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Income Tax (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Nov. 11, 2015
Operating Loss Carryforwards [Line Items]          
Effective tax rate (as a percent) 9.00% 182.00% 10.00% 12.00%  
Federal statutory income tax rate (percent)     35.00%    
Net discrete tax expense (benefit) $ 5.0 $ 14.3 $ 17.2 $ 18.6  
MillerCoors          
Operating Loss Carryforwards [Line Items]          
Business Acquisition, Percentage of Economic Interests Acquired         58.00%
Additional Paid-in Capital [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]          
Operating Loss Carryforwards [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption 8.0   8.0    
Other Expense [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]          
Operating Loss Carryforwards [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption $ 4.1   $ 4.1