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Commitments and Contingencies (Details) R$ in Millions, $ in Millions, ₩ in Billions	Mar. 31, 2019 BRL (R$)	Mar. 31, 2019 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2017 KRW (₩)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 KRW (₩)
Assessment
Loss Contingencies [Line Items]
Estimate of possible loss					$ 10.5	₩ 11.9
Additional Assessment
Loss Contingencies [Line Items]
Estimate of possible loss			$ 17.7	₩ 20.1
Federal, state and municipal tax authorities in Brazil | Assessment
Loss Contingencies [Line Items]
Estimate of possible loss	R$ 54.1	$ 13.9

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