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Acquisition and Investments MCBC proportional share in MillerCoors (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Oct. 10, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Oct. 11, 2016
Schedule of Equity Method Investments [Line Items]          
MillerCoors owners' equity   $ 11,418.7 $ 7,043.0    
Investment in MillerCoors   0.0 2,441.0    
Equity income in MillerCoors   $ 500.9 516.3 $ 561.8  
Millercoors [Member]          
Schedule of Equity Method Investments [Line Items]          
MillerCoors owners' equity $ 7,822.3   7,292.8    
Net income attributable to MillerCoors $ 1,157.2   $ 1,217.8 $ 1,326.2  
MCBC economic Interest (as a percent) 42.00% 42.00% 42.00% 42.00% 100.00%
MCBC proportionate share in MillerCoors' equity $ 3,285.4   $ 3,063.0    
Difference between MCBC contributed cost basis and proportionate share of the underlying equity in net assets of MillerCoors (653.7)   (657.0)    
Accounting policy elections 35.0   35.0    
Investment in MillerCoors 2,666.7   2,441.0    
MCBC proportionate share of MillerCoors net income 486.0   511.5 $ 557.0  
Amortization of the difference between MCBC contributed cost basis and proportionate share of the underlying equity in net assets of MillerCoors 3.3   4.6 4.6  
Share-based compensation adjustment (0.7)   0.2 0.2  
Equity Method Investment, Adjustment, Import Tax Benefit 12.3   0.0 0.0  
Equity income in MillerCoors $ 500.9   $ 516.3 $ 561.8