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Commitments and Contingencies - Legal, Tax, and Other Matters (Details) - Dec. 31, 2017 R$ in Millions, $ in Millions, ₩ in Billions	USD ($)	BRL (R$)	KRW (₩)
South Koria (SRTO) | Assessment
Loss Contingencies [Line Items]
Estimate of possible loss	$ 10.6		₩ 11.9
South Koria (SRTO) | Pre-assessment
Loss Contingencies [Line Items]
Estimate of possible loss	17.9		₩ 20.1
Federal, state and municipal tax authorities in Brazil | Assessment
Loss Contingencies [Line Items]
Estimate of possible loss	$ 13.7	R$ 52.4

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