Commitments and Contingencies Loss Contingency (Details)	1 Months Ended	3 Months Ended				3 Months Ended	12 Months Ended		3 Months Ended		0 Months Ended	3 Months Ended
	Dec. 31, 2009 CAD	Mar. 31, 2014 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Kaiser purchased tax credits indemnity reserve, category two USD ($)	Mar. 31, 2015 Kaiser Tax, Civil and Labor Indemnity Reserve [Member] USD ($)	Dec. 31, 1990 Environmental matters Lowry [Member] USD ($)	Mar. 31, 2015 Environmental matters Lowry [Member] USD ($)	Mar. 31, 2015 Licensing Agreements [Member] Canada [Member] USD ($)	Mar. 31, 2014 Licensing Agreements [Member] Canada [Member] USD ($)	Dec. 12, 2014 David Hughes and 631992 Ontario Inc [Member] CAD	Mar. 31, 2015 Cervejarias Kaiser Brasil S.A. [Member] USD ($)	Mar. 31, 2014 Cervejarias Kaiser Brasil S.A. [Member] USD ($)
Loss Contingencies [Line Items]
Gain (loss) discontinued operations												$ 1,900,000	$ (1,900,000)
Equity interest sold (as a percent)						68.00%
Loss contingency, possible loss, maximum			82,000,000		109,500,000	68,000,000
Guarantees
Letter of credit provided to entity	10,000,000
Guarantees related to banks and other third parties noncurrent portion			4,800,000	5,300,000
Litigation and Other Disputes
Accrued liabilities, litigations and disputes			16,200,000	16,600,000
Loss contingency, possible loss, portion not accrued			76,000,000
Loss contingency, possible loss, minimum			0
Gain on litigation, favorable outcome		13,000,000
Income tax benefit, litigation settlement		(18,500,000)
Loss contingency, damages sought											1,400,000,000
Impairment of Intangible Assets, Finite-lived									8,900,000
Definite-lived intangible asset										4,900,000
Environmental
Environmental remediation expense, pretax charge							30,000,000
Environmental remediation threshold, assumed remediation cost								120,000,000
Inflation rate assumption, future costs (as a percent)								2.50%
Risk free rate of return assumption (as a percent)								2.24%
Site contingency, accrual, present value								3,200,000
Site contingency, accrual, undiscounted amount								$ 7,300,000