Kansas City Southern (KSU) 10-K 3 Feb 23 2022 FY Annual report Financial data

Document and Entity Information

Document and Entity Information Document - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 02, 2023	Jun. 30, 2022
Cover [Abstract]
Amendment Flag	false
Entity Central Index Key	0000054480
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Public Float			$ 0
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
Entity File Number	1-4717
Entity Registrant Name	KANSAS CITY SOUTHERN
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	87-3883291
Entity Address, Address Line One	427 West 12th Street
Entity Address, City or Town	Kansas City
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	64105
City Area Code	816
Local Phone Number	983.1303
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	true
Entity Common Stock, Shares Outstanding		100
Documents Incorporated by Reference	Portions of the registrant’s subsequent amendment to the Form 10-K to be filed within 120 days of December 31, 2022 are incorporated by reference in this Annual Report on Form 10-K in response to Part III, Items 10, 11, 12, 13 and 14.

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2022
Audit Information [Abstract]
Auditor Firm ID	238
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Kansas City, Missouri

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenues	$ 3,370.4	$ 2,947.3	$ 2,632.6
Operating expenses:
Compensation and benefits	567	522	476.5
Purchased services	225.9	211.8	198.1
Fuel	461.7	313.6	219.8
Equipment costs	91.4	82.2	85.8
Depreciation and amortization	390.9	365.8	357.9
Materials and other	359.8	304.1	260.9
Merger costs, net	46.6	264	0
Write-off of software development costs	0	0	13.6
Restructuring charges	0	0	17
Total operating expenses	2,143.3	2,063.5	1,629.6
Operating income	1,227.1	883.8	1,003
Equity in net earnings (losses) of affiliates	8.7	16.7	(1.4)
Interest expense	(156.6)	(156)	(150.9)
Foreign exchange loss	(33.2)	(9)	(29.6)
Gain on settlement of treasury lock agreements	259.3	0	0
Other income, net	4.4	2.6	2.1
Income before income taxes	1,309.7	738.1	823.2
Income tax expense	325.9	211.1	204.1
Net income	983.8	527	619.1
Less: Net income attributable to noncontrolling interest	1.6	1.8	2.1
Net income attributable to Kansas City Southern and subsidiaries	982.2	525.2	617
Preferred stock dividends	0	0.2	0.2
Net income available to common stockholder(s)	$ 982.2	$ 525	$ 616.8

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 983.8	$ 527	$ 619.1
Other comprehensive income (loss):
Unrealized gain on interest rate derivative instruments, net of tax of $42.4 million, $4.6 million and $7.5 million	159.5	17.2	28.1
Reclassification of interest rate derivative instruments gain, net of tax of $(54.5) million	(204.8)	0	0
Reclassification adjustment from cash flow hedges included in net income, net of tax of $0.5 million for each year presented	1.9	2	1.9
Foreign currency translation adjustments	0.6	(0.2)	(0.5)
Other comprehensive income (loss)	(42.8)	19	29.5
Comprehensive income	941	546	648.6
Less: comprehensive income attributable to noncontrolling interest	1.6	1.8	2.1
Comprehensive income attributable to Kansas City Southern and subsidiaries	$ 939.4	$ 544.2	$ 646.5

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Tax effect on unrealized gain on interest rate derivative instruments	$ 42.4	$ 4.6	$ 7.5
Tax effect on reclassification of interest rate derivative instruments gain	(54.5)
Tax effect on reclassification adjustment from cash flow hedges included in net income	$ 0.5	$ 0.5	$ 0.5

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 207.6	$ 339.3
Accounts receivable, net	543.6	271
Materials and supplies	174.2	131
Other current assets	138.8	142.1
Total current assets	1,064.2	883.4
Operating lease right-of-use assets	100.9	69.6
Investments	55.8	48.3
Property and equipment (including concession assets), net	9,362.4	9,209.3
Other assets	94.1	217.5
Total assets	10,677.4	10,428.1
Current liabilities:
Long-term debt due within one year	655	8.8
Accounts payable and accrued liabilities	635.7	479.7
Total current liabilities	1,290.7	488.5
Long-term operating lease liabilities	71.5	46.4
Long-term debt	3,124.6	3,768.8
Deferred income taxes	1,237.1	1,213.7
Other noncurrent liabilities and deferred credits	158.7	178.1
Total liabilities	5,882.6	5,695.5
Stockholders’ equity:
$0.01 par, common stock, 100 shares authorized, 100 shares issued; 100 shares outstanding at December 31, 2022 and 2021	0	0
Additional paid-in capital	860.6	860.6
Retained earnings	3,626.6	3,524.4
Accumulated other comprehensive income (loss)	(23.4)	19.4
Total stockholders’ equity	4,463.8	4,404.4
Noncontrolling interest	331	328.2
Total equity	4,794.8	4,732.6
Total liabilities and equity	$ 10,677.4	$ 10,428.1

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2022	Dec. 31, 2021	Dec. 14, 2021
Stockholders’ equity:
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100	100
Common Stock, Shares Issued	100	100
Common Stock, Shares Outstanding	100	100

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities:
Net income	$ 983.8	$ 527	$ 619.1
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Depreciation and amortization	390.9	365.8	357.9
Deferred income taxes	35	23.2	49.4
Equity in net (earnings) losses of affiliates	(8.7)	(16.7)	1.4
Share-based compensation	0	24.5	22.9
Loss on foreign currency derivative instruments	44.3	3.7	22.5
Foreign exchange (gain) loss	(11.1)	5.3	7.1
Merger costs, net	46.6	264	0
Restructuring charges	0	0	17
Gain on settlement of treasury lock agreements	(259.3)	0	0
Write-off of software development costs	0	0	13.6
Distributions from affiliates	6.5	12	4.5
Settlement of foreign currency derivative instruments	(5.1)	(1.9)	(20)
Cash payments for merger costs	(34.1)	(2,287.2)	0
Reimbursement of merger termination fees	0	2,100	0
Changes in working capital items:
Accounts receivable	(269.1)	(30.6)	25.5
Materials and supplies	(42.1)	1.9	21.7
Other current assets	89.3	(54.7)	(66)
Accounts payable and accrued liabilities	98.8	(9.9)	6
Other, net	7.4	9.4	(2.6)
Net cash provided by operating activities	1,073.1	935.8	1,080
Investing activities:
Capital expenditures	(529)	(496.8)	(411.9)
Settlement of treasury lock agreements	259.3	0	0
Purchase or replacement of assets under operating leases	0	0	(78.2)
Property investments in MSLLC	(27.1)	(24.2)	(24.8)
Investments in and advances to affiliates	(8.5)	(7.8)	(7.4)
Proceeds from disposal of property	6.5	6.4	12.9
Other, net	(13.7)	(8.8)	(16.6)
Net cash used for investing activities	(312.5)	(531.2)	(526)
Financing activities:
Proceeds from issuance of long-term debt	0	0	545.6
Repayment of long-term debt	(10.5)	(7.9)	(18)
Dividends paid	(880)	(188)	(152.3)
Shares repurchased	0	0	(888.9)
Debt issuance and retirement costs paid	0	0	(6.6)
Cash settlement of stock options	0	(75.2)	0
Proceeds from employee stock plans	0	19.9	9.9
Net cash used for financing activities	(890.5)	(251.2)	(510.3)
Effect of exchange rate changes on cash	(1.8)	(2.3)	(4.3)
Cash and cash equivalents:
Net increase (decrease) during each year	(131.7)	151.1	39.4
At beginning of year	339.3	188.2	148.8
At end of year	207.6	339.3	188.2
Non-cash investing and financing activities:
Capital expenditures accrued but not yet paid at end of year	0.6	14.1	21.5
Other investing activities accrued but not yet paid at the end of the year	32.4	35.6	31.9
Finance lease obligations incurred	9.1	11.5	0.8
Non-cash asset acquisitions	0.4	4.2	2.8
Dividends accrued but not yet paid at end of year	0	0	40.6
Cash payments:
Interest paid, net of amounts capitalized	152.2	152.7	144.5
Income tax payments, net of refunds	$ 275.8	$ 173	$ 182.3

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	$25 Par Preferred Stock [Member]	$25 Par Preferred Stock [Member]	$.01 Par Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] $25 Par Preferred Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Non-controlling Interest [Member]
Balance at Dec. 31, 2019	$ 4,745.9		$ 5.6	$ 1	$ 843.7	$ 3,601.3		$ (29.1)	$ 323.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	619.1					617			2.1
Other comprehensive income (loss)	29.5							29.5
Contributions from noncontrolling interest	0.9								0.9
Dividends on common stock	(153.7)				0	(153.7)
Dividends on preferred stock		$ (0.2)					$ (0.2)
Share repurchases	(896.4)		(0.2)	(0.1)	(51.3)	(844.8)
Forward contract for accelerated share repurchases	(75)				(75)
Settlement of forward contract for accelerated share repurchases	82.5				82.5
Options exercised and stock subscribed, net of shares withheld for employee taxes	6.2			0	6.2
Share-based compensation	24.8				24.8
Balance at Dec. 31, 2020	4,383.6		5.4	0.9	830.9	3,219.6		0.4	326.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	527					525.2			1.8
Other comprehensive income (loss)	19							19
Dividends on common stock	(147.3)				0	(147.3)
Dividends on preferred stock		$ (0.2)					$ (0.2)
Share repurchases	(75)		0	0	(2.1)	(72.9)
Settlement of forward contract for accelerated share repurchases	75				75
Options exercised and stock subscribed, net of shares withheld for employee taxes	(0.2)			0	(0.2)
Share-based compensation	80.4				80.4
Replacement of equity share awards with liability awards	(54.5)				(54.5)
Cash settlement of stock options	(75.2)				(75.2)
Recapitalization of stock	0		(5.4)	(0.9)	6.3
Balance at Dec. 31, 2021	4,732.6		0	0	860.6	3,524.4		19.4	328.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	983.8					982.2			1.6
Other comprehensive income (loss)	(42.8)							(42.8)
Contributions from noncontrolling interest	1.2								1.2
Dividends to Canadian Pacific	(880)					(880)
Balance at Dec. 31, 2022	$ 4,794.8		$ 0	$ 0	$ 860.6	$ 3,626.6		$ (23.4)	$ 331

Consolidated Statement of Chang

Consolidated Statement of Changes in Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Common Stock, Dividends Per Share	$ 1.62	$ 1.64
$25 Par Preferred Stock [Member]
Preferred Stock, Par Value	25	25
Preferred Stock, Dividends Per Share	$ 0.75	$ 1

