Basis of Presentation	9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation In the opinion of the management of KCS, the accompanying unaudited consolidated financial statements contain all adjustments (consisting of normal and recurring adjustments) necessary to fairly present the results for interim periods in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”). Pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), certain information and note disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. These consolidated financial statements should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. The results of operations for the three and nine months ended September 30, 2017, are not necessarily indicative of the results to be expected for the full year ending December 31, 2017. Certain prior year amounts have been reclassified to conform to the current year presentation. During the first quarter of 2017, the Company adopted Accounting Standards Update (“ASU”) No. 2016-09, Improvements to Employee Share-Based Payment Accounting. The Company now recognizes forfeitures as they occur rather than estimating a forfeiture rate for the year. Excess tax benefits or deficiencies resulting from the exercise or vesting of awards are included in income tax expense in the reporting period in which they occur. Upon adoption, the Company recognized a cumulative-effect adjustment to equity at the beginning of 2017, as disclosed in Note 10 - Equity. During the third quarter of 2017, the Company early adopted ASU No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities. The Company now asserts qualitatively, on a quarterly basis, that the hedging relationship was and continues to be highly effective as long as facts and circumstances related to the hedging relationship have not changed. If facts and circumstances have changed, the Company will perform a quantitative assessment to ensure the hedging relationship is still deemed highly effective. In addition, the ineffective portion of an effective hedge is no longer measured periodically and included in the income statement; rather, the total periodic change in fair value of an effective hedge is included in accumulated other comprehensive income on the balance sheet, until settlement occurs. The adoption of the new guidance had no impact on the Company’s consolidated financial statements as there was no ineffectiveness recognized on the Company’s cash flow hedges prior to adoption.

Basis of Presentation

In the opinion of the management of KCS, the accompanying unaudited consolidated financial statements contain all adjustments (consisting of normal and recurring adjustments) necessary to fairly present the results for interim periods in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”). Pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), certain information and note disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. These consolidated financial statements should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. The results of operations for the three and nine months ended September 30, 2017, are not necessarily indicative of the results to be expected for the full year ending December 31, 2017. Certain prior year amounts have been reclassified to conform to the current year presentation.

During the first quarter of 2017, the Company adopted Accounting Standards Update (“ASU”) No. 2016-09, Improvements to Employee Share-Based Payment Accounting. The Company now recognizes forfeitures as they occur rather than estimating a forfeiture rate for the year. Excess tax benefits or deficiencies resulting from the exercise or vesting of awards are included in income tax expense in the reporting period in which they occur. Upon adoption, the Company recognized a cumulative-effect adjustment to equity at the beginning of 2017, as disclosed in Note 10 - Equity.

During the third quarter of 2017, the Company early adopted ASU No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities. The Company now asserts qualitatively, on a quarterly basis, that the hedging relationship was and continues to be highly effective as long as facts and circumstances related to the hedging relationship have not changed. If facts and circumstances have changed, the Company will perform a quantitative assessment to ensure the hedging relationship is still deemed highly effective. In addition, the ineffective portion of an effective hedge is no longer measured periodically and included in the income statement; rather, the total periodic change in fair value of an effective hedge is included in accumulated other comprehensive income on the balance sheet, until settlement occurs. The adoption of the new guidance had no impact on the Company’s consolidated financial statements as there was no ineffectiveness recognized on the Company’s cash flow hedges prior to adoption.