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Goodwill and Intangible Assets - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
segment
Indefinite-lived Intangible Assets [Line Items]      
Number of Reportable Segments | segment   2 4
Goodwill, impairment loss   $ 1,484.3 $ 674.4
Europe [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Goodwill, impairment loss $ 1,484.3 1,484.3 6.1
Goodwill and intangible asset impairment     12.2
Other Intangible Assets [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Indefinite-lived Intangible Assets (Excluding Goodwill) 307.6 307.6 337.6
Brands      
Indefinite-lived Intangible Assets [Line Items]      
Indefinite-lived Intangible Assets (Excluding Goodwill) 8,215.7 8,215.7 $ 8,172.4
Staropramen brand indefinite-lived intangible assets [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 621.7 $ 621.7  
Staropramen brand indefinite-lived intangible assets [Member] | Europe [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Percentage Of Fair Value Exceeding Carrying Value 9.00% 9.00%  
Held for sale | Other Intangible Assets [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Disposal Group, Including Discontinued Operation, Intangible Assets $ 30.0 $ 30.0