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Commitments and Contingencies (Details) $ in Millions, ₩ in Billions | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 KRW (₩)
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Hanjin |  |  |
Loss Contingencies [Line Items] |  |  |
Anticipated insurance recoveries | $ 4.0 |  |
Insurance claims |  |  |
Loss Contingencies [Line Items] |  |  |
Estimate of possible loss | 18.0 |  |
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] |  |  |
Loss contingency, outstanding receivable | $ 4.0 |  |

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