Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12021-110248

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Commitments and Contingencies - Legal, Tax, and Other Matters (Details) - Assessment R$ in Millions, $ in Millions, ₩ in Billions	3 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 KRW (₩)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 BRL (R$)
South Korea (SRTO)
Loss Contingencies [Line Items]
Pre-assessment notice, amount	$ 17.4	₩ 20.1	$ 9.8	₩ 11.3
Federal, state and municipal tax authorities in Brazil
Loss Contingencies [Line Items]
Estimate of possible loss					$ 12.2	R$ 49.1