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Acquisition and Investments Proportional (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Oct. 10, 2016
Schedule of Equity Method Investments [Line Items]          
Equity income in MillerCoors $ 0.0 $ 156.9 $ 0.0 $ 491.2  
Special items $ 4.1 (4.9) $ 24.4 (79.0)  
MillerCoors          
Schedule of Equity Method Investments [Line Items]          
Net income attributable to MillerCoors   $ 369.2   $ 1,134.0  
MCBC economic interest   42.00%   42.00% 42.00%
MCBC proportionate share of MillerCoors net income   $ 155.1   $ 476.3  
Amortization of the difference between MCBC contributed cost basis and proportionate share of the underlying equity in the net assets of MillerCoors   1.1   3.3  
Share-based compensation adjustment   (0.5)   (0.7)  
U.S. import tax benefit   1.2   12.3  
Equity income in MillerCoors   156.9   491.2  
Special items   8.3   84.6  
Accelerated depreciation expense   $ 34.3   103.2  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments       $ 25.7