Description of the Business

Description of the Business	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business	Description of the Business Kansas City Southern (“KCS” or the “Company”), a Delaware corporation, is a holding company with principal operations in rail transportation. On September 15, 2021, KCS and CP entered into a merger agreement (the “Merger Agreement”) and on December 14, 2021, CP acquired the outstanding common and preferred stock of KCS. Each share of common stock, par value $0.01 per share, of KCS that was outstanding immediately prior to the merger was converted into the right to receive (1) 2.884 common shares of CP and (2) $90 in cash (together, the “Merger Consideration”), and each share of preferred stock, par value $25 per share, that was outstanding immediately prior to the merger was converted into the right to receive $37.50 in cash. The Merger Consideration value received by KCS stockholders was $301.20 per KCS common share. As CP acquired the outstanding common and preferred stock of KCS, earnings per share data is not presented because the Company does not have any outstanding or issued publicly traded stock. The merger is further discussed in Note 3, Merger Agreement. The Company is engaged in the freight rail transportation business operating through a single coordinated rail network under one reportable business segment. The Company generates revenues and cash flows by providing its customers with freight delivery services both within its regions, and throughout North America through connections with other Class I rail carriers. KCS’s customers conduct business in a number of different industries, including electric-generating utilities, chemical and petroleum products, paper and forest products, agriculture and mineral products, automotive products, and intermodal transportation. The primary subsidiaries of the Company consist of the following: • The Kansas City Southern Railway Company (“KCSR”), a wholly-owned consolidated subsidiary. KCSR is a U.S. Class I railroad that services the midwest and southeast regions of the United States; • Kansas City Southern de México, S.A. de C.V. (“KCSM”), a wholly-owned consolidated subsidiary which operates under the rights granted by the concession acquired from the Mexican government in 1997 (the “Concession”) as described below; • Mexrail, Inc. (“Mexrail”), a wholly-owned consolidated subsidiary; which wholly owns The Texas Mexican Railway Company (“Tex-Mex”); • Meridian Speedway, LLC (“MSLLC”), a seventy percent-owned consolidated affiliate. MSLLC owns the former KCSR rail line between Meridian, Mississippi and Shreveport, Louisiana, which is the portion of the rail line between Dallas, Texas and Meridian known as the “Meridian Speedway”. Including equity investments in: • Panama Canal Railway Company (“PCRC”), a fifty percent-owned unconsolidated affiliate which provides ocean to ocean freight and passenger services along the Panama Canal; • TFCM, S. de R.L. de C.V. (“TCM”), a forty-five percent-owned unconsolidated affiliate that operates a bulk liquid terminal in San Luis Potosí, Mexico; • Ferrocarril y Terminal del Valle de México, S.A. de C.V. (“FTVM”), a twenty-five percent-owned unconsolidated affiliate that provides railroad services as well as ancillary services in the greater Mexico City area; and • PTC-220, LLC (“PTC-220”), a thirteen percent-owned unconsolidated affiliate that holds the licenses to large blocks of radio spectrum and other assets for positive train control. The KCSM Concession. KCSM holds a concession (the “Concession”) from the Mexican government until June 2047, which is renewable under certain conditions for additional periods of up to 50 years under the Concession. The Concession is to provide freight transportation services over north-east rail lines which are a primary commercial corridor of the Mexican railroad system. KCSM has the right to use, but does not own, all track and buildings that are necessary for the rail lines’ operation. KCSM is required to pay the Mexican government an annual concession duty equal to 1.25% of gross revenues during the Concession period. On July 14, 2022, KCSM reached an agreement with the Mexican Ministry of Infrastructure, Communications and Transportation (“SICT”) to fund a new investment in the Celaya-NBA Line Railway Bypass and related infrastructure in an amount not to exceed Ps.4.0 billion (approximately $200.0 million USD). In exchange for the investment, the SICT agreed to amend KCSM’s Concession Title effective July 14, 2022, to extend the exclusivity rights granted to KCSM (subject to certain trackage and haulage rights granted to other concessionaires) for an additional period of 10 years. Under this amendment, KCSM’s exclusivity will now expire in 2037. Employees and Labor Relations. KCSR participates in industry-wide multi-employer bargaining as a member of the National Carriers’ Conference Committee, as well as local bargaining for agreements that are limited to KCSR's property. Approximately 71% of KCSR employees are covered by collective bargaining agreements. During 2022, 5-year agreements were reached voluntarily or through the legislation process covering all of the participating U.S. unions for the 2020 national bargaining round. KCSM union employees are covered by one labor agreement, which was signed on April 16, 2012, between KCSM Servicios S.A. de C.V., a previously wholly-owned subsidiary of KCS that was merged into KCSM in 2021, and the Sindicato de Trabajadores Ferrocarrileros de la República Mexicana (“Mexican Railroad Union”). Upon the merger between KCSM Servicios and KCSM, these union employees continue to be covered under this existing labor agreement, which remains in effect during the period of the Concession, for the purpose of regulating the relationship between the parties. Approximately 76% of KCSM employees are covered by this labor agreement.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Principles of Consolidation. The accompanying consolidated financial statements are presented using the accrual basis of accounting and include the Company and its majority-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. Certain prior year amounts have been reclassified to conform to the current year presentation. The equity method of accounting is used for all entities in which the Company or its subsidiaries have significant influence, but not a controlling interest. The Company evaluates less-than-majority-owned investments for consolidation pursuant to consolidation and variable interest entity guidance. The Company does not have any less-than-majority-owned investments requiring consolidation. In November 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2021-10, Government Assistance (Topic 832), Disclosures by Business Entities about Government Assistance. The standard is intended to increase transparency of government assistance by requiring disclosures of the following: (1) the types of assistance, (2) an entity’s accounting for the assistance, and (3) the effect of the assistance on the entity’s financial statements. This ASU was effective for the Company on January 1, 2022 and the Company adopted the ASU prospectively. See Note 7, Property and Equipment for the newly required disclosure. Use of Estimates. The accounting and financial reporting policies of the Company conform to accounting principles generally accepted in the United States of America (“U.S. GAAP”). The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include those related to the recoverability and useful lives of assets and income taxes. Changes in facts and circumstances may result in revised estimates and actual results could differ from those estimates. Revenue Recognition. The primary performance obligation for the Company is to move customers’ freight from an origin to a destination. A performance obligation is created when a customer under a transportation contract or public tariff submits a bill of lading for the transport of goods. The Company recognizes revenue proportionally as a shipment moves from origin to destination, using the distance shipped to measure progress, as the customer simultaneously receives and consumes the benefit over time. Related expenses are recognized as incurred. Revenue associated with in-transit shipments at period end is recognized based on the distance shipped as of the balance sheet date. Payment is received at the time or shortly after the performance obligation is satisfied. The transaction price is generally in the form of a fixed fee determined at the inception of the transportation contract or the inception of the bill of lading. Certain customer agreements have variable consideration that are based on milestone achievements in the form of rebates, discounts or incentives. The Company makes judgments to determine whether the variable consideration is probable of occurring and should be included in the estimated transaction price at the beginning of the period to apply a more consistent rate throughout the year based on an analysis of historical experience with the customer, forecasted shipments and other economic indicators. The Company adjusts the estimate on a quarterly basis. Other revenues, including switching, storage, and demurrage are distinct services and are recognized as services are performed or as contractual obligations are fulfilled. The consideration for other revenue is allocated between the separate services based upon the stand-alone transaction price. Foreign Exchange Gain (Loss). For financial reporting purposes, foreign subsidiaries maintain records in U.S. dollars, which is the functional currency. The dollar is the currency that reflects the economic substance of the underlying events and circumstances relevant to the entity. Monetary assets and liabilities denominated in Mexican pesos (“pesos” or “Ps.”) are remeasured into U.S. dollars (“dollars”) using current exchange rates. The difference between the exchange rate on the date of the transaction and the exchange rate on the settlement date, or balance sheet date if not settled, is included in the income statement as foreign exchange gain or loss. Cash Equivalents. Short-term liquid investments with an initial maturity of three months or less are classified as cash and cash equivalents. Accounts Receivable, net. Accounts receivable are net of an allowance for uncollectible accounts as determined by historical experience and adjusted for economic uncertainties, known trends, and reasonable supportable forecasts. Accounts are charged to the allowance when a customer enters bankruptcy, when an account has been transferred to a collection agent or submitted for legal action, or when a customer is significantly past due and all available means of collection have been exhausted. At December 31, 2022 and 2021, the allowance for estimated credit losses was $12.2 million and $12.1 million, respectively. For the years ended December 31, 2022, 2021 and 2020, bad debt expense was $8.7 million, $3.3 million and $1.5 million, respectively. Materials and Supplies. Materials and supplies consisting of diesel fuel, items to be used in the maintenance of rolling stock and items to be used in the maintenance or construction of road property are valued at the lower of average cost or net realizable value. Derivative Instruments. Derivatives are measured at fair value and recorded on the balance sheet as either assets or liabilities. Changes in the fair value of derivatives are recorded either through current earnings or as other comprehensive income (loss), depending on hedge designation. Gains and losses on derivative instruments classified as cash flow hedges are reported in other comprehensive income (loss) and are reclassified into earnings in the periods in which earnings are impacted by the variability of the cash flow of the hedged item. Property and Equipment (including Concession Assets). KCS capitalizes costs for self-constructed additions and improvements to property including direct labor and material, indirect costs, and interest during long-term construction projects. For purchased assets, all costs necessary to make the asset ready for its intended use are capitalized. Expenditures that significantly increase asset values, productive capacity, efficiency, safety or extend useful lives are capitalized. Repair and maintenance costs are expensed as incurred. The Company has a process to determine which costs qualify for capitalization, which requires judgment. KCS capitalizes certain costs incurred with developing or obtaining internal-use software. Costs incurred during the preliminary project and post-implementation stage, as well as maintenance and training costs are expensed as incurred. Property and equipment are carried at cost and are depreciated primarily on the group method of depreciation, which the Company believes closely approximates a straight line basis over the estimated useful lives of the assets measured in years. The group method of depreciation applies a composite rate to classes of similar assets rather than to individual assets. Composite depreciation rates are based upon the Company’s estimates of the expected average useful lives of assets as well as expected net salvage value at the end of their useful lives. In developing these estimates, the Company utilizes periodic depreciation studies performed by an independent engineering firm. Depreciation rate studies are performed at least every three years for equipment and at least six years for road property (rail, ties, ballast, etc.). The Company completed depreciation studies for KCSR in 2021 and KCSM in 2020. The impact of the KCSR study resulted in approximately $12.0 million in additional depreciation expense in 2022. The impact of the KCSM study was immaterial to the consolidated financial results for all periods presented. Under the group method of depreciation, the cost of railroad property and equipment (net of salvage or sales proceeds) retired or replaced in the normal course of business is charged to accumulated depreciation with no gain or loss recognized. Gains or losses on dispositions of land or non-group property and abnormal retirements of railroad property are recognized through income. A retirement of railroad property would be considered abnormal if the cause of the retirement is unusual in nature, is significant in amount, and varies significantly from the retirement profile identified through the depreciation studies. Costs incurred by the Company to acquire the Concession rights and related assets, as well as subsequent improvements to the Concession assets, are capitalized and amortized using the group method of depreciation over the lesser of the current expected Concession term, including probable renewal of an additional 50-year term, or the estimated useful lives of the assets and rights. .Impairment of Long-Lived Assets. Long-lived assets, including property and equipment, operating lease right-of-use assets and intangible assets with finite lives are reviewed for impairment and written down to fair value when events or circumstances indicate that the carrying amount of a long-lived asset or asset group may not be recoverable. If impairment indicators are present and the estimated future undiscounted cash flows are less than the carrying value of the long-lived assets, the carrying value would be reduced to the estimated fair value. Future cash flow estimates for an impairment review would be based on the lowest level of identifiable cash flows, which are the Company’s U.S. and Mexican operations. During the year ended December 31, 2020, $13.6 million of expense was recognized related to costs previously capitalized for the development of internal-use software. The development of the software was cancelled prior to completion and had no further use. Other than the abnormal impairment related to the implementation of Precision Scheduled Railroading (“PSR”) for the year ended 2020, and the aforementioned software impairment, management did not identify any indicators of impairment for the years ended December 31, 2022, 2021 and 2020. Leases. The Company leases transportation equipment, as well as office and other operating facilities, under various finance and operating leases. Operating lease right-of-use assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As the implicit rate is not readily determinable in most of the Company’s lease agreements, the Company uses its estimated secured incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Lease expense is recognized on a straight-line basis over the lease term. The Company determines if an arrangement is a lease or contains a lease at inception. The Company’s leases have remaining lease terms of approximately 1 year to 7 years, which may include the option to extend the lease when it is reasonably certain the Company will exercise that option. The Company does not separately identify lease and nonlease components (i.e. maintenance costs) except for fleet vehicles and real estate. The Company does not have lease agreements with residual value guarantees, sale leaseback terms or material restrictive covenants. Additionally, short-term leases and leases with variable lease costs are immaterial, and the Company does not have any sublease arrangements. Goodwill. Goodwill represents the excess of the purchase price over the fair value of the net identifiable assets acquired in business combinations. As of December 31, 2022 and 2021, the goodwill balance was $13.2 million, which is included in other assets in the consolidated balance sheets. Goodwill is not amortized, but is reviewed at least annually, or more frequently as indicators warrant, for impairment. An impairment loss would be recognized to the extent that the carrying amount exceeds the reporting units’ fair values. The Company performed its annual impairment review for goodwill during the fourth quarter of 2022 and 2021, and concluded there was no impairment. Investments and Impairment. The Company reviews equity method investments for impairment whenever events or changes in circumstances indicate that the carrying amount of the investment may not be recoverable in accordance with generally accepted accounting principles. This determination requires significant judgment. In making this judgment, the Company considers available quantitative and qualitative evidence in evaluating potential impairment of these investments. If it is determined that an indicator of impairment exists, the Company assesses whether the carrying value exceeds the fair value of the asset. If the carrying value of the investment exceeds its fair value, the Company will evaluate, among other factors, general market conditions, the duration and extent to which the carrying value is greater than the fair value, and KCS’s intent and ability to hold, or plans to sell, the investment. The Company also considers specific adverse conditions related to the financial health of and business outlook for the investee, including industry and sector performance, changes in technology, and operational and financing cash flow factors. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded and a new carrying basis in the investment is established. No impairment charges were recognized during the years ended December 31, 2022, 2021 and 2020. Fair Value of Financial Instruments. Non-financial assets and liabilities are recognized at fair value on a nonrecurring basis. These assets and liabilities are measured at fair value on an ongoing basis but are subject to recognition in the financial statements only in certain circumstances. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company determines the fair values of its financial instruments based on the fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The hierarchy is broken down into three levels based upon the observability of inputs. Fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access. Level 2 inputs include quoted prices for similar assets and liabilities in active markets, and inputs other than quoted prices that are observable for the asset or liability. Level 3 inputs are unobservable inputs for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value in its entirety requires judgment and considers factors specific to the asset or liability. Environmental Liabilities. The Company recognizes liabilities for remediation and restoration costs when the Company’s obligation is probable and the costs can be reasonably estimated. Costs of future expenditures for environmental remediation and restoration are not discounted to their present value. Recoveries of environmental remediation costs from other parties are recorded as assets when their receipt is deemed probable. Costs of ongoing compliance activities related to current operations are expensed as incurred. Personal Injury Claims. Personal injury claims in excess of self-insurance levels are insured up to certain coverage amounts, depending on the type of claim and year of occurrence. The Company’s personal injury liability is based on actuarial studies performed on an undiscounted basis by an independent third party actuarial firm and reviewed by management. The liability is based on claims filed and an estimate of claims incurred but not yet reported. Adjustments to the liability are reflected as operating expenses in the period in which the adjustments are known. Legal fees related to personal injury claims are recognized in operating expense in the period incurred. Health and Welfare and Postemployment Benefits. The Company provides certain medical, life and other postemployment benefits to certain active employees and retirees. The Company uses actuaries to assist management in measuring the benefit obligation and cost based on the current plan provisions, employee demographics, and assumptions about financial and demographic factors affecting the probability, timing and amount of expected future benefit payments. Significant assumptions include the discount rate, rate of increase in compensation levels, and the health care cost trend rate. Actuarial gains and losses determined at the measurement date (December 31) are recognized immediately in the consolidated statements of income. Share-Based Compensation. The Company accounted for all share-based compensation in accordance with fair value recognition provisions. Under this method, compensation expense was measured at grant date fair value and recognized over the requisite service period in which the award was earned. Forfeitures were recognized as they occurred. The Company had historically issued treasury stock to settle share-based awards. Income Taxes. Deferred income tax effects of transactions reported in different periods for financial reporting and income tax return purposes are recognized under the asset and liability method of accounting for income taxes. This method gives consideration to the future tax consequences of the deferred income tax items and immediately recognizes changes in income tax laws in the year of enactment. The Company has recognized a deferred tax asset, net of a valuation allowance, for net operating loss and capital loss carryovers. The Company projects sufficient future taxable income to realize the deferred tax asset recorded less the valuation allowance. These projections take into consideration assumptions about future income, future capital expenditures and inflation rates. If assumptions or actual conditions change, the deferred tax asset, net of the valuation allowance, will be adjusted to properly reflect the expected tax benefit.

Merger Agreement

Merger Agreement	12 Months Ended
	Dec. 31, 2022
Business Combinations [Abstract]
Merger Agreement	Merger Agreement On September 15, 2021, KCS and CP entered into a merger agreement (the “Merger Agreement”) and on December 14, 2021, CP acquired the outstanding common and preferred stock of KCS. Each share of common stock, par value $0.01 per share, of KCS that was outstanding immediately prior to the merger was converted into the right to receive (1) 2.884 common shares of CP and (2) $90 in cash (together, the “Merger Consideration”), and each share of preferred stock, par value $25 per share, that was outstanding immediately prior to the merger was converted into the right to receive $37.50 in cash. The Merger Consideration value received by KCS stockholders was $301.20 per KCS common share. The merger transaction was completed through a series of mergers as outlined in the Merger Agreement. These mergers ultimately resulted in KCS being merged with and into Cygnus Merger Sub 1 Corporation (“Surviving Merger Sub”), a wholly owned subsidiary of CP, with Surviving Merger Sub continuing as the surviving entity. Pursuant to the Merger Agreement, Surviving Merger Sub was renamed “Kansas City Southern” and as successor company of KCS, continued to own the assets of KCS. Immediately following the consummation of the mergers, CP caused the contribution, directly and indirectly, of all of the outstanding shares of capital stock of Surviving Merger Sub, as successor to KCS, to be deposited into an independent, irrevocable voting trust (the “Voting Trust”) under a voting trust agreement (the “Voting Trust Agreement”) approved by the U.S. Surface Transportation Board (“STB”), pending receipt of the final and non-appealable approval or exemption by the STB pursuant to 49 U.S.C. § 11323 et seq., of the transactions contemplated by the Merger Agreement (“STB Final Approval”). The Voting Trust prevents CP, or any affiliate of CP, from controlling or having the power to control KCS prior to STB Final Approval. Following receipt of STB Final Approval, the Voting Trust will be terminated and CP will acquire control over KCS’s railroad operations. STB Final Approval is expected to be granted in the first quarter of 2023, subject to the regulatory review process. On December 14, 2021, the merger of KCS and Surviving Merger Sub was accounted for as a recapitalization of KCS’s equity. Upon STB Final Approval, the transaction will be accounted for as a business combination using the acquisition method of accounting. See more details regarding the recapitalization in Item 8, Financial Statements and Supplementary Data — Note 14, Stockholder(s)’ Equity. Pursuant to the Merger Agreement, periodic cash distributions may be made to a wholly-owned subsidiary of CP based upon cash generated, the timing of capital expenditures and working capital needs of the Company. During 2022, KCS paid cash dividends of $880.0 million to a wholly-owned subsidiary of CP.

Restructuring Charges

Restructuring Charges	12 Months Ended
	Dec. 31, 2022
Restructuring and Related Activities [Abstract]
Restructuring Charges	Restructuring ChargesAs revenues declined in the second quarter of 2020 due to the novel coronavirus and its variants (“COVID-19”), the Company implemented a variety of cost-saving measures and accelerated Precision Scheduled Railroading (“PSR”) initiatives. In June of 2020, the Company offered a voluntary separation program, which resulted in a restructuring charge of $9.7 million for the year ended December 31, 2020, consisting of severance and benefit costs.During 2020, the Company recognized approximately $7.3 million in additional restructuring charges related to PSR and the purchase and disposal of equipment.

