Accounting Changes	12 Months Ended
Dec. 31, 2016
Accounting Changes and Error Corrections [Abstract]
Accounting Changes	Change in Accounting Estimate At the end of 2015, we changed the approach used to measure service and interest costs for pension and other postretirement benefits. In prior years, we measured service and interest costs utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. For 2016, we measured service and interest costs by applying the specific spot rates along that yield curve to the plans’ liability cash flows. We believe this approach provides a more precise measurement of service and interest costs by aligning the timing of the plans’ liability cash flows to the corresponding spot rates on the yield curve. This change does not affect the measurement of our plan obligations. We have accounted for this change as a change in accounting estimate and, accordingly, have applied it on a prospective basis. Our adoption of the full yield curve approach reduced 2016 service and interest cost by approximately $4.5 million ($2.8 million after-tax) as compared to the previous method. New Accounting Pronouncements Adopted Consolidation In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810) Amendments to the Consolidation Analysis, which amends the analysis required to determine whether to consolidate certain types of legal entities such as limited partnerships, limited liability corporations, and certain securitization structures. The new guidance was effective for us beginning in the first quarter of 2016. Application of the new guidance did not impact our financial statements or related disclosures. Fair Value Measurement In May 2015, the FASB issued ASU 2015-07, Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) (ASU 2015-07). ASU 2015-07 eliminates the requirement to categorize within the fair value hierarchy investments for which the fair values are estimated using the net asset value practical expedient. In addition, the requirement to make specific disclosures for all investments eligible to be assessed at fair value with the net asset value per share practical expedient has been removed. Instead, such disclosures are restricted only to investments that the entity has decided to measure using the practical expedient. The new guidance was effective for us beginning in the first quarter of 2016. However, none of our consolidated investments were valued using this method, although certain investments held within our funded pension plans are subject to this change. The amendment impacts the disclosure in our notes to the financial statements but does not have an effect on our financial statements. Business Combinations In September 2015, the FASB issued ASU 2015-16, Business Combinations (Topic 805), Simplifying the Accounting for Measurement-Period Adjustments, which requires the acquirer in a business combination to recognize measurement-period adjustments in the period in which it determines the amount of the adjustment. The new guidance was effective for us in the first quarter of 2016. Application of the new guidance did not impact our financial statements and related disclosures. New Accounting Pronouncements Not Yet Adopted Revenue from Contracts with Customers In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes most current revenue recognition guidance, including industry-specific guidance. Subsequently, the FASB has issued updates which provide additional implementation guidance. The new guidance requires companies to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration it expects to be entitled to in exchange for those goods or services. The FASB delayed the effective date of this guidance to the first quarter of 2018, with early adoption permitted as of the original effective date of the first quarter of 2017. We plan to adopt this guidance as of January 1, 2018 using the modified retrospective approach. Our primary source of revenue is lease revenue, which will continue to be within the scope of existing lease accounting guidance upon adoption of Topic 606. With respect to our other revenue elements, marine operating revenue is our biggest component. The new standard may modify the recognition timing of certain in-transit cargo revenue, but we do not expect such changes to have a material impact on our financial statements. Leases In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which supersedes most current lease guidance. The new guidance requires companies to recognize most leases on the balance sheet and modifies accounting, presentation, and disclosure for both lessors and lessees. The new guidance is effective for us in the first quarter of 2019 with early adoption permitted, using a modified retrospective transition method. We plan to adopt this guidance on January 1, 2019. We are evaluating the effect that the new guidance will have on our consolidated financial statements and related disclosures. Financial Instruments In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities, which modifies the accounting and reporting requirements for certain equity securities and financial liabilities. The new guidance is effective for us beginning in the first quarter of 2018 with certain provisions eligible for early adoption. We do not expect the new guidance to have a significant impact on our financial statements or related disclosures. Equity Method and Joint Ventures In March 2016, the FASB issued ASU 2016-07, Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting, which eliminates the requirement to retrospectively apply equity method accounting when an entity increases ownership or influence in a previously held investment. The new guidance is effective for us in the first quarter of 2017 with early adoption permitted. We do not expect the new guidance to impact our financial statements or related disclosures. Stock Compensation In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which simplifies and clarifies certain aspects of share-based payment accounting and presentation. The new guidance is effective for us in the first quarter of 2017 with early adoption permitted. We do not expect the guidance to have a significant impact on our financial statements or related disclosures. Credit Losses In June 2016, the FASB issued ASU 2016-13, Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which modifies how entities will measure credit losses. The new guidance is effective for us in the first quarter of 2020 with early adoption permitted. We are evaluating the effect that the new guidance will have on our financial statements and related disclosures. Statement of Cash Flows In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which clarifies the classification of certain cash receipts and payments in the statement of cash flows. The new guidance is effective for us in the first quarter of 2018 with early adoption permitted. We do not expect the new guidance to have a significant impact on our financial statements or related disclosures. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force), which clarifies the classification and presentation of changes in restricted cash on the statement of cash flows. The new guidance is effective for us in the first quarter of 2018 with early adoption permitted. We do not expect the new guidance to have a significant impact on our financial statements or related disclosures. Income Taxes In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory, which modifies how an entity will recognize the income tax consequences of an intra-entity transfer of an asset when the transfer occurs. The new guidance is effective for us in the first quarter of 2018 with early adoption permitted. We are evaluating the effect that the new guidance will have on our financial statements and related disclosures.

