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Deconsolidation of RBH (Details)
$ in Millions, $ in Millions
3 Months Ended
Mar. 01, 2019
CAD ($)
litigation_case
Mar. 01, 2019
USD ($)
litigation_case
Mar. 31, 2020
USD ($)
litigation_case
Mar. 31, 2019
USD ($)
Mar. 22, 2019
USD ($)
Loss Contingencies [Line Items]          
Number of cases decided in favor of plaintiff | litigation_case     13    
Tax benefit for reversal of deferred tax liabilities     $ 16.0    
Marketing Administration And Research Costs [Member]          
Loss Contingencies [Line Items]          
Deconsolidation amount       $ 239.0  
Measurement Input, Discount Rate [Member] | Valuation Technique, Discounted Cash Flow [Member]          
Loss Contingencies [Line Items]          
Pending litigation liabilities measurement input         0.08
Measurement Input, Terminal Growth Rate [Member] | Valuation Technique, Discounted Cash Flow [Member]          
Loss Contingencies [Line Items]          
Pending litigation liabilities measurement input         0.025
RBH [Member]          
Loss Contingencies [Line Items]          
Amount deconsolidated from balance sheet         $ 3,519.0
Equity securities         3,280.0
Tax benefit for reversal of deferred tax liabilities       49.0  
RBH [Member] | Cash [Member]          
Loss Contingencies [Line Items]          
Amount deconsolidated from balance sheet         1,323.0
RBH [Member] | Goodwill [Member]          
Loss Contingencies [Line Items]          
Amount deconsolidated from balance sheet         1,463.0
RBH [Member] | Other Comprehensive Earnings [Member]          
Loss Contingencies [Line Items]          
Amount deconsolidated from balance sheet         529.0
RBH [Member] | Other Assets and Liabilities [Member]          
Loss Contingencies [Line Items]          
Amount deconsolidated from balance sheet         $ 204.0
Canada [Member] | Appellate Ruling [Member] | RBH [Member] | Smoking And Health Class Actions [Member] | Cecilia Letourneau & Conseil Quebecois Sur La Tabac Et La Sante and Jean-Yves Blais Cases [Member]          
Loss Contingencies [Line Items]          
Number of cases decided in favor of plaintiff | litigation_case 2 2      
Amount of litigation charge       194.0  
Amount of litigation charge net of tax       $ 142.0  
Amount of security ordered, funded by defendant $ 257 $ 194.1