Leases

Leases	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Lessee, Operating Leases	Leases Leases Classification December 31, 2022 December 31, 2021 Assets (in millions) Operating Operating lease right-of-use assets $ 100.9 $ 69.6 Finance Property and equipment (including Concession assets), net 17.8 13.9 Total leased assets $ 118.7 $ 83.5 Liabilities Current Operating Accounts payable and accrued liabilities $ 28.8 $ 22.3 Finance Long-term debt due within one year 6.3 4.5 Noncurrent Operating Long-term operating lease liabilities 71.5 46.4 Finance Long-term debt 12.4 10.9 Total lease liabilities $ 119.0 $ 84.1 Years ended Lease Cost Classification December 31, 2022 December 31, 2021 December 31, 2020 Operating lease cost: (in millions) Equipment costs $ 20.8 $ 19.6 $ 23.3 Materials and other 5.7 5.8 5.0 Finance lease cost: Amortization of finance lease assets Depreciation and amortization 2.8 1.7 1.6 Interest on lease liabilities Interest expense 0.6 0.6 0.9 Total lease cost $ 29.9 $ 27.7 $ 30.8 Years ended Cash Flow Information December 31, 2022 December 31, 2021 December 31, 2020 (in millions) Cash paid for operating leases included in operating activities $ 32.5 $ 29.4 $ 45.6 Cash paid for finance leases included in operating activities 0.7 0.8 0.9 Cash paid for finance leases included in financing activities 5.9 3.5 2.0 Right-of-use assets obtained in exchange for operating lease liabilities 58.9 32.9 18.4 Right-of-use assets obtained in exchange for financing lease liabilities 9.2 11.5 0.8 Lease Term and Discount Rate December 31, 2022 December 31, 2021 Weighted-average remaining lease term (years) Operating leases 4.2 4.2 Finance leases 3.6 3.8 Weighted-average discount rate Operating leases 2.9 % 2.2 % Finance leases 3.5 % 5.1 % Remaining Maturities of Lease Liabilities Year Ending December 31 ( in millions ), Operating Leases Finance Leases 2023 $ 29.7 $ 6.8 2024 25.6 4.5 2025 18.9 4.2 2026 17.0 3.6 2027 9.5 0.4 Thereafter 3.5 — Total lease payments 104.2 19.5 Less imputed interest 3.9 0.8 Total $ 100.3 $ 18.7
Lessee, Finance Leases	Leases Leases Classification December 31, 2022 December 31, 2021 Assets (in millions) Operating Operating lease right-of-use assets $ 100.9 $ 69.6 Finance Property and equipment (including Concession assets), net 17.8 13.9 Total leased assets $ 118.7 $ 83.5 Liabilities Current Operating Accounts payable and accrued liabilities $ 28.8 $ 22.3 Finance Long-term debt due within one year 6.3 4.5 Noncurrent Operating Long-term operating lease liabilities 71.5 46.4 Finance Long-term debt 12.4 10.9 Total lease liabilities $ 119.0 $ 84.1 Years ended Lease Cost Classification December 31, 2022 December 31, 2021 December 31, 2020 Operating lease cost: (in millions) Equipment costs $ 20.8 $ 19.6 $ 23.3 Materials and other 5.7 5.8 5.0 Finance lease cost: Amortization of finance lease assets Depreciation and amortization 2.8 1.7 1.6 Interest on lease liabilities Interest expense 0.6 0.6 0.9 Total lease cost $ 29.9 $ 27.7 $ 30.8 Years ended Cash Flow Information December 31, 2022 December 31, 2021 December 31, 2020 (in millions) Cash paid for operating leases included in operating activities $ 32.5 $ 29.4 $ 45.6 Cash paid for finance leases included in operating activities 0.7 0.8 0.9 Cash paid for finance leases included in financing activities 5.9 3.5 2.0 Right-of-use assets obtained in exchange for operating lease liabilities 58.9 32.9 18.4 Right-of-use assets obtained in exchange for financing lease liabilities 9.2 11.5 0.8 Lease Term and Discount Rate December 31, 2022 December 31, 2021 Weighted-average remaining lease term (years) Operating leases 4.2 4.2 Finance leases 3.6 3.8 Weighted-average discount rate Operating leases 2.9 % 2.2 % Finance leases 3.5 % 5.1 % Remaining Maturities of Lease Liabilities Year Ending December 31 ( in millions ), Operating Leases Finance Leases 2023 $ 29.7 $ 6.8 2024 25.6 4.5 2025 18.9 4.2 2026 17.0 3.6 2027 9.5 0.4 Thereafter 3.5 — Total lease payments 104.2 19.5 Less imputed interest 3.9 0.8 Total $ 100.3 $ 18.7

Revenue

Revenue	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Disaggregation of Revenue The following table presents revenues disaggregated by the major commodity groups as well as the product types included within the major commodity groups (in millions) . The Company believes disaggregation by product type best depicts how cash flows are affected by economic factors. See Note 18, Geographic Information in the consolidated financial statements for revenues by geographical area. Years ended December 31, 2022 2021 2020 Chemical & Petroleum Chemicals $ 291.9 $ 263.5 $ 236.7 Petroleum 324.8 442.1 375.0 Plastics 166.8 146.2 152.1 Total 783.5 851.8 763.8 Industrial & Consumer Products Forest Products 295.8 261.8 247.8 Metals & Scrap 257.3 204.9 188.4 Other 157.5 122.9 101.5 Total 710.6 589.6 537.7 Agriculture & Minerals Grain 432.5 358.6 299.6 Food Products 175.1 152.3 154.6 Ores & Minerals 33.5 25.9 21.8 Stone, Clay & Glass 40.9 34.9 29.4 Total 682.0 571.7 505.4 Energy Utility Coal 165.3 148.5 105.6 Coal & Petroleum Coke 49.2 47.3 41.8 Frac Sand 18.3 15.6 11.3 Crude Oil 72.4 43.4 36.3 Total 305.2 254.8 195.0 Intermodal 449.7 346.3 319.1 Automotive 258.4 183.2 172.7 Total Freight Revenues 3,189.4 2,797.4 2,493.7 Other Revenue 181.0 149.9 138.9 Total Revenues $ 3,370.4 $ 2,947.3 $ 2,632.6 Major customers No individual customer makes up greater than 10% of total consolidated revenues. Contract Balances The amount of revenue recognized in 2022 from performance obligations partially satisfied in the previous year was $17.9 million. The performance obligations that were unsatisfied or partially satisfied as of December 31, 2022, were $25.8 million, which represents in-transit shipments that are fully satisfied the following month. A receivable is any unconditional right to consideration, and is recognized as shipments have been completed and the relating performance obligation has been fully satisfied. At December 31, 2022 and 2021, the accounts receivable, net balance was $543.6 million and $271.0 million, respectively. Contract assets represent a conditional right to consideration in exchange for goods or services. The Company did not have any contract assets at December 31, 2022 and 2021. Contract liabilities represent consideration received in advance from customers, and are recognized as revenue over time as the relating performance obligation is satisfied. The amount of revenue recognized in 2022 that was included in the opening contract liability balance was $34.1 million. The Company has recognized contract liabilities within the accounts payable and accrued liabilities and other long-term liabilities financial statement captions on the balance sheet. The following tables summarize the changes in contract liabilities (in millions) : Contract liabilities Years ended December 31, 2022 2021 Beginning balance $ 68.4 $ 29.9 Revenue recognized that was included in the contract liability balance at the beginning of the period (34.1) (29.7) Increases due to consideration received, excluding amounts recognized as revenue during the period 29.8 68.2 Ending balance $ 64.1 $ 68.4

Property and Equipment (includi

Property and Equipment (including Concession Assets)	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property and Equipment (including Concession Assets)	Property and Equipment (including Concession Assets) The following tables list the major categories of property and equipment, including Concession assets, as well as the weighted-average composite depreciation rate for each category ( in millions ): As of December 31, 2022 Cost Accumulated Net Book Depreciation Land $ 244.7 $ — $ 244.7 N/A Concession land rights 141.1 (33.6) 107.5 1.0 % Rail and other track material 2,394.8 (454.3) 1,940.5 1.9-3.6% Ties 1,868.0 (475.8) 1,392.2 1.4-5.4% Grading 1,013.1 (210.8) 802.3 1.0 % Bridges and tunnels 940.8 (192.3) 748.5 1.3 % Ballast 940.2 (277.8) 662.4 2.2-4.4% Other (a) 1,652.5 (567.7) 1,084.8 3.0 % Total road property 8,809.4 (2,178.7) 6,630.7 2.7 % Locomotives 1,826.2 (637.0) 1,189.2 5.0 % Freight cars 995.0 (266.4) 728.6 2.9 % Other equipment 83.0 (41.1) 41.9 5.2 % Total equipment 2,904.2 (944.5) 1,959.7 4.3 % Technology and other 453.7 (335.6) 118.1 10.9 % Construction in progress 301.7 — 301.7 N/A Total property and equipment (including Concession assets) $ 12,854.8 $ (3,492.4) $ 9,362.4 N/A _____________ (a) Other includes signals, buildings and other road assets. As of December 31, 2021 Cost Accumulated Net Book Depreciation Land $ 243.0 $ — $ 243.0 N/A Concession land rights 141.1 (32.2) 108.9 1.0 % Rail and other track material 2,240.6 (417.7) 1,822.9 1.8-3.6% Ties 1,790.0 (435.6) 1,354.4 1.4-5.4% Grading 1,006.8 (200.3) 806.5 1.0 % Bridges and tunnels 884.1 (181.0) 703.1 1.3 % Ballast 898.6 (258.2) 640.4 2.2-4.4% Other (a) 1,610.5 (519.6) 1,090.9 2.7 % Total road property 8,430.6 (2,012.4) 6,418.2 2.6 % Locomotives 1,777.2 (546.6) 1,230.6 4.5 % Freight cars 974.2 (234.4) 739.8 2.2 % Other equipment 91.0 (39.9) 51.1 5.0 % Total equipment 2,842.4 (820.9) 2,021.5 3.7 % Technology and other 372.6 (290.7) 81.9 15.6 % Construction in progress 335.8 — 335.8 N/A Total property and equipment (including Concession assets) $ 12,365.5 $ (3,156.2) $ 9,209.3 N/A _____________ (a) Other includes signals, buildings and other road assets. Concession assets, net of accumulated amortization of $797.3 million and $744.8 million, totaled $2,472.0 million and $2,459.3 million at December 31, 2022 and 2021, respectively. Depreciation and amortization of property and equipment (including Concession assets) totaled $390.9 million, $365.8 million and $357.9 million, for 2022, 2021, and 2020, respectively. The Company has historically received assistance from governmental entities, typically in the form of cash, for purposes of making improvements to its rail network as part of public safety and/or economic revitalization initiatives. The governmental entity generally specifies how the monetary assistance is to be spent, and may include limited conditions requiring the Company to return the assistance. The Company accounts for this assistance received as reductions to property and equipment in the period in which the improvement is made, with the assistance being amortized as an offset to depreciation expense over the life of the improvement. As of December 31, 2022 and 2021, the total governmental assistance received, net of accumulated amortization, was $34.8 million and $37.3 million, respectively. For the year ended December 31, 2022, governmental assistance amortization was $2.5 million. In 2020, $13.6 million of expense was recognized related to costs previously capitalized for the development of internal-use software. The development of the software was cancelled prior to completion and had no further use. The expense was recognized in write-off of software development costs in the consolidated statements of income.

Other Balance Sheet Captions

Other Balance Sheet Captions	12 Months Ended
	Dec. 31, 2022
Other Balance Sheet Captions [Abstract]
Other Balance Sheet Captions	Other Balance Sheet Captions Other Current Assets. Other current assets included the following items at December 31 (in millions): 2022 2021 Prepaid expenses $ 28.4 $ 25.8 Refundable Mexican value added tax 78.9 78.0 Prepaid income taxes 14.3 19.0 Advances to affiliates 8.8 9.0 Other 8.4 10.3 Other current assets $ 138.8 $ 142.1 Accounts Payable and Accrued Liabilities. Accounts payable and accrued liabilities included the following items at December 31 (in millions): 2022 2021 Accounts payable $ 207.2 $ 169.7 Accrued wages and vacation 128.4 103.7 Accrued merger costs 55.8 37.3 Income and other taxes 41.9 37.0 Foreign currency forward contracts 41.0 1.8 Contract liabilities 31.3 30.0 Short-term operating lease liability 28.8 22.3 Interest payable 26.2 26.2 Derailments, personal injury and other claim provisions 25.1 27.5 Accrued rents and leases 13.3 7.7 Other 36.7 16.5 Accounts payable and accrued liabilities $ 635.7 $ 479.7

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company’s assets and liabilities recognized at fair value have been categorized based upon a fair value hierarchy as described in Note 2, Significant Accounting Policies. As of December 31, 2022 and 2021, the Company’s derivative financial instruments are measured at fair value on a recurring basis and consist of foreign currency forward contracts and treasury lock agreements, which are classified as Level 2 valuations. The Company determines the fair value of its derivative financial instrument positions based upon pricing models using inputs observed from actively quoted markets and also takes into consideration the contract terms as well as other inputs, including market currency exchange rates. The Company’s short-term financial instruments include cash and cash equivalents, accounts receivable, accounts payable and short-term borrowings. The carrying value of the short-term financial instruments approximates their fair value. The fair value of the Company’s debt is estimated using quoted market prices when available. When quoted market prices are not available, fair value is estimated based on current market interest rates for debt with similar maturities and credit quality. The carrying value of the Company’s debt was $3,779.6 million and $3,777.6 million at December 31, 2022 and 2021, respectively. If the Company’s debt were measured at fair value, the fair value measurements of the individual debt instruments would have been classified as Level 2 in the fair value hierarchy. The fair value of the Company’s financial instruments is presented in the following table (in millions) : December 31, 2022 December 31, 2021 Level 2 Level 2 Assets Treasury lock agreements $ — $ 57.4 Liabilities Debt instruments 3,308.3 4,311.1 Foreign currency derivative instruments 41.0 1.8