Change in Accounting Estimate

At the end of 2015, we changed the approach used to measure service and interest costs for pension and other postretirement benefits. In prior years, we measured service and interest costs utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. For 2016, we measured service and interest costs by applying the specific spot rates along that yield curve to the plans’ liability cash flows. We believe this approach provides a more precise measurement of service and interest costs by aligning the timing of the plans’ liability cash flows to the corresponding spot rates on the yield curve. This change does not affect the measurement of our plan obligations. We have accounted for this change as a change in accounting estimate and, accordingly, have applied it on a prospective basis. Our adoption of the full yield curve approach reduced 2016 service and interest cost by approximately $4.5 million ($2.8 million after-tax) as compared to the previous method.

New Accounting Pronouncements Adopted

Consolidation

In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810) Amendments to the Consolidation Analysis, which amends the analysis required to determine whether to consolidate certain types of legal entities such as limited partnerships, limited liability corporations, and certain securitization structures. The new guidance was effective for us beginning in the first quarter of 2016. Application of the new guidance did not impact our financial statements or related disclosures.

Fair Value Measurement

In May 2015, the FASB issued ASU 2015-07, Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) (ASU 2015-07). ASU 2015-07 eliminates the requirement to categorize within the fair value hierarchy investments for which the fair values are estimated using the net asset value practical expedient. In addition, the requirement to make specific disclosures for all investments eligible to be assessed at fair value with the net asset value per share practical expedient has been removed. Instead, such disclosures are restricted only to investments that the entity has decided to measure using the practical expedient. The new guidance was effective for us beginning in the first quarter of 2016. However, none of our consolidated investments were valued using this method, although certain investments held within our funded pension plans are subject to this change. The amendment impacts the disclosure in our notes to the financial statements but does not have an effect on our financial statements.

Business Combinations

In September 2015, the FASB issued ASU 2015-16, Business Combinations (Topic 805), Simplifying the Accounting for Measurement-Period Adjustments, which requires the acquirer in a business combination to recognize measurement-period adjustments in the period in which it determines the amount of the adjustment. The new guidance was effective for us in the first quarter of 2016. Application of the new guidance did not impact our financial statements and related disclosures.

New Accounting Pronouncements Not Yet Adopted

Revenue from Contracts with Customers

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes most current revenue recognition guidance, including industry-specific guidance. Subsequently, the FASB has issued updates which provide additional implementation guidance. The new guidance requires companies to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration it expects to be entitled to in exchange for those goods or services. The FASB delayed the effective date of this guidance to the first quarter of 2018, with early adoption permitted as of the original effective date of the first quarter of 2017. We plan to adopt this guidance as of January 1, 2018 using the modified retrospective approach. Our primary source of revenue is lease revenue, which will continue to be within the scope of existing lease accounting guidance upon adoption of Topic 606. With respect to our other revenue elements, marine operating revenue is our biggest component. The new standard may modify the recognition timing of certain in-transit cargo revenue, but we do not expect such changes to have a material impact on our financial statements.

Leases

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which supersedes most current lease guidance. The new guidance requires companies to recognize most leases on the balance sheet and modifies accounting, presentation, and disclosure for both lessors and lessees. The new guidance is effective for us in the first quarter of 2019 with early adoption permitted, using a modified retrospective transition method. We plan to adopt this guidance on January 1, 2019. We are evaluating the effect that the new guidance will have on our consolidated financial statements and related disclosures.

Financial Instruments

In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities, which modifies the accounting and reporting requirements for certain equity securities and financial liabilities. The new guidance is effective for us beginning in the first quarter of 2018 with certain provisions eligible for early adoption. We do not expect the new guidance to have a significant impact on our financial statements or related disclosures.

Equity Method and Joint Ventures

In March 2016, the FASB issued ASU 2016-07, Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting, which eliminates the requirement to retrospectively apply equity method accounting when an entity increases ownership or influence in a previously held investment. The new guidance is effective for us in the first quarter of 2017 with early adoption permitted. We do not expect the new guidance to impact our financial statements or related disclosures.

Stock Compensation

In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which simplifies and clarifies certain aspects of share-based payment accounting and presentation. The new guidance is effective for us in the first quarter of 2017 with early adoption permitted. We do not expect the guidance to have a significant impact on our financial statements or related disclosures.

Credit Losses

In June 2016, the FASB issued ASU 2016-13, Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which modifies how entities will measure credit losses. The new guidance is effective for us in the first quarter of 2020 with early adoption permitted. We are evaluating the effect that the new guidance will have on our financial statements and related disclosures.

Statement of Cash Flows

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which clarifies the classification of certain cash receipts and payments in the statement of cash flows. The new guidance is effective for us in the first quarter of 2018 with early adoption permitted. We do not expect the new guidance to have a significant impact on our financial statements or related disclosures.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force), which clarifies the classification and presentation of changes in restricted cash on the statement of cash flows. The new guidance is effective for us in the first quarter of 2018 with early adoption permitted. We do not expect the new guidance to have a significant impact on our financial statements or related disclosures.

Income Taxes

In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory, which modifies how an entity will recognize the income tax consequences of an intra-entity transfer of an asset when the transfer occurs. The new guidance is effective for us in the first quarter of 2018 with early adoption permitted. We are evaluating the effect that the new guidance will have on our financial statements and related disclosures.