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Nature of Operations and Significant Accounting Policies - Narrative (Details) mi in Thousands, $ in Millions | Mar. 31, 2018 USD ($) state mi
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Total number of rail route miles | mi | 21
Number of states rail network serves | state | 23
Accumulated Other Comprehensive Income (Loss) |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Reclassification adjustment | $ 107
Retained Earnings |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Reclassification adjustment | $ (107)

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- Definition Rail Route Network, Distance + References No definition available. + Details
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