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Income Tax Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Oct. 11, 2016
Oct. 10, 2016
Tax loss carryforwards              
Statutory Federal income tax rate     35.00% 35.00% 35.00%    
Deferred Tax Assets, Operating Loss Carryforwards     $ 59.6        
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions     37.9 $ 32.7      
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions     0.0 0.0 $ 5.5    
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations     14.6 2.3 9.6    
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities     $ 12.8 0.0 $ 0.9    
Minimum              
Tax loss carryforwards              
Statutes of limitations, term     3 years        
Maximum              
Tax loss carryforwards              
Statutes of limitations, term     8 years        
Scenario, Forecast [Member] | Minimum              
Tax loss carryforwards              
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities   $ 1.0          
Scenario, Forecast [Member] | Maximum              
Tax loss carryforwards              
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities   $ 5.0          
Foreign Tax Authority [Member] | General Business              
Tax loss carryforwards              
Capital Loss Carryforwards, tax effect $ 151.0   $ 238.6 151.0      
State and Local Jurisdiction [Member] | General Business              
Tax loss carryforwards              
Capital Loss Carryforwards, tax effect 17.8   $ 35.8 17.8      
U.S.              
Tax loss carryforwards              
Statutory Federal income tax rate   21.00% 35.00%        
Europe Segment [Member] | Minimum              
Tax loss carryforwards              
Statutory Federal income tax rate     9.00%        
Europe Segment [Member] | Maximum              
Tax loss carryforwards              
Statutory Federal income tax rate     25.00%        
Europe | General Business              
Tax loss carryforwards              
Capital Loss Carryforwards, tax effect 849.0   $ 963.4 $ 849.0      
Canada              
Tax loss carryforwards              
Statutory Federal income tax rate     26.00%        
Millercoors [Member]              
Tax loss carryforwards              
Deferred Income Tax Expense (Benefit), Net $ 850.0            
Equity Method Investment, Ownership Percentage           42.00%  
SAB Miller [Member]              
Tax loss carryforwards              
Equity Method Investment, Ownership Percentage 58.00%     58.00%   58.00%  
Millercoors [Member]              
Tax loss carryforwards              
Equity Method Investment, Ownership Percentage 42.00%     42.00% 42.00% 100.00% 42.00%