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments The Company enters into derivative transactions in certain situations based on management’s assessment of current market conditions and perceived risks. Management intends to respond to evolving business and market conditions and in doing so, may enter into such transactions as deemed appropriate. Credit Risk. As a result of the use of derivative instruments, the Company is exposed to counterparty credit risk. The Company manages this risk by limiting its counterparties to large financial institutions which meet the Company’s credit rating standards and have an established banking relationship with the Company. As of December 31, 2022, the Company did not expect any losses as a result of default of its counterparties. Interest Rate Derivative Instruments . During 2020, the Company executed six 30-year treasury lock agreements with an aggregate notional value of $650.0 million and a weighted-average interest rate of 1.58%. The purpose of the treasury locks was to hedge the U.S. Treasury benchmark interest rate associated with future interest payments related to the anticipated refinancing of the $444.7 million principal amount of 3.00% senior notes due May 15, 2023 (the “3.00% Senior Notes”) and the $200.0 million principal amount of 3.85% senior notes due November 15, 2023 (the “3.85% Senior Notes”). The Company designated the treasury locks as cash flow hedges and recorded unrealized gains and losses in accumulated other comprehensive income (loss). During the fourth quarter of 2022, KCS determined the forecasted refinancing of the 3.00% Senior Notes and the 3.85% Senior Notes was no longer considered probable to occur as financing costs have risen and the Company plans to extinguish the maturing debt with cash on hand and cash generated from operations. Accordingly, the Company removed the cash flow hedge designation to all tranches and derecognized the related unrealized gain in accumulated other comprehensive income (loss). The treasury lock instruments were settled and the Company recognized the gain on settlement of the interest rate derivative instruments of $259.3 million within the consolidated statements of income. The settlement of the treasury lock agreements was classified as an investing activity within the consolidated statements of cash flows. In May 2017, the Company executed four treasury lock agreements with an aggregate notional value of $275.0 million and a weighted-average interest rate of 2.85%. The purpose of the treasury locks was to hedge the U.S. Treasury benchmark interest rate associated with future interest payments related to the anticipated refinancing of the $275.0 million, 2.35% senior notes due May 15, 2020 (the “2.35% Senior Notes”). The Company designated the treasury locks as cash flow hedges and recorded unrealized gains and losses in accumulated other comprehensive income (loss). During the fourth quarter of 2019, KCS issued $425.0 million principal amount of 2.875% senior notes due November 15, 2029 (the “2.875% Senior Notes”), effectively completing the refinancing of the 2.35% Senior Notes, and settled the treasury lock agreements, resulting in cash paid of $25.8 million. This amount was included in accumulated other comprehensive income (loss) and is being amortized to interest expense over the life of the new 2.875% Senior Notes, increasing the effective interest rate on the notes to 3.60%. Foreign Currency Derivative Instruments. The Company’s Mexican subsidiaries have net U.S. dollar-denominated monetary assets which, for Mexican income tax purposes, are subject to periodic revaluation based on changes in the value of the Mexican peso against the U.S. dollar. This revaluation creates fluctuations in the Company’s Mexican income tax expense and the amount of income taxes paid in Mexico. The Company hedges its exposure to this cash tax risk by entering into foreign currency forward contracts, which involve the Company’s purchase of Mexican pesos and/or U.S. dollars at an agreed-upon weighted-average exchange rate to each U.S dollar or Mexican Peso. Below is a summary of the Company’s 2022, 2021 and 2020 foreign currency derivative contracts (amounts in millions, except Ps./USD) : Foreign currency forward contracts Contracts to sell Ps./receive USD Offsetting contracts to purchase Ps./pay USD Notional amount Notional amount Weighted-average exchange rate (in Ps./USD) Notional amount Notional amount Weighted-average exchange rate (in Ps./USD) Cash received/(paid) on settlement Contracts executed in 2022 and outstanding $ 535.0 Ps. 11,235.2 Ps. 21.0 — — — — Contracts executed in 2022 and settled in 2022 $ 110.0 Ps. 2,348.4 Ps. 21.3 $ 113.4 Ps. 2,348.4 Ps. 20.7 $ (3.4) Contracts executed in 2021 and settled in 2022 $ 270.0 Ps. 5,583.3 Ps. 20.7 $ 271.7 Ps. 5,583.3 Ps. 20.6 $ (1.7) Contracts executed in 2020 and settled in 2020 $ 75.0 Ps. 1,555.5 Ps. 20.7 $ 78.0 Ps. 1,555.5 Ps. 20.0 $ (2.9) Contracts to purchase Ps./pay USD Offsetting contracts to sell Ps./receive USD Notional amount Notional amount Weighted-average exchange rate (in Ps./USD) Notional amount Notional amount Weighted-average exchange rate (in Ps./USD) Cash received/(paid) on settlement Contracts executed in 2021 and settled in 2021 $ 100.0 Ps. 1,993.5 Ps. 19.9 $ 98.1 Ps. 1,993.5 Ps. 20.3 $ (1.9) Contracts executed in 2020 and settled in 2020 $ 555.0 Ps. 11,254.3 Ps. 20.3 $ 534.3 Ps. 11,254.3 Ps. 21.1 $ (20.7) Contracts executed in 2019 and settled in 2020 $ 105.0 Ps. 2,041.2 Ps. 19.4 $ 108.6 Ps. 2,041.2 Ps. 18.8 $ 3.6 The Company has not designated any of the foreign currency derivative contracts as hedging instruments for accounting purposes. The Company measures the foreign currency derivative contracts at fair value each period and recognizes any change in fair value in foreign exchange gain (loss) within the consolidated statements of income. The cash flows associated with these instruments is classified as an operating activity within the consolidated statements of cash flows. Offsetting. The Company’s treasury lock agreements and foreign currency forward contracts are executed with counterparties in the U.S. and are governed by International Swaps and Derivatives Association agreements that include standard netting arrangements. Asset and liability positions from contracts with the same counterparty are net settled upon maturity/expiration and presented on a net basis in the consolidated balance sheets prior to settlement. The following table presents the fair value of derivative instruments included in the consolidated balance sheets at December 31 (in millions) : Derivative Assets Balance Sheet Location 2022 2021 Derivatives designated as hedging instruments: Treasury lock agreements Other assets — $ 57.4 Total derivatives designated as hedging instruments — 57.4 Total derivative assets — $ 57.4 Derivative Liabilities Balance Sheet Location 2022 2021 Derivatives not designated as hedging instruments: Foreign currency forward contracts Accounts payable and accrued liabilities $ 41.0 $ 1.8 Total derivatives not designated as hedging instruments 41.0 1.8 Total derivative liabilities $ 41.0 $ 1.8 The following table summarizes the gross and net fair value of derivative liabilities (in millions) : As of December 31, 2022 Gross Liabilities Gross Net Amounts Presented in the Consolidated Balance Sheets Derivatives subject to a master netting arrangement or similar agreement $ 41.0 — $ 41.0 As of December 31, 2021 Derivatives subject to a master netting arrangement or similar agreement $ 2.8 $ (1.0) $ 1.8 The following tables present the effects of derivative instruments on the consolidated statements of income and consolidated statements of comprehensive income for the years ended December 31 (in millions) : Derivatives in Cash Flow Hedging Relationships Amount of Gain/(Loss) Recognized in OCI on Derivative Location of Gain/(Loss) Reclassified from AOCI into Income Amount of Gain/(Loss) Reclassified from AOCI into Income 2022 2021 2020 2022 2021 2020 Treasury lock agreements $ 201.9 $ 21.8 $ 35.6 Interest expense $ (2.4) $ (2.5) $ (2.4) Gain on settlement of treasury lock agreements 259.3 — — Total $ 201.9 $ 21.8 $ 35.6 $ 256.9 $ (2.5) $ (2.4) Derivatives Not Designated as Hedging Instruments Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Recognized in Income on Derivative 2022 2021 2020 Foreign currency forward contracts Foreign exchange loss $ (44.3) $ (3.7) $ (22.5) Total $ (44.3) $ (3.7) $ (22.5)

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Short-Term Borrowings	Short-Term Borrowings Commercial Paper. The Company’s commercial paper program generally serves as the primary means of short-term funding. As of December 31, 2022, and 2021, KCS had no commercial paper outstanding. For the years ended December 31, 2022, 2021 and 2020, commercial paper borrowings were outstanding for less than 90 days and the related activity is presented on a net basis in the consolidated statements of cash flows.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt at December 31 (in millions): 2022 2021 Principal Unamortized Discount and Debt Issuance Costs Net Principal Unamortized Discount and Debt Issuance Costs Net Revolving credit facilities, variable interest rate, due 2024 $ — $ — $ — $ — $ — $ — KCS 3.00% senior notes, due 2023 439.1 0.3 438.8 439.1 1.0 438.1 KCS 3.85% senior notes, due 2023 199.2 0.2 199.0 199.2 0.5 198.7 KCS 3.125% senior notes, due 2026 250.0 1.3 248.7 250.0 1.7 248.3 KCS 2.875% senior notes, due 2029 425.0 3.0 422.0 425.0 3.4 421.6 KCS 4.30% senior notes, due 2043 448.7 7.8 440.9 448.7 8.1 440.6 KCS 4.95% senior notes, due 2045 499.2 6.4 492.8 499.2 6.7 492.5 KCS 4.70% senior notes, due 2048 500.0 5.4 494.6 500.0 5.6 494.4 KCS 3.50% senior notes, due 2050 550.0 10.1 539.9 550.0 10.4 539.6 KCS 4.20% senior notes, due 2069 425.0 6.7 418.3 425.0 6.8 418.2 KCSR 3.85% to 4.95% senior notes, due through 2045 2.7 — 2.7 2.7 — 2.7 KCSM 3.00% senior notes, due 2023 5.6 — 5.6 5.6 — 5.6 RRIF loans 2.96% to 4.29%, due serially through 2037 57.7 0.3 57.4 62.0 0.3 61.7 Finance lease obligations, due serially to 2027 18.7 — 18.7 15.4 — 15.4 Other debt obligations 0.2 — 0.2 0.2 — 0.2 Total 3,821.1 41.5 3,779.6 3,822.1 44.5 3,777.6 Less: Debt due within one year 655.5 0.5 655.0 8.8 — 8.8 Long-term debt $ 3,165.6 $ 41.0 $ 3,124.6 $ 3,813.3 $ 44.5 $ 3,768.8 Revolving Credit Facility KCS, with certain of its domestic subsidiaries named therein as guarantors, has a $600.0 million senior unsecured revolving credit facility (the “Revolving Credit Facility”), with a $25.0 million standby letter of credit facility which, if utilized, constitutes usage under the Revolving Credit Facility. The Revolving Credit Facility serves as a backstop for KCS’s commercial paper program (the “Commercial Paper Program”) which generally serves as the Company’s primary means of short-term funding. Borrowings under the Revolving Credit Facility bear interest at floating rates. Depending on the Company’s credit rating, the margin that KCS would pay above the London Interbank Offered Rate (“LIBOR”) at any point is between 1.000% and 1.750%. As of December 31, 2022, the margin was 1.25% based on KCS’s current credit rating. The Revolving Credit Facility is guaranteed by KCSR, together with certain domestic subsidiaries named therein as guarantors and matures on March 8, 2024. The Revolving Credit Facility agreement contains representations, warranties, covenants and events of default that are customary for credit agreements of this type. The occurrence of an event of default could result in the termination of the commitments and the acceleration of the repayment of any outstanding principal balance on the Revolving Credit Facility and the Commercial Paper Program. As of December 31, 2022 and 2021, KCS had no outstanding borrowings under the revolving credit facility. Senior Notes The Company’s senior notes include certain covenants that are customary for these types of debt instruments issued by borrowers with similar credit ratings. The KCS notes are KCS’s general unsecured senior obligations and are unconditionally guaranteed, jointly and severally, on an unsecured senior basis by each current and future domestic subsidiary of KCS that from time to time guarantees the Revolving Credit Facility or any other debt of KCS or any of KCS’s significant subsidiaries that is a guarantor (collectively, the “Note Guarantors”). KCSR’s senior notes are unconditionally guaranteed, jointly and severally, on an unsecured senior basis, by KCS and each current and future domestic subsidiary of KCS that guarantees the Revolving Credit Facility or certain other debt of KCS or a note guarantor. KCSR’s senior notes and the note guarantees rank pari passu in right of payment with KCSR’s, KCS’s and the Note Guarantors’ existing and future unsecured, unsubordinated obligations. KCSM’s senior notes are denominated in U.S. dollars; are unsecured, unsubordinated obligations; rank pari passu in right of payment with KCSM’s existing and future unsecured, unsubordinated obligations and are senior in right of payment to KCSM’s future subordinated indebtedness. Senior notes are redeemable at the issuer’s option, in whole or in part, at any time, by paying the greater of either 100% of the principal amount to be redeemed and a formula price based on interest rates prevailing at the time of redemption and time remaining to maturity, plus, in each case, accrued interest thereon to, but excluding the redemption date. In addition, KCSM’s senior notes are redeemable, in whole but not in part, at KCSM’s option at any time at a redemption price of 100% of their principal amount, plus any accrued unpaid interest in the event of certain changes in the Mexican withholding tax rate. RRIF Loan Agreements The following loans were made under the Railroad Rehabilitation and Improvement Financing (“RRIF”) Program administered by the Federal Railroad Administration (“FRA”): KCSR RRIF Loan Agreement. On February 21, 2012, KCSR entered into an agreement with the FRA to borrow $54.6 million to be used to reimburse KCSR for a portion of the purchase price of thirty new locomotives (the “Locomotives”) acquired by KCSR in the fourth quarter of 2011. The loan bears interest at 2.96% annually and the principal balance amortizes quarterly with a final maturity of February 24, 2037. The obligations under the financing agreement are secured by a first priority security interest in the Locomotives and certain related rights. In addition, the Company has agreed to guarantee repayment of the amounts due under the financing agreement and certain related agreements. The occurrence of an event of default could result in the acceleration of the repayment of any outstanding principal balance of the loan. Tex-Mex RRIF Loan Agreement. On June 28, 2005, Tex-Mex entered into an agreement with the FRA to borrow $50.0 million to be used for infrastructure improvements in order to accommodate growing freight rail traffic related to the NAFTA corridor. The loan bears interest at 4.29% annually and the principal balance amortizes quarterly with a final maturity of July 13, 2030. The loan is guaranteed by Mexrail, which has issued a pledge agreement in favor of the lender equal to the gross revenues earned by Mexrail on per-car fees on traffic crossing the International Rail Bridge in Laredo, Texas. In addition, the Company has agreed to guarantee the scheduled principal payment installments due to the FRA from Tex-Mex under the loan agreement on a rolling five-year basis. Debt Covenants Compliance The Company was in compliance with all of its debt covenants as of December 31, 2022. Other Debt Provisions Certain loan agreements and debt instruments entered into or guaranteed by the Company and its subsidiaries provide for default in the event of a specified change in control of the Company or particular subsidiaries of the Company. Debt Maturities Minimum annual payments for debt maturities are as follows (in millions) : Years Long-Term Debt Net Present Value Finance Leases Total 2023 $ 649.2 $ 6.3 $ 655.5 2024 4.6 4.3 8.9 2025 5.0 4.1 9.1 2026 255.0 3.6 258.6 2027 5.2 0.4 5.6 Thereafter 2,883.4 — 2,883.4 Total $ 3,802.4 $ 18.7 $ 3,821.1

