Other Income and Expense (Details) CAD in Millions, $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2017 USD ($)	Mar. 31, 2017 CAD	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Other income and expense:
Other income (expense), net	$ (2.5)			$ 0.8	$ (0.6)	$ (44.9)
Foreign currency forwards [Member]
Other income and expense:
Unrealized Gain (Loss) on Derivatives				13.8		2.2
Bridge Facility Fees [Member]
Other income and expense:
Other Nonoperating Income (Expense)	0.0			(24.8)	0.0	(63.4)
Gain on Sale of Nonoperating Asset [Member]
Other income and expense:
Other Nonoperating Income (Expense)	0.0			8.8	0.0	8.8
Other Foreign Exchange and Derivative Activity [Member]
Other income and expense:
Other income (expense), net	(2.4)			16.7	(9.1)	9.8
Other income (expense), net [Member]
Other income and expense:
Other income (expense), net	$ (0.1)			0.1	$ 8.5	$ (0.1)
Lenders Party Thereto and Citibank [Member] | Bridge Loan | MillerCoors | Other income (expense), net [Member]
Other income and expense:
Other Financing Costs and Amortization of Financing Costs				$ (24.8)
Affiliated Entity [Member] | Purchase Price Adjustment [Member]
Other income and expense:
Other income (expense), net		CAD 10.6	$ 8.1