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Commitments and Contingencies - Legal, Tax, and Other Matters (Details) R$ in Millions, $ in Millions, ₩ in Billions	3 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 BRL (R$)
South Korea (SRTO) | Assessment
Loss Contingencies [Line Items]
Pre-assessment notice, amount			₩ 11.7
South Korea (SRTO) | Tax authority additional assessment
Loss Contingencies [Line Items]
Pre-assessment notice, amount	$ 18.5	₩ 20.1
Federal, state and municipal tax authorities in Brazil | Assessment
Loss Contingencies [Line Items]
Estimate of possible loss				$ 11.0	R$ 57.0

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

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