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Current income tax expense represents the amounts expected to be reported on the Company’s income tax returns, and deferred tax expense or benefit represents the change in net deferred tax assets and liabilities. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets and liabilities as measured by the enacted tax rates that will be in effect when these differences reverse. Valuation allowances are recorded as appropriate to reduce deferred tax assets to the amount considered likely to be realized. Tax Expense. Income tax expense consists of the following components (in millions): 2022 2021 2020 Current: Federal $ 88.4 $ 18.1 $ (1.9) State and local 8.2 2.7 1.6 Foreign 194.3 167.1 155.0 Total current 290.9 187.9 154.7 Deferred: Federal 52.7 21.2 49.4 State and local (3.3) (1.6) 13.8 Foreign (14.4) 3.6 (13.8) Total deferred 35.0 23.2 49.4 Total income tax expense $ 325.9 $ 211.1 $ 204.1 Income before income taxes consists of the following (in millions) : 2022 2021 2020 Income before income taxes: U.S. $ 662.1 $ 148.6 $ 329.0 Foreign 647.6 589.5 494.2 Total income before income taxes $ 1,309.7 $ 738.1 $ 823.2 The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31 follow (in millions): 2022 2021 Assets: Reserves not currently deductible for tax $ 65.5 $ 42.5 Compensation and benefits 32.0 28.0 Lease liability 26.9 19.4 Tax credit and loss carryovers 14.8 26.4 Other 26.5 6.5 Gross deferred tax assets before valuation allowance 165.7 122.8 Valuation allowance (2.1) (7.3) Net deferred tax assets 163.6 115.5 Liabilities: Property (1,317.1) (1,253.0) Investments (57.9) (56.0) Other (25.7) (20.2) Gross deferred tax liabilities (1,400.7) (1,329.2) Net deferred tax liability $ (1,237.1) $ (1,213.7) Tax Rates. Differences between the Company’s effective income tax rate and the U.S. federal statutory income tax rate of 21% follow (in millions): 2022 2021 2020 Dollars Percent Dollars Percent Dollars Percent Income tax expense using the statutory rate in effect $ 275.0 21.0 % $ 155.0 21.0 % $ 172.9 21.0 % Tax effect of: Difference between U.S. and foreign tax rate 57.4 4.4 % 51.9 7.0 % 44.1 5.4 % Inflation (25.8) (2.0 %) (10.4) (1.4 %) (4.9) (0.6 %) Tax credits (11.9) (0.9 %) (11.7) (1.6 %) (13.8) (1.7 %) Foreign exchange (i) 9.4 0.7 % 5.9 0.8 % (3.4) (0.4 %) State and local income tax provision, net 9.1 0.7 % 0.2 — 12.5 1.5 % Withholding tax 8.5 0.6 % 8.5 1.2 % 9.9 1.2 % Non-deductible executive compensation 3.6 0.3 % 14.7 2.0 % 1.8 0.2 % Non-deductible transaction costs 0.6 — 14.0 1.9 % — — Global intangible low-taxed income tax, net 0.1 — 0.4 0.1 % (14.5) (1.8 %) Share-based compensation — — (25.2) (3.4 %) (4.6) (0.6 %) Other, net (0.1) 0.1 % 7.8 1.0 % 4.1 0.6 % Income tax expense $ 325.9 24.9 % $ 211.1 28.6 % $ 204.1 24.8 % _____________________ (i) The Company’s Mexican subsidiaries have net U.S. dollar-denominated monetary assets which, for Mexican income tax purposes, are subject to periodic revaluation based on changes in the value of the Mexican peso against the U.S. dollar. This revaluation creates fluctuations in the Company’s Mexican income tax expense in the consolidated statements of income and the amount of income taxes paid in Mexico. The Company also has net monetary assets denominated in Mexican pesos, that are subject to periodic re-measurement and settlement that creates fluctuations in foreign currency gains and losses in the consolidated statements of income. The Company hedges its net exposure to variations in earnings by entering into foreign currency forward contracts. The foreign currency forward contracts involve the Company’s agreement to buy or sell pesos at an agreed-upon exchange rate on a future date. Refer to Note 10, Derivative Instruments for further information. Difference Attributable to Foreign Investments. The Company asserts that all foreign earnings will be indefinitely reinvested to the extent of local needs and earnings that would be distributed in a taxable manner. The Company therefore intends to limit distributions to earnings previously taxed in the U.S., or earnings that would qualify for the 100 percent dividends received deduction and earnings that would not result in any significant foreign taxes. Therefore, the Company has not recognized a deferred tax liability on its investment in foreign subsidiaries. Tax Carryovers. The Company has U.S. state net operating losses which are carried forward from 10 years to indefinitely and are analyzed each year to determine the likelihood of realization. The state loss carryovers arise from both combined and separate tax filings from as early as 2001 and may expire as early as December 31, 2023. The state loss carryover at December 31, 2022 was $64.9 million resulting in a state deferred tax asset of $7.2 million. The Mexico federal loss carryovers at December 31, 2022, were $27.0 million resulting in a net deferred tax asset of $7.9 million, and, if not used, will begin to expire in 2026. A deferred tax asset was recognized in prior periods for the expected future tax benefit of these losses which will be carried forward to reduce only Mexican income tax payable in future years. The valuation allowance for deferred tax assets as of December 31, 2022 and 2021, was $2.1 million and $7.3 million, respectively, primarily attributable to state net operating loss and capital loss carryovers. The Company believes it is more likely than not that reversals of existing temporary differences that will produce future taxable income and the results of future operations will generate sufficient taxable income to realize the deferred tax assets, net of valuation allowances, related to loss carryovers. Uncertain Tax Positions. The accounting guidance for uncertainty in income taxes prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The guidance requires the Company to recognize in the consolidated financial statements the benefit of a tax position only if the impact is more likely than not of being sustained on audit based on the technical merits of the position. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows ( in millions ): 2022 2021 Balance at January 1, $ 2.2 $ 2.2 Additions for tax positions of prior years 1.3 — Reductions for settlement with taxing authorities (2.2) — Balance at December 31, $ 1.3 $ 2.2 The unrecognized tax benefit would affect the effective income tax rate if recognized, and is not expected to change in the next twelve months. Interest, inflation and penalties related to uncertain tax positions are included in income before taxes on the consolidated statements of income. Accrued interest, inflation and penalties on unrecognized tax benefits was $2.6 million and $0.1 million at December 31, 2022 and 2021, respectively. Interest, inflation and penalty expense was $2.6 million and less than $0.1 million for 2022 and 2021, respectively. Tax Contingencies . Tax returns filed in the U.S. for periods after 2017 and in Mexico for periods after 2014 remain open to examination by the taxing authority. The Internal Revenue Service (“IRS”) has completed its examination of the 2017 deemed mandatory repatriation tax included in the 2017 U.S. federal tax return and the 2016 U.S. federal tax return with no material impact to the consolidated financial statements. The Servicio de Administración Tributaria (“SAT”), the Mexican equivalent of the IRS, has initiated examinations of the KCSM 2015 through 2020 Mexico tax returns and the Financiera Inspira, S.A. de C.V. SOFOM, E.N.R. 2016 and 2017 Mexico tax returns. The Company does not expect that these examinations will have a material impact on the consolidated financial statements. During 2017, the Company received audit assessments from the SAT for the KCSM 2009 and 2010 Mexico tax returns. The Company commenced administrative actions with the SAT and the audit assessments were subsequently nullified. In the third quarter of 2018, the SAT issued new assessments and the Company filed administrative appeals with the SAT. During the first quarter of 2022, the Company received an audit assessment from the SAT for the KCSM 2013 Mexico tax return and filed an administrative appeal of the assessment in the second quarter of 2022. On April 13, 2022, the SAT used an electronic tax mailbox to deliver an audit assessment on the 2014 KCSM tax returns, which as of December 31, 2022 was Ps.5.7 billion (approximately $296.0 million USD) of tax, interest, penalties and inflation (the “2014 Audit Assessment”). In 2014, KCSM filed an amparo lawsuit with the district court, objecting to the SAT’s electronic accounting requirements, including the SAT’s use of the electronic tax mailbox, and KCSM was granted a permanent injunction in 2015 preventing the SAT from delivering any notification of assessments using the electronic tax mailbox. The permanent injunction remained in effect through the date the SAT issued the 2014 Audit Assessment. The Company became aware of the 2014 Audit Assessment on June 30, 2022 and based on the permanent injunction on the electronic accounting requirements, the Company believed it had thirty business days from that date to file an appeal. On July 7, 2022, the Company filed an administrative appeal of the 2014 Audit Assessment with the SAT. During the third quarter of 2022, the SAT dismissed the administrative appeal of the 2014 Audit Assessment on the basis it wasn’t filed timely. During the fourth quarter of 2022, the Company filed a nullification lawsuit in Mexican court challenging the SAT dismissal of the administrative appeal of the 2014 Audit Assessment. The Company believes that it has strong legal arguments in its favor and it is more likely than not that the administrative appeal of the 2014 Audit Assessment was timely filed. The 2014 Audit Assessment includes tax positions where KCSM has prior favorable court decisions or strong legal arguments in its favor. Management believes it is more likely than not it will prevail in any challenge of the 2014 Audit Assessment. Historically, the Company has not been required to pay to settle previous SAT audit assessments or has settled SAT audit assessments for an immaterial amount. On July 1, 2022, the SAT froze KCSM’s Mexico bank accounts without any request for payment of the 2014 Audit Assessment or notification of the freeze. The Company filed an amparo lawsuit challenging the legality of the bank account freeze. The district court issued a permanent injunction requiring the SAT to remove the freeze subject to KCSM posting a performance bond or other collateral upon the SAT demonstrating a tax obligation exists. In August 2022, KCSM posted a performance bond in the amount of Ps.5.6 billion (approximately $291.0 million USD) and the bank account freeze was removed. On January 5, 2023, the administrative court granted KCSM a permanent injunction to prevent any collection by the SAT. The freeze and cost of obtaining the performance bond did not have a significant impact on KCSM’s cash flows or operations. The provision of the performance bond is not an agreement or concession with regard to the 2014 Audit Assessment and in no way impacts KCSM’s ability to further defend its tax position. The Company believes that it has strong legal arguments in its favor and it is more likely than not that it will prevail in any challenge of the assessments. Refundable Mexican Value Added Tax . KCSM is not required to charge its customers value added tax (“VAT”) on international import or export transportation services, which prior to 2022 resulted in KCSM paying more VAT on its expenses than it collected from customers. These excess VAT payments are refundable by the Mexican government. Prior to 2019, Mexican companies could offset their monthly refundable VAT balance with other tax obligations. In January 2019, Mexico tax reform eliminated the ability to offset other tax obligations with refundable VAT. From 2019 through 2021, KCSM has generated a refundable VAT balance and filed refund claims with the SAT, which have not been refunded. In November 2021, changes to the VAT law were announced and became effective beginning January 1, 2022. These changes reduced the recoverability of VAT paid by KCSM on its expenditures that support international import transportation service revenues that are not subject to a VAT charge. VAT that is unrecoverable from the Mexican government results in incremental VAT expense for KCSM. Beginning in 2022, KCSM changed certain service offering to either require VAT to be charged to customers on revenue, or impose a rate increase to offset the incremental VAT expense. These measures implemented by KCSM increased the VAT to be collected from customers and payable to the Mexican government. As of December 31, 2022 and 2021, the KCSM refundable VAT balance was $78.9 million and $152.2 million, respectively. KCSM has prior favorable Mexican court decisions and a legal opinion supporting its right under Mexican law to recover the refundable VAT balance from the Mexican government and believes the VAT to be fully recoverable. KCSM will recover the refundable VAT balance as a VAT billed to customers exceeds creditable VAT charged by vendors. As of December 31, 2022 and 2021, $78.9 million and $78.0 million, respectively, of the refundable VAT balance was classified as a short-term asset.

Stockholder(s)' Equity

Stockholder(s)' Equity	12 Months Ended
	Dec. 31, 2022
Stockholders' Equity Note [Abstract]
Stockholder(s)' Equity	Stockholder(s)’ Equity Capital Stock. The Company had 100 shares of $0.01 par, common stock authorized, issued, and outstanding at December 31, 2022 and 2021. Merger Agreement . As disclosed in Note 3, Merger Agreement, the merger transaction was completed through a series of mergers as outlined in the Merger Agreement. These mergers ultimately resulted in KCS being merged with and into Surviving Merger Sub, a wholly owned subsidiary of CP, with Surviving Merger Sub continuing as the surviving entity. On December 14, 2021, the merger of KCS and Surviving Merger Sub was accounted for as a recapitalization of KCS’s equity. Pursuant to the Merger Agreement, KCS’s issued and outstanding common stock and preferred stock was replaced by the common stock of Surviving Merger Sub, which consisted of 100 issued and outstanding shares at $0.01 par value with the remaining difference being reclassified to additional paid-in capital. Upon final control approval from the STB, the transaction will be accounted for as a business combination using the acquisition method of accounting. Treasury Stock. Shares of common stock in treasury and related activity prior to the merger follow: 2021 2020 Balance at beginning of year 32,305,078 27,236,516 Shares repurchased 233,402 5,350,976 Shares issued to fund stock option exercises (189,775) (133,951) Employee stock purchase plan shares issued (41,338) (51,658) Nonvested shares issued (50,127) (111,003) Nonvested shares forfeited 16,808 14,198 Conversion of restricted shares to cash 25,049 — Recapitalization of equity (32,299,097) — Balance at end of year — 32,305,078 Cash Dividends to Canadian Pacific. Pursuant to the Merger Agreement, during 2022 KCS paid cash dividends of $880.0 million to a wholly-owned subsidiary of CP. Cash Dividends on Common Stock. The following table presents the amount of cash dividends declared per common share by the Company’s Board of Directors on the Company’s historical common stock prior to the merger: 2021 2020 Cash dividends declared per common share $ 1.62 $ 1.64

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Share-Based Compensation	Share-Based Compensation In March 2021, pursuant to the merger agreement in effect at that time, the number of shares available to grant from the 2017 equity incentive plan (“2017 Plan”) was limited to a pool of 64,051 shares to be granted in the form of restricted share awards with a vesting period of not less than 1 year. The pool expired in August 2021 and no further awards were granted. In December 2021, upon the effective date of the merger, the 2017 Plan was terminated. On December 14, 2021, upon CP’s acquisition of the Company’s common stock per the Merger Agreement, the vesting of certain unvested share-based compensation arrangements of the Company was accelerated. These awards included unvested restricted shares awarded prior to the initial merger announcement on March 21, 2021, and unvested options, which were cash settled at the Merger Consideration value less the option’s exercise price. Unvested restricted shares awarded after the initial announcement of the merger on March 21, 2021, were replaced with a fixed, cash-based award that entitled the holder thereof, upon vesting at the end of the requisite service period, to receive an amount in cash equal to the Merger Consideration. Unvested performance share awards were replaced with a fixed, cash-based award that entitles the holder thereof, upon vesting at the end of the award’s original, three-year requisite service period, to receive an amount in cash equal to the Merger Consideration value of $301.20 for each performance share award held multiplied by the maximum performance factor of 200% of the original target award. In the fourth quarter of 2021, the Company recognized $55.9 million of compensation expense from the accelerated vesting, increase in fair value and replacement of awards into a fixed, cash-based award in merger costs, net within the consolidated statements of income. As the equity incentive plan was terminated in 2021, no further equity or liability classified awards occurred. Therefore, the following disclosures are for prior year awards only. Stock Options. The exercise price for options granted under the equity incentive plans equaled the closing market price of the Company’s stock on the date of grant. Options generally had a 3-year vesting period and were exercisable over the 10-year contractual term. The grant date fair value was recorded to expense on a straight-line basis over the vesting period. The fair value of each option award was estimated on the date of grant using the Black-Scholes option pricing model. The weighted-average assumptions used were as follows: 2021 2020 Expected dividend yield 0.83 % 1.04 % Expected volatility 30.86 % 26.07 % Risk-free interest rate 0.74 % 1.27 % Expected term (years) 6.0 5.7 Weighted-average grant date fair value of stock options granted $ 58.74 $ 37.79 The expected dividend yield was calculated as the ratio of dividends paid per share of common stock to the stock price on the date of grant. The expected volatility was based on the historical volatility of the Company’s stock price over a term equal to the estimated life of the options. The risk-free interest rate was determined based on U.S. Treasury rates for instruments with terms approximating the expected term of the options granted, which represents the period of time the awards are expected to be outstanding and based on the historical experience of similar awards. Excluding the cost recognized in connection with the merger, compensation cost of $3.9 million and $4.0 million was recognized for stock option awards for the years ended December 31, 2021 and 2020, respectively. The total income tax benefit recognized in the consolidated statements of income was $0.9 million and $1.0 million for the years ended December 31, 2021 and 2020, respectively. Upon CP’s acquisition of the Company’s common stock per the Merger Agreement, the unvested stock options were fully vested, and the Company recognized an additional $12.3 million in merger costs, net within the consolidated statements of income for the acceleration of vesting and the increase in fair value of the awards to the Merger Consideration of $301.20 less the applicable option’s exercise price. The outstanding and unexercised options at the acquisition date were then cash settled by the Company for approximately $75.2 million prior to December 31, 2021, with a corresponding reduction to additional paid-in capital. The income tax benefit recognized within the consolidated statements of income from cash settling the stock options was $15.6 million. Additional information regarding stock option exercises appears in the table below (in millions) : 2021 2020 Aggregate grant-date fair value of stock options vested $ 8.5 $ 3.7 Intrinsic value of stock options exercised 34.9 13.9 Cash received from option exercises 19.9 9.9 Tax benefit from options exercised during the annual period 7.8 3.5 Nonvested Stock. The plan provided for the granting of nonvested stock awards to officers and other designated employees. The grant date fair value was based on the closing market price on the date of the grant. These awards are subject to forfeiture if employment terminates during the vesting period, which is generally 1 year or 5 years of vesting for employees. Awards granted to the Company’s directors vested immediately on date of grant. The grant date fair value of nonvested shares was recognized to compensation expense on a straight-line basis over the vesting period. The fair value (at vest date) of shares vested during the years ended December 31, 2021 and 2020 was $59.2 million and $15.3 million, respectively. The weighted-average grant date fair value of nonvested stock granted during 2021 and 2020 was $248.88 and $147.82, respectively. Excluding the cost recognized in connection with the Merger Agreement, compensation cost for nonvested stock was $9.8 million and $10.5 million, for the years ended December 31, 2021 and 2020, respectively. The total income tax benefit recognized within the consolidated statements of income was $2.4 million and $2.6 million for the years ended December 31, 2021 and 2020, respectively. For the nonvested stock granted prior to March 21, 2021, the awards were fully vested on December 3, 2021, at a price of $290.71 per share. The grantee received KCS common shares, net of shares withheld for taxes, based on the $290.71 price per share for each nonvested share held at that date. The acceleration of vesting resulted in $9.6 million of additional expense recognized in merger costs, net within the consolidated statements of income. The income tax benefit recognized from the acceleration of vesting was $2.4 million. Upon CP’s acquisition of the Company’s common stock per the Merger Agreement, the grantee received the per share Merger Consideration value for each KCS common share held. For the nonvested stock granted after March 21, 2021, each nonvested share was replaced with a cash-based award that entitles the holder to receive a fixed amount in cash equal to the Merger Consideration value of $301.20 upon rendering of the requisite service. The remaining unamortized expense will be recognized to merger costs on a straight-line basis over the remaining vesting period, which is through 2026 and is subject to the terms of the original award agreement as modified by the Merger Agreement. Performance Based Awards. The Company granted performance based nonvested stock awards during 2021 (the “2021 Awards”) and 2020 (the “2020 Awards”). The awards granted provided a target number of shares that vest at the end of a 3-year requisite service period following the grant date. In addition to the service condition, the number of nonvested shares to be received depended on the attainment of defined Company-wide performance goals based on operating ratio (“OR”) and return on invested capital (“ROIC”) over a 3-year performance period. The awards were also subject to a revenue growth multiplier based on a 3-year performance period calculated as defined in the related award agreement that can range from 80% to 120% of the award earned based on the OR and ROIC achieved. The number of nonvested shares ultimately earned would range between zero to 200% of the target award. The weighted-average grant date fair value of performance based nonvested stock granted during 2021 and 2020 was $211.10 and $157.75, respectively. The Company expensed the grant date fair value of the awards which were probable of being earned over the performance periods. Excluding the cost recognized in connection with the Merger Agreement, compensation cost on performance based awards was $10.1 million and $8.6 million for the years ended December 31, 2021 and 2020, respectively. Total income tax benefit recognized within the consolidated statements of income for performance based awards was $2.5 million and $2.1 million for the years ended December 31,2021 and 2020, respectively. The fair value (at vest date) of shares vested for the years ended December 31, 2021 and 2020 was $11.7 million, and $7.8 million, respectively. Upon CP’s acquisition of the Company’s common stock per the Merger Agreement, the unvested performance share awards were replaced with a fixed, cash-based award that entitles the holder thereof, upon vesting at the end of the award’s original, three-year requisite service period, to receive an amount in cash equal to the Merger Consideration value of $301.20 for each performance share award held multiplied by the maximum performance factor of 200% of the original target award. The increase in the fair value of the award and the number of awards to be issued resulted in additional expense of $34.0 million recognized in merger costs, net within the consolidated statements of income for the requisite service that had been provided as of December 31, 2021. The income tax benefit recognized for the additional expense was $10.7 million. The remaining unamortized expense will be recognized to merger costs over the remaining vesting period, which is through 2024 and is subject to the terms of the original award agreement as modified by the Merger Agreement. Employee Stock Purchase Plan. The employee stock purchase plan (“ESPP”) provided substantially all U.S. full-time employees of the Company, certain subsidiaries and certain other affiliated entities, with the right to subscribe to an aggregate of 4.0 million shares of common stock of the Company. Under the ESPP, eligible employees could contribute, through payroll deductions, up to 10% of their regular base compensation during six-month purchase periods at a purchase price equal to 85% of the closing market price on either the exercise date or the offering date, whichever was lower. The Company terminated its ESPP program upon entering into its initial merger agreement with CP in March 2021, thus only the January period was offered during 2021 and there were no remaining shares available for future ESPP offerings. At the end of each purchase period, the accumulated deductions were applied toward the purchase of the Company’s common stock. Both the discount in grant price and the share option purchase price were valued to derive the award’s fair value. The awards vest and the expense was recognized ratably over the offering period. The following table summarizes activity related to the various ESPP offerings: Exercise Date Received Date Purchase Shares January 2021 offering July 1, 2021 $ 170.83 18,046 $ 3.1 July 2020 offering January 5, 2021 $ 122.91 23,292 $ 2.9 January 2020 offering July 2, 2020 $ 126.90 23,709 $ 3.0 _____________________ (i) Represents amounts received from employees through payroll deductions for share purchases under applicable offering. The fair value of the ESPP stock purchase rights was estimated on the date of grant using the Black-Scholes option pricing model. The weighted-average assumptions used for each of the respective periods were as follows: Years Ended December 31, 2021 2020 Expected dividend yield 0.88 % 1.07 % Expected volatility 18.65 % 30.55 % Risk-free interest rate 0.05 % 1.01 % Expected term (years) 0.5 0.5 Weighted-average grant date fair value $ 40.40 $ 35.14

