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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 ($)	Jun. 30, 2017 KRW (₩)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 BRL (R$)
Loss Contingencies [Line Items]
Aggregate amount including principal and interest					$ 33.0
Tax Authority, South Korea (SRTO) | Assessment | Foreign Tax Authority
Loss Contingencies [Line Items]
Pre-assessment notice, amount			$ 9.9	₩ 11.7
Tax Authority, South Korea (SRTO) | Tax authority additional assessment | Foreign Tax Authority
Loss Contingencies [Line Items]
Pre-assessment notice, amount	$ 16.9	₩ 20.1
Federal, state and municipal tax authorities in Brazil | Assessment | Foreign Tax Authority
Loss Contingencies [Line Items]
Estimate of possible loss					$ 10.5	R$ 58.8

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