member] | Millercoors [Member]
Business Combination, Acquisition Related Costs		$ 25.0	$ 38.8
Accounting Standards Update 2016-02 [Member]
Longest Remaining Lease Term	18 years