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Concession Duty. Under KCSM’s 50-year Concession, which could expire in 2047 unless extended, KCSM pays annual concession duty expense of 1.25% of gross revenues. For the year ended December 31, 2022, the concession duty expense, which is recorded within materials and other in operating expenses, was $21.2 million, compared to $18.7 million and $17.4 million for the same periods in 2021 and 2020, respectively. Litigation. Occasionally, the Company is a party to various legal proceedings, regulatory examinations, investigations, administrative actions, and other legal matters, arising for the most part in the ordinary course of business, incidental to its operations. Included in these proceedings are various tort claims brought by current and former employees for job-related injuries and by third parties for injuries related to railroad operations. KCS aggressively defends these matters and has established liability provisions that management believes are adequate to cover expected costs. The outcome of litigation and other legal matters is always uncertain. KCS believes it has valid defenses to the legal matters currently pending against it, is defending itself vigorously, and has recorded accruals determined in accordance with U.S. GAAP, where appropriate. In making a determination regarding accruals, using available information, KCS evaluates the likelihood of an unfavorable outcome in legal or regulatory proceedings to which it is a party to and records a loss contingency when it is probable a liability has been incurred and the amount of the loss can be reasonably estimated. These subjective determinations are based on the status of such legal or regulatory proceedings, the merits of KCS’s defenses and consultation with legal counsel. Actual outcomes of these legal and regulatory proceedings may materially differ from the current estimates. It is possible that resolution of one or more of the legal matters currently pending or threatened could result in losses material to KCS’s consolidated results of operations, liquidity or financial condition. Environmental Liabilities. The Company’s U.S. operations are subject to extensive federal, state and local environmental laws and regulations. The major U.S. environmental laws to which the Company is subject include, among others, the federal Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA,” also known as the Superfund law), the Toxic Substances Control Act, the Clean Water Act, and the Hazardous Materials Transportation Act. CERCLA can impose joint and several liabilities for cleanup and investigation costs, without regard to fault or legality of the original conduct, on current and predecessor owners and operators of a site, as well as those who generate, or arrange for the disposal of, hazardous substances. The Company does not believe that compliance with the requirements imposed by the environmental legislation will impair its competitive capability or result in any material additional capital expenditures, operating or maintenance costs. The Company is, however, subject to environmental remediation costs as described in the following paragraphs. The Company’s Mexico operations are subject to Mexican federal and state laws and regulations relating to the protection of the environment through the establishment of standards for water discharge, water supply, emissions, noise pollution, hazardous substances and transportation and handling of hazardous and solid waste. The Mexican government may bring administrative and criminal proceedings, impose economic sanctions against companies that violate environmental laws, and temporarily or even permanently close non-complying facilities. The risk of incurring environmental liability is inherent in the railroad industry. As part of serving the petroleum and chemicals industry, the Company transports hazardous materials and has a professional team available to respond to and handle environmental issues that might occur in the transport of such materials. The Company performs ongoing reviews and evaluations of the various environmental programs and issues within the Company’s operations, and, as necessary, takes actions intended to limit the Company’s exposure to potential liability. Although these costs cannot be predicted with certainty, management believes that the ultimate outcome of identified matters will not have a material adverse effect on the Company’s consolidated financial statements. Personal Injury. The Company’s personal injury liability is based on semi-annual actuarial studies performed on an undiscounted basis by an independent third party actuarial firm and reviewed by management. This liability is based on personal injury claims filed and an estimate of claims incurred but not yet reported. Actual results may vary from estimates due to the number, type and severity of the injury, costs of medical treatments and uncertainties in litigation. Adjustments to the liability are reflected within operating expenses in the period in which changes to estimates are known. Personal injury claims in excess of self-insurance levels are insured up to certain coverage amounts, depending on the type of claim and year of occurrence. The personal injury liability as of December 31, 2022, is based on an updated actuarial study of personal injury claims through October 31, 2022, and review of the last two months’ experience. For the year ended December 31, 2022, the Company recognized an increase of $1.4 million in personal injury liability due to changes in estimates as a result of the Company’s semi-annual actuarial studies and $18.3 million due to accruals, including unfavorable judgments on claims filed against the Company. These increases were partially offset by a decrease of $15.6 million due to payments made on claims during 2022. The personal injury liability activity was as follows (in millions): 2022 2021 Balance at beginning of year $ 32.6 $ 31.3 Accruals 18.3 6.3 Changes in estimate 1.4 (1.4) Payments (15.6) (3.6) Balance at end of year $ 36.7 $ 32.6 Tax Contingencies. Information regarding tax contingencies is included in Note 13, Income Taxes — Tax Contingencies. Contractual Agreements. In the normal course of business, the Company enters into various contractual agreements related to commercial arrangements and the use of other railroads’ or governmental entities’ infrastructure needed for the operations of the business. The Company is involved or may become involved in certain disputes involving transportation rates, product loss or damage, charges, and interpretations related to these agreements. While the outcome of these matters cannot be predicted with certainty, the Company believes that, when resolved, these disputes will not have a material effect on its consolidated financial statements. On July 14, 2022, KCSM reached an agreement with the SICT to fund a new investment in the Celaya-NBA Line Railway Bypass and related infrastructure in an amount not to exceed Ps.4.0 billion (approximately $200.0 million USD). In exchange for the investment, the SICT agreed to amend KCSM’s Concession Title effective July 14, 2022, to extend the exclusivity rights granted to KCSM for an additional period of 10 years. Under this amendment, KCSM’s exclusivity will now expire in 2037. Credit Risk. The Company continually monitors risks related to economic changes and certain customer receivables concentrations. Significant changes in customer concentration or payment terms, deterioration of customer creditworthiness, bankruptcy, insolvency or liquidation of a customer, or weakening in economic trends could have a significant impact on the collectability of the Company’s receivables and its operating results. If the financial condition of the Company’s customers were to deteriorate and result in an impairment of their ability to make payments, additional allowances may be required. The Company has recorded provisions for uncollectability based on its best estimate as of December 31, 2022. Panama Canal Railway Company (”PCRC”) Guarantees and Indemnities. At December 31, 2022, the Company had issued and outstanding $5.8 million under a standby letter of credit to fulfill its obligation to fund fifty percent of the debt service reserve and liquidity reserve established by PCRC in connection with the issuance of the 7.0% Senior Secured Notes due November 1, 2026 (the “PCRC Notes”). Additionally, KCS has pledged its shares of PCRC as security for the PCRC Notes.

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2022
Quarterly Financial Data [Abstract]
Quarterly Financial Data (Unaudited)	Quarterly Financial Data (Unaudited) Fourth Third Second First (In millions, except per share amounts) 2022 Revenues $ 864.5 $ 882.2 $ 845.5 $ 778.2 Operating income (i) 298.2 325.0 312.8 291.1 Net income (ii) 400.0 201.7 194.1 188.0 Net income attributable to Kansas City Southern and subsidiaries 399.4 201.3 194.1 187.4 2021 Revenues $ 747.8 $ 744.0 $ 749.5 $ 706.0 Operating income (loss) (iii) 810.6 251.9 (431.7) 253.0 Net income (loss) 595.1 156.5 (378.0) 153.4 Net income (loss) attributable to Kansas City Southern and subsidiaries 594.5 156.2 (378.5) 153.0 _____________________ (i) During the first, second, third and fourth quarters of 2022, the Company recognized pre-tax net merger costs of $12.8 million, $12.5 million, $11.5 million, and $9.8 million, respectively, related to the Company’s merger with CP. (ii) During the fourth quarter of 2022, the Company recognized the gain on settlement of the interest rate derivative instruments of $259.3 million. Refer to Note 10, Derivative Instruments for more information.

Geographic Information

Geographic Information	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Geographic Information	Geographic Information The Company strategically manages its rail operations as one reportable business segment over a single coordinated rail network that extends from the midwest and southeast portions of the United States south into Mexico and connects with other Class I railroads. Financial information reported at this level, such as revenues, operating income and cash flows from operations, is used by corporate management, including the Company’s chief operating decision-maker, in evaluating overall financial and operational performance, market strategies, as well as the decisions to allocate capital resources. The Company’s chief operating decision-maker is the chief executive officer. The following tables provide information by geographic area (in millions) : Years ended December 31, 2022 2021 2020 Revenues U.S. $ 1,816.2 $ 1,580.6 $ 1,388.5 Mexico 1,554.2 1,366.7 1,244.1 Total revenues $ 3,370.4 $ 2,947.3 $ 2,632.6 December 31, 2022 2021 Property and equipment (including Concession assets), net U.S. $ 5,885.3 $ 5,744.4 Mexico 3,477.1 3,464.9 Total property and equipment (including Concession assets), net $ 9,362.4 $ 9,209.3

