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Commitments and Contingencies (Details) R$ in Millions, $ in Millions, ₩ in Billions	3 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 BRL (R$)	Jun. 30, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)
Tax Authority, South Korea (SRTO) | Assessment
Loss Contingencies [Line Items]
Income tax assessment notice, amount | $		$ 9.7
Estimate of possible loss | ₩						₩ 11.3
Tax Authority, South Korea (SRTO) | Additional Assessment
Loss Contingencies [Line Items]
Income tax assessment notice, amount | $	$ 17.3
Estimate of possible loss | ₩					₩ 20.1
Federal, State and Municipal Tax Authorities in Brazil | Assessment
Loss Contingencies [Line Items]
Estimate of possible loss			$ 8.7	R$ 49.1

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The amount of estimated penalties recognized in the period arising from income tax examinations.

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