Acquisition and Investments Consolidated Variable Interest Entity and Other (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Variable Interest Entity
Total assets	$ 30,246.9	$ 29,341.5
Liabilities	$ 16,811.9	17,719.8
Grolsch [Member]
Variable Interest Entity
MCBC economic Interest (as a percent)	49.00%
Total assets	$ 4.8	4.4
Liabilities	$ 0.2	0.5
Cobra
Variable Interest Entity
Interest Purchased (as a percent)	50.10%
Total assets	$ 20.2	14.2
Liabilities	$ 2.1	1.1
Rocky Mountain Metal Container [Member]
Variable Interest Entity
Interest Purchased (as a percent)	50.00%
Total assets	$ 74.4	70.2
Liabilities	$ 4.4	3.5
Rocky Mountain Bottle Company [Member]
Variable Interest Entity
Interest Purchased (as a percent)	50.00%
Total assets	$ 56.2	53.1
Liabilities	$ 4.6	$ 2.5