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events KCS Dividend to CP On February 1, 2023, KCS paid a cash dividend of $225.0 million to a wholly-owned subsidiary of CP. Foreign Currency Hedging At December 31, 2022, the Company had outstanding foreign currency forward contracts with an aggregate notional amount of $535.0 million, which matured during January 2023 and obligated the Company to sell a total of Ps.11,235.2 million at a weighted-average rate of Ps.21.0 to each U.S. dollar. During January 2023, the Company entered into offsetting contracts with an aggregate notional amount of $581.4 million, which matured during January 2023 and obligated the Company to purchase a total of Ps.11,235.2 million at a weighted-average exchange rate of Ps.19.3 to each U.S. dollar, resulting in cash paid of $46.4 million. During January 2023, the Company entered into several foreign currency forward contracts with an aggregate notional amount of $250.0 million and maturity dates in 2023 and 2024. These contracts obligated the Company to sell a total of Ps.5,114.6 million at a weighted-average exchange rate of Ps.20.5 to each U.S. dollar. The Company has not designated these foreign currency derivative instruments as hedging instruments for accounting purposes. The Company will measure the foreign currency derivative instruments at fair value each period and will recognize any change in fair value in foreign exchange gain (loss) within the consolidated statements of income.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Principles of Consolidation Policy	Principles of Consolidation. The accompanying consolidated financial statements are presented using the accrual basis of accounting and include the Company and its majority-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. Certain prior year amounts have been reclassified to conform to the current year presentation. The equity method of accounting is used for all entities in which the Company or its subsidiaries have significant influence, but not a controlling interest. The Company evaluates less-than-majority-owned investments for consolidation pursuant to consolidation and variable interest entity guidance. The Company does not have any less-than-majority-owned investments requiring consolidation. In November 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2021-10, Government Assistance (Topic 832), Disclosures by Business Entities about Government Assistance. The standard is intended to increase transparency of government assistance by requiring disclosures of the following: (1) the types of assistance, (2) an entity’s accounting for the assistance, and (3) the effect of the assistance on the entity’s financial statements. This ASU was effective for the Company on January 1, 2022 and the Company adopted the ASU prospectively. See Note 7, Property and Equipment for the newly required disclosure.
Use of Estimates Policy	Use of Estimates. The accounting and financial reporting policies of the Company conform to accounting principles generally accepted in the United States of America (“U.S. GAAP”). The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include those related to the recoverability and useful lives of assets and income taxes. Changes in facts and circumstances may result in revised estimates and actual results could differ from those estimates.
Revenue Recognition Policy	Revenue Recognition. The primary performance obligation for the Company is to move customers’ freight from an origin to a destination. A performance obligation is created when a customer under a transportation contract or public tariff submits a bill of lading for the transport of goods. The Company recognizes revenue proportionally as a shipment moves from origin to destination, using the distance shipped to measure progress, as the customer simultaneously receives and consumes the benefit over time. Related expenses are recognized as incurred. Revenue associated with in-transit shipments at period end is recognized based on the distance shipped as of the balance sheet date. Payment is received at the time or shortly after the performance obligation is satisfied. The transaction price is generally in the form of a fixed fee determined at the inception of the transportation contract or the inception of the bill of lading. Certain customer agreements have variable consideration that are based on milestone achievements in the form of rebates, discounts or incentives. The Company makes judgments to determine whether the variable consideration is probable of occurring and should be included in the estimated transaction price at the beginning of the period to apply a more consistent rate throughout the year based on an analysis of historical experience with the customer, forecasted shipments and other economic indicators. The Company adjusts the estimate on a quarterly basis.
Foreign Exchange Gain (Loss) Policy	Foreign Exchange Gain (Loss). For financial reporting purposes, foreign subsidiaries maintain records in U.S. dollars, which is the functional currency. The dollar is the currency that reflects the economic substance of the underlying events and circumstances relevant to the entity. Monetary assets and liabilities denominated in Mexican pesos (“pesos” or “Ps.”) are remeasured into U.S. dollars (“dollars”) using current exchange rates. The difference between the exchange rate on the date of the transaction and the exchange rate on the settlement date, or balance sheet date if not settled, is included in the income statement as foreign exchange gain or loss.
Cash Equivalents Policy	Cash Equivalents. Short-term liquid investments with an initial maturity of three months or less are classified as cash and cash equivalents.
Accounts Receivable, net Policy	Accounts Receivable, net. Accounts receivable are net of an allowance for uncollectible accounts as determined by historical experience and adjusted for economic uncertainties, known trends, and reasonable supportable forecasts. Accounts are charged to the allowance when a customer enters bankruptcy, when an account has been transferred to a collection agent or submitted for legal action, or when a customer is significantly past due and all available means of collection have been exhausted.
Materials and Supplies Policy	Materials and Supplies. Materials and supplies consisting of diesel fuel, items to be used in the maintenance of rolling stock and items to be used in the maintenance or construction of road property are valued at the lower of average cost or net realizable value.
Derivative Instruments Policy	Derivative Instruments. Derivatives are measured at fair value and recorded on the balance sheet as either assets or liabilities. Changes in the fair value of derivatives are recorded either through current earnings or as other comprehensive income (loss), depending on hedge designation. Gains and losses on derivative instruments classified as cash flow hedges are reported in other comprehensive income (loss) and are reclassified into earnings in the periods in which earnings are impacted by the variability of the cash flow of the hedged item.
Property and Equipment (including Concession Assets) Policy	Property and Equipment (including Concession Assets). KCS capitalizes costs for self-constructed additions and improvements to property including direct labor and material, indirect costs, and interest during long-term construction projects. For purchased assets, all costs necessary to make the asset ready for its intended use are capitalized. Expenditures that significantly increase asset values, productive capacity, efficiency, safety or extend useful lives are capitalized. Repair and maintenance costs are expensed as incurred. The Company has a process to determine which costs qualify for capitalization, which requires judgment. KCS capitalizes certain costs incurred with developing or obtaining internal-use software. Costs incurred during the preliminary project and post-implementation stage, as well as maintenance and training costs are expensed as incurred. Property and equipment are carried at cost and are depreciated primarily on the group method of depreciation, which the Company believes closely approximates a straight line basis over the estimated useful lives of the assets measured in years. The group method of depreciation applies a composite rate to classes of similar assets rather than to individual assets. Composite depreciation rates are based upon the Company’s estimates of the expected average useful lives of assets as well as expected net salvage value at the end of their useful lives. In developing these estimates, the Company utilizes periodic depreciation studies performed by an independent engineering firm. Depreciation rate studies are performed at least every three years for equipment and at least six years for road property (rail, ties, ballast, etc.). The Company completed depreciation studies for KCSR in 2021 and KCSM in 2020. The impact of the KCSR study resulted in approximately $12.0 million in additional depreciation expense in 2022. The impact of the KCSM study was immaterial to the consolidated financial results for all periods presented. Under the group method of depreciation, the cost of railroad property and equipment (net of salvage or sales proceeds) retired or replaced in the normal course of business is charged to accumulated depreciation with no gain or loss recognized. Gains or losses on dispositions of land or non-group property and abnormal retirements of railroad property are recognized through income. A retirement of railroad property would be considered abnormal if the cause of the retirement is unusual in nature, is significant in amount, and varies significantly from the retirement profile identified through the depreciation studies. Costs incurred by the Company to acquire the Concession rights and related assets, as well as subsequent improvements to the Concession assets, are capitalized and amortized using the group method of depreciation over the lesser of the current expected Concession term, including probable renewal of an additional 50-year term, or the estimated useful lives of the assets and rights.
Impairment of Long-Lived Assets Policy	Impairment of Long-Lived Assets. Long-lived assets, including property and equipment, operating lease right-of-use assets and intangible assets with finite lives are reviewed for impairment and written down to fair value when events or circumstances indicate that the carrying amount of a long-lived asset or asset group may not be recoverable. If impairment indicators are present and the estimated future undiscounted cash flows are less than the carrying value of the long-lived assets, the carrying value would be reduced to the estimated fair value. Future cash flow estimates for an impairment review would be based on the lowest level of identifiable cash flows, which are the Company’s U.S. and Mexican operations.
Leases Policy	Leases. The Company leases transportation equipment, as well as office and other operating facilities, under various finance and operating leases. Operating lease right-of-use assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As the implicit rate is not readily determinable in most of the Company’s lease agreements, the Company uses its estimated secured incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Lease expense is recognized on a straight-line basis over the lease term. The Company determines if an arrangement is a lease or contains a lease at inception. The Company’s leases have remaining lease terms of approximately 1 year to 7 years, which may include the option to extend the lease when it is reasonably certain the Company will exercise that option. The Company does not separately identify lease and nonlease components (i.e. maintenance costs) except for fleet vehicles and real estate. The Company does not have lease agreements with residual value guarantees, sale leaseback terms or material restrictive covenants. Additionally, short-term leases and leases with variable lease costs are immaterial, and the Company does not have any sublease arrangements.
Goodwill Policy	Goodwill. Goodwill represents the excess of the purchase price over the fair value of the net identifiable assets acquired in business combinations. As of December 31, 2022 and 2021, the goodwill balance was $13.2 million, which is included in other assets in the consolidated balance sheets. Goodwill is not amortized, but is reviewed at least annually, or more frequently as indicators warrant, for impairment. An impairment loss would be recognized to the extent that the carrying amount exceeds the reporting units’ fair values.
Investments and Impairment Policy	Investments and Impairment. The Company reviews equity method investments for impairment whenever events or changes in circumstances indicate that the carrying amount of the investment may not be recoverable in accordance with generally accepted accounting principles. This determination requires significant judgment. In making this judgment, the Company considers available quantitative and qualitative evidence in evaluating potential impairment of these investments. If it is determined that an indicator of impairment exists, the Company assesses whether the carrying value exceeds the fair value of the asset. If the carrying value of the investment exceeds its fair value, the Company will evaluate, among other factors, general market conditions, the duration and extent to which the carrying value is greater than the fair value, and KCS’s intent and ability to hold, or plans to sell, the investment. The Company also considers specific adverse conditions related to the financial health of and business outlook for the investee, including industry and sector performance, changes in technology, and operational and financing cash flow factors. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded and a new carrying basis in the investment is established.
Fair Value of Financial Instruments Policy	Fair Value of Financial Instruments. Non-financial assets and liabilities are recognized at fair value on a nonrecurring basis. These assets and liabilities are measured at fair value on an ongoing basis but are subject to recognition in the financial statements only in certain circumstances. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company determines the fair values of its financial instruments based on the fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The hierarchy is broken down into three levels based upon the observability of inputs. Fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access. Level 2 inputs include quoted prices for similar assets and liabilities in active markets, and inputs other than quoted prices that are observable for the asset or liability. Level 3 inputs are unobservable inputs for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value in its entirety requires judgment and considers factors specific to the asset or liability.
Environmental Liabilities Policy	Environmental Liabilities. The Company recognizes liabilities for remediation and restoration costs when the Company’s obligation is probable and the costs can be reasonably estimated. Costs of future expenditures for environmental remediation and restoration are not discounted to their present value. Recoveries of environmental remediation costs from other parties are recorded as assets when their receipt is deemed probable. Costs of ongoing compliance activities related to current operations are expensed as incurred.
Personal Injury Claims Policy	Personal Injury Claims. Personal injury claims in excess of self-insurance levels are insured up to certain coverage amounts, depending on the type of claim and year of occurrence. The Company’s personal injury liability is based on actuarial studies performed on an undiscounted basis by an independent third party actuarial firm and reviewed by management. The liability is based on claims filed and an estimate of claims incurred but not yet reported. Adjustments to the liability are reflected as operating expenses in the period in which the adjustments are known. Legal fees related to personal injury claims are recognized in operating expense in the period incurred.
Health and Welfare and Postemployment Benefits Policy	Health and Welfare and Postemployment Benefits. The Company provides certain medical, life and other postemployment benefits to certain active employees and retirees. The Company uses actuaries to assist management in measuring the benefit obligation and cost based on the current plan provisions, employee demographics, and assumptions about financial and demographic factors affecting the probability, timing and amount of expected future benefit payments. Significant assumptions include the discount rate, rate of increase in compensation levels, and the health care cost trend rate. Actuarial gains and losses determined at the measurement date (December 31) are recognized immediately in the consolidated statements of income.
Share-Based Compensation Policy	Share-Based Compensation. The Company accounted for all share-based compensation in accordance with fair value recognition provisions. Under this method, compensation expense was measured at grant date fair value and recognized over the requisite service period in which the award was earned. Forfeitures were recognized as they occurred. The Company had historically issued treasury stock to settle share-based awards.
Income Taxes Policy	Income Taxes. Deferred income tax effects of transactions reported in different periods for financial reporting and income tax return purposes are recognized under the asset and liability method of accounting for income taxes. This method gives consideration to the future tax consequences of the deferred income tax items and immediately recognizes changes in income tax laws in the year of enactment. The Company has recognized a deferred tax asset, net of a valuation allowance, for net operating loss and capital loss carryovers. The Company projects sufficient future taxable income to realize the deferred tax asset recorded less the valuation allowance. These projections take into consideration assumptions about future income, future capital expenditures and inflation rates. If assumptions or actual conditions change, the deferred tax asset, net of the valuation allowance, will be adjusted to properly reflect the expected tax benefit.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Schedule of Leases	Leases Classification December 31, 2022 December 31, 2021 Assets (in millions) Operating Operating lease right-of-use assets $ 100.9 $ 69.6 Finance Property and equipment (including Concession assets), net 17.8 13.9 Total leased assets $ 118.7 $ 83.5 Liabilities Current Operating Accounts payable and accrued liabilities $ 28.8 $ 22.3 Finance Long-term debt due within one year 6.3 4.5 Noncurrent Operating Long-term operating lease liabilities 71.5 46.4 Finance Long-term debt 12.4 10.9 Total lease liabilities $ 119.0 $ 84.1
Schedule of Lease Cost Components	Years ended Lease Cost Classification December 31, 2022 December 31, 2021 December 31, 2020 Operating lease cost: (in millions) Equipment costs $ 20.8 $ 19.6 $ 23.3 Materials and other 5.7 5.8 5.0 Finance lease cost: Amortization of finance lease assets Depreciation and amortization 2.8 1.7 1.6 Interest on lease liabilities Interest expense 0.6 0.6 0.9 Total lease cost $ 29.9 $ 27.7 $ 30.8
Schedule of Cash Flow Information	Years ended Cash Flow Information December 31, 2022 December 31, 2021 December 31, 2020 (in millions) Cash paid for operating leases included in operating activities $ 32.5 $ 29.4 $ 45.6 Cash paid for finance leases included in operating activities 0.7 0.8 0.9 Cash paid for finance leases included in financing activities 5.9 3.5 2.0 Right-of-use assets obtained in exchange for operating lease liabilities 58.9 32.9 18.4 Right-of-use assets obtained in exchange for financing lease liabilities 9.2 11.5 0.8
Schedule of Lease Term and Discount Rate	Lease Term and Discount Rate December 31, 2022 December 31, 2021 Weighted-average remaining lease term (years) Operating leases 4.2 4.2 Finance leases 3.6 3.8 Weighted-average discount rate Operating leases 2.9 % 2.2 % Finance leases 3.5 % 5.1 %
Schedule of Remaining Maturities of Lease Liabilities	Remaining Maturities of Lease Liabilities Year Ending December 31 ( in millions ), Operating Leases Finance Leases 2023 $ 29.7 $ 6.8 2024 25.6 4.5 2025 18.9 4.2 2026 17.0 3.6 2027 9.5 0.4 Thereafter 3.5 — Total lease payments 104.2 19.5 Less imputed interest 3.9 0.8 Total $ 100.3 $ 18.7

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The following table presents revenues disaggregated by the major commodity groups as well as the product types included within the major commodity groups (in millions) . The Company believes disaggregation by product type best depicts how cash flows are affected by economic factors. See Note 18, Geographic Information in the consolidated financial statements for revenues by geographical area. Years ended December 31, 2022 2021 2020 Chemical & Petroleum Chemicals $ 291.9 $ 263.5 $ 236.7 Petroleum 324.8 442.1 375.0 Plastics 166.8 146.2 152.1 Total 783.5 851.8 763.8 Industrial & Consumer Products Forest Products 295.8 261.8 247.8 Metals & Scrap 257.3 204.9 188.4 Other 157.5 122.9 101.5 Total 710.6 589.6 537.7 Agriculture & Minerals Grain 432.5 358.6 299.6 Food Products 175.1 152.3 154.6 Ores & Minerals 33.5 25.9 21.8 Stone, Clay & Glass 40.9 34.9 29.4 Total 682.0 571.7 505.4 Energy Utility Coal 165.3 148.5 105.6 Coal & Petroleum Coke 49.2 47.3 41.8 Frac Sand 18.3 15.6 11.3 Crude Oil 72.4 43.4 36.3 Total 305.2 254.8 195.0 Intermodal 449.7 346.3 319.1 Automotive 258.4 183.2 172.7 Total Freight Revenues 3,189.4 2,797.4 2,493.7 Other Revenue 181.0 149.9 138.9 Total Revenues $ 3,370.4 $ 2,947.3 $ 2,632.6
Schedule of Changes in Contract Liabilities	The following tables summarize the changes in contract liabilities (in millions) : Contract liabilities Years ended December 31, 2022 2021 Beginning balance $ 68.4 $ 29.9 Revenue recognized that was included in the contract liability balance at the beginning of the period (34.1) (29.7) Increases due to consideration received, excluding amounts recognized as revenue during the period 29.8 68.2 Ending balance $ 64.1 $ 68.4

Property and Equipment (inclu_2

Property and Equipment (including Concession Assets) (Tables)	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property Plant and Equipment by Type	The following tables list the major categories of property and equipment, including Concession assets, as well as the weighted-average composite depreciation rate for each category ( in millions ): As of December 31, 2022 Cost Accumulated Net Book Depreciation Land $ 244.7 $ — $ 244.7 N/A Concession land rights 141.1 (33.6) 107.5 1.0 % Rail and other track material 2,394.8 (454.3) 1,940.5 1.9-3.6% Ties 1,868.0 (475.8) 1,392.2 1.4-5.4% Grading 1,013.1 (210.8) 802.3 1.0 % Bridges and tunnels 940.8 (192.3) 748.5 1.3 % Ballast 940.2 (277.8) 662.4 2.2-4.4% Other (a) 1,652.5 (567.7) 1,084.8 3.0 % Total road property 8,809.4 (2,178.7) 6,630.7 2.7 % Locomotives 1,826.2 (637.0) 1,189.2 5.0 % Freight cars 995.0 (266.4) 728.6 2.9 % Other equipment 83.0 (41.1) 41.9 5.2 % Total equipment 2,904.2 (944.5) 1,959.7 4.3 % Technology and other 453.7 (335.6) 118.1 10.9 % Construction in progress 301.7 — 301.7 N/A Total property and equipment (including Concession assets) $ 12,854.8 $ (3,492.4) $ 9,362.4 N/A _____________ (a) Other includes signals, buildings and other road assets. As of December 31, 2021 Cost Accumulated Net Book Depreciation Land $ 243.0 $ — $ 243.0 N/A Concession land rights 141.1 (32.2) 108.9 1.0 % Rail and other track material 2,240.6 (417.7) 1,822.9 1.8-3.6% Ties 1,790.0 (435.6) 1,354.4 1.4-5.4% Grading 1,006.8 (200.3) 806.5 1.0 % Bridges and tunnels 884.1 (181.0) 703.1 1.3 % Ballast 898.6 (258.2) 640.4 2.2-4.4% Other (a) 1,610.5 (519.6) 1,090.9 2.7 % Total road property 8,430.6 (2,012.4) 6,418.2 2.6 % Locomotives 1,777.2 (546.6) 1,230.6 4.5 % Freight cars 974.2 (234.4) 739.8 2.2 % Other equipment 91.0 (39.9) 51.1 5.0 % Total equipment 2,842.4 (820.9) 2,021.5 3.7 % Technology and other 372.6 (290.7) 81.9 15.6 % Construction in progress 335.8 — 335.8 N/A Total property and equipment (including Concession assets) $ 12,365.5 $ (3,156.2) $ 9,209.3 N/A _____________ (a) Other includes signals, buildings and other road assets.

