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Commitments and Contingencies - Legal, Tax, and Other Matters (Details)
$ in Millions, ₩ in Billions
1 Months Ended 3 Months Ended
Nov. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
KRW (₩)
Assessment      
Loss Contingencies [Line Items]      
Estimate of possible loss   $ 10.4 ₩ 11.9
Pre-assessment      
Loss Contingencies [Line Items]      
Estimate of possible loss   17.6 ₩ 20.1
Collectibility of receivables | Hanjin      
Loss Contingencies [Line Items]      
Write off of customer receivables   5.8  
Loss contingency, outstanding receivables   7.0  
AGCS | Insurance Claims      
Loss Contingencies [Line Items]      
Estimate of possible loss   $ 18.0  
AGCS | Judicial Ruling      
Loss Contingencies [Line Items]      
Damages and interest awarded $ 24.5