Other Balance Sheet Captions (T

Other Balance Sheet Captions (Tables)	12 Months Ended
	Dec. 31, 2022
Other Balance Sheet Captions [Abstract]
Schedule of Other Current Assets	Other current assets included the following items at December 31 (in millions): 2022 2021 Prepaid expenses $ 28.4 $ 25.8 Refundable Mexican value added tax 78.9 78.0 Prepaid income taxes 14.3 19.0 Advances to affiliates 8.8 9.0 Other 8.4 10.3 Other current assets $ 138.8 $ 142.1
Schedule of Accounts Payable and Accrued Liabilities	Accounts payable and accrued liabilities included the following items at December 31 (in millions): 2022 2021 Accounts payable $ 207.2 $ 169.7 Accrued wages and vacation 128.4 103.7 Accrued merger costs 55.8 37.3 Income and other taxes 41.9 37.0 Foreign currency forward contracts 41.0 1.8 Contract liabilities 31.3 30.0 Short-term operating lease liability 28.8 22.3 Interest payable 26.2 26.2 Derailments, personal injury and other claim provisions 25.1 27.5 Accrued rents and leases 13.3 7.7 Other 36.7 16.5 Accounts payable and accrued liabilities $ 635.7 $ 479.7

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Schedule of Fair Value of the Company's Financial Instruments	The fair value of the Company’s financial instruments is presented in the following table (in millions) : December 31, 2022 December 31, 2021 Level 2 Level 2 Assets Treasury lock agreements $ — $ 57.4 Liabilities Debt instruments 3,308.3 4,311.1 Foreign currency derivative instruments 41.0 1.8

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Foreign Currency Derivative Instruments	Below is a summary of the Company’s 2022, 2021 and 2020 foreign currency derivative contracts (amounts in millions, except Ps./USD) : Foreign currency forward contracts Contracts to sell Ps./receive USD Offsetting contracts to purchase Ps./pay USD Notional amount Notional amount Weighted-average exchange rate (in Ps./USD) Notional amount Notional amount Weighted-average exchange rate (in Ps./USD) Cash received/(paid) on settlement Contracts executed in 2022 and outstanding $ 535.0 Ps. 11,235.2 Ps. 21.0 — — — — Contracts executed in 2022 and settled in 2022 $ 110.0 Ps. 2,348.4 Ps. 21.3 $ 113.4 Ps. 2,348.4 Ps. 20.7 $ (3.4) Contracts executed in 2021 and settled in 2022 $ 270.0 Ps. 5,583.3 Ps. 20.7 $ 271.7 Ps. 5,583.3 Ps. 20.6 $ (1.7) Contracts executed in 2020 and settled in 2020 $ 75.0 Ps. 1,555.5 Ps. 20.7 $ 78.0 Ps. 1,555.5 Ps. 20.0 $ (2.9) Contracts to purchase Ps./pay USD Offsetting contracts to sell Ps./receive USD Notional amount Notional amount Weighted-average exchange rate (in Ps./USD) Notional amount Notional amount Weighted-average exchange rate (in Ps./USD) Cash received/(paid) on settlement Contracts executed in 2021 and settled in 2021 $ 100.0 Ps. 1,993.5 Ps. 19.9 $ 98.1 Ps. 1,993.5 Ps. 20.3 $ (1.9) Contracts executed in 2020 and settled in 2020 $ 555.0 Ps. 11,254.3 Ps. 20.3 $ 534.3 Ps. 11,254.3 Ps. 21.1 $ (20.7) Contracts executed in 2019 and settled in 2020 $ 105.0 Ps. 2,041.2 Ps. 19.4 $ 108.6 Ps. 2,041.2 Ps. 18.8 $ 3.6
Schedule of Derivative Instruments in Consolidated Balance Sheets, Fair Value	The following table presents the fair value of derivative instruments included in the consolidated balance sheets at December 31 (in millions) : Derivative Assets Balance Sheet Location 2022 2021 Derivatives designated as hedging instruments: Treasury lock agreements Other assets — $ 57.4 Total derivatives designated as hedging instruments — 57.4 Total derivative assets — $ 57.4 Derivative Liabilities Balance Sheet Location 2022 2021 Derivatives not designated as hedging instruments: Foreign currency forward contracts Accounts payable and accrued liabilities $ 41.0 $ 1.8 Total derivatives not designated as hedging instruments 41.0 1.8 Total derivative liabilities $ 41.0 $ 1.8
Schedule of Offsetting of Derivative Liabilities	The following table summarizes the gross and net fair value of derivative liabilities (in millions) : As of December 31, 2022 Gross Liabilities Gross Net Amounts Presented in the Consolidated Balance Sheets Derivatives subject to a master netting arrangement or similar agreement $ 41.0 — $ 41.0 As of December 31, 2021 Derivatives subject to a master netting arrangement or similar agreement $ 2.8 $ (1.0) $ 1.8
Schedule of Derivative Instruments, Gain (Loss) in Consolidated Statements of Income and Consolidated Statements of Comprehensive Income	The following tables present the effects of derivative instruments on the consolidated statements of income and consolidated statements of comprehensive income for the years ended December 31 (in millions) : Derivatives in Cash Flow Hedging Relationships Amount of Gain/(Loss) Recognized in OCI on Derivative Location of Gain/(Loss) Reclassified from AOCI into Income Amount of Gain/(Loss) Reclassified from AOCI into Income 2022 2021 2020 2022 2021 2020 Treasury lock agreements $ 201.9 $ 21.8 $ 35.6 Interest expense $ (2.4) $ (2.5) $ (2.4) Gain on settlement of treasury lock agreements 259.3 — — Total $ 201.9 $ 21.8 $ 35.6 $ 256.9 $ (2.5) $ (2.4) Derivatives Not Designated as Hedging Instruments Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Recognized in Income on Derivative 2022 2021 2020 Foreign currency forward contracts Foreign exchange loss $ (44.3) $ (3.7) $ (22.5) Total $ (44.3) $ (3.7) $ (22.5)

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Schedule of Long-Term Debt Instruments	Long-term debt at December 31 (in millions): 2022 2021 Principal Unamortized Discount and Debt Issuance Costs Net Principal Unamortized Discount and Debt Issuance Costs Net Revolving credit facilities, variable interest rate, due 2024 $ — $ — $ — $ — $ — $ — KCS 3.00% senior notes, due 2023 439.1 0.3 438.8 439.1 1.0 438.1 KCS 3.85% senior notes, due 2023 199.2 0.2 199.0 199.2 0.5 198.7 KCS 3.125% senior notes, due 2026 250.0 1.3 248.7 250.0 1.7 248.3 KCS 2.875% senior notes, due 2029 425.0 3.0 422.0 425.0 3.4 421.6 KCS 4.30% senior notes, due 2043 448.7 7.8 440.9 448.7 8.1 440.6 KCS 4.95% senior notes, due 2045 499.2 6.4 492.8 499.2 6.7 492.5 KCS 4.70% senior notes, due 2048 500.0 5.4 494.6 500.0 5.6 494.4 KCS 3.50% senior notes, due 2050 550.0 10.1 539.9 550.0 10.4 539.6 KCS 4.20% senior notes, due 2069 425.0 6.7 418.3 425.0 6.8 418.2 KCSR 3.85% to 4.95% senior notes, due through 2045 2.7 — 2.7 2.7 — 2.7 KCSM 3.00% senior notes, due 2023 5.6 — 5.6 5.6 — 5.6 RRIF loans 2.96% to 4.29%, due serially through 2037 57.7 0.3 57.4 62.0 0.3 61.7 Finance lease obligations, due serially to 2027 18.7 — 18.7 15.4 — 15.4 Other debt obligations 0.2 — 0.2 0.2 — 0.2 Total 3,821.1 41.5 3,779.6 3,822.1 44.5 3,777.6 Less: Debt due within one year 655.5 0.5 655.0 8.8 — 8.8 Long-term debt $ 3,165.6 $ 41.0 $ 3,124.6 $ 3,813.3 $ 44.5 $ 3,768.8
Schedule Of Future Minimum Payments For Long-Term Debt	Minimum annual payments for debt maturities are as follows (in millions) : Years Long-Term Debt Net Present Value Finance Leases Total 2023 $ 649.2 $ 6.3 $ 655.5 2024 4.6 4.3 8.9 2025 5.0 4.1 9.1 2026 255.0 3.6 258.6 2027 5.2 0.4 5.6 Thereafter 2,883.4 — 2,883.4 Total $ 3,802.4 $ 18.7 $ 3,821.1

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense	Tax Expense. Income tax expense consists of the following components (in millions): 2022 2021 2020 Current: Federal $ 88.4 $ 18.1 $ (1.9) State and local 8.2 2.7 1.6 Foreign 194.3 167.1 155.0 Total current 290.9 187.9 154.7 Deferred: Federal 52.7 21.2 49.4 State and local (3.3) (1.6) 13.8 Foreign (14.4) 3.6 (13.8) Total deferred 35.0 23.2 49.4 Total income tax expense $ 325.9 $ 211.1 $ 204.1
Schedule of Income before Income Taxes, Domestic and Foreign	Income before income taxes consists of the following (in millions) : 2022 2021 2020 Income before income taxes: U.S. $ 662.1 $ 148.6 $ 329.0 Foreign 647.6 589.5 494.2 Total income before income taxes $ 1,309.7 $ 738.1 $ 823.2
Schedule of Deferred Tax Assets and Liabilities	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31 follow (in millions): 2022 2021 Assets: Reserves not currently deductible for tax $ 65.5 $ 42.5 Compensation and benefits 32.0 28.0 Lease liability 26.9 19.4 Tax credit and loss carryovers 14.8 26.4 Other 26.5 6.5 Gross deferred tax assets before valuation allowance 165.7 122.8 Valuation allowance (2.1) (7.3) Net deferred tax assets 163.6 115.5 Liabilities: Property (1,317.1) (1,253.0) Investments (57.9) (56.0) Other (25.7) (20.2) Gross deferred tax liabilities (1,400.7) (1,329.2) Net deferred tax liability $ (1,237.1) $ (1,213.7)
Schedule of Effective Income Tax Rate Reconciliation	Tax Rates. Differences between the Company’s effective income tax rate and the U.S. federal statutory income tax rate of 21% follow (in millions): 2022 2021 2020 Dollars Percent Dollars Percent Dollars Percent Income tax expense using the statutory rate in effect $ 275.0 21.0 % $ 155.0 21.0 % $ 172.9 21.0 % Tax effect of: Difference between U.S. and foreign tax rate 57.4 4.4 % 51.9 7.0 % 44.1 5.4 % Inflation (25.8) (2.0 %) (10.4) (1.4 %) (4.9) (0.6 %) Tax credits (11.9) (0.9 %) (11.7) (1.6 %) (13.8) (1.7 %) Foreign exchange (i) 9.4 0.7 % 5.9 0.8 % (3.4) (0.4 %) State and local income tax provision, net 9.1 0.7 % 0.2 — 12.5 1.5 % Withholding tax 8.5 0.6 % 8.5 1.2 % 9.9 1.2 % Non-deductible executive compensation 3.6 0.3 % 14.7 2.0 % 1.8 0.2 % Non-deductible transaction costs 0.6 — 14.0 1.9 % — — Global intangible low-taxed income tax, net 0.1 — 0.4 0.1 % (14.5) (1.8 %) Share-based compensation — — (25.2) (3.4 %) (4.6) (0.6 %) Other, net (0.1) 0.1 % 7.8 1.0 % 4.1 0.6 % Income tax expense $ 325.9 24.9 % $ 211.1 28.6 % $ 204.1 24.8 % _____________________ (i) The Company’s Mexican subsidiaries have net U.S. dollar-denominated monetary assets which, for Mexican income tax purposes, are subject to periodic revaluation based on changes in the value of the Mexican peso against the U.S. dollar. This revaluation creates fluctuations in the Company’s Mexican income tax expense in the consolidated statements of income and the amount of income taxes paid in Mexico. The Company also has net monetary assets denominated in Mexican pesos, that are subject to periodic re-measurement and settlement that creates fluctuations in foreign currency gains and losses in the consolidated statements of income. The Company hedges its net exposure to variations in earnings by entering into foreign currency forward contracts. The foreign currency forward contracts involve the Company’s agreement to buy or sell pesos at an agreed-upon exchange rate on a future date. Refer to Note 10, Derivative Instruments for further information.
Schedule of Change in Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows ( in millions ): 2022 2021 Balance at January 1, $ 2.2 $ 2.2 Additions for tax positions of prior years 1.3 — Reductions for settlement with taxing authorities (2.2) — Balance at December 31, $ 1.3 $ 2.2

Stockholder(s)' Equity (Tables)

Stockholder(s)' Equity (Tables)	12 Months Ended
	Dec. 31, 2022
Stockholders' Equity Note [Abstract]
Schedule of Treasury Stock	Shares of common stock in treasury and related activity prior to the merger follow: 2021 2020 Balance at beginning of year 32,305,078 27,236,516 Shares repurchased 233,402 5,350,976 Shares issued to fund stock option exercises (189,775) (133,951) Employee stock purchase plan shares issued (41,338) (51,658) Nonvested shares issued (50,127) (111,003) Nonvested shares forfeited 16,808 14,198 Conversion of restricted shares to cash 25,049 — Recapitalization of equity (32,299,097) — Balance at end of year — 32,305,078
Schedule of Cash Dividends Declared per Common Share	The following table presents the amount of cash dividends declared per common share by the Company’s Board of Directors on the Company’s historical common stock prior to the merger: 2021 2020 Cash dividends declared per common share $ 1.62 $ 1.64

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Schedule of Stock Option Valuation Assumptions	The weighted-average assumptions used were as follows: 2021 2020 Expected dividend yield 0.83 % 1.04 % Expected volatility 30.86 % 26.07 % Risk-free interest rate 0.74 % 1.27 % Expected term (years) 6.0 5.7 Weighted-average grant date fair value of stock options granted $ 58.74 $ 37.79
Schedule of Stock Option Exercise Activity	Additional information regarding stock option exercises appears in the table below (in millions) : 2021 2020 Aggregate grant-date fair value of stock options vested $ 8.5 $ 3.7 Intrinsic value of stock options exercised 34.9 13.9 Cash received from option exercises 19.9 9.9 Tax benefit from options exercised during the annual period 7.8 3.5
Schedule of Employee Stock Purchase Plan Activity	The following table summarizes activity related to the various ESPP offerings: Exercise Date Received Date Purchase Shares January 2021 offering July 1, 2021 $ 170.83 18,046 $ 3.1 July 2020 offering January 5, 2021 $ 122.91 23,292 $ 2.9 January 2020 offering July 2, 2020 $ 126.90 23,709 $ 3.0 _____________________ (i) Represents amounts received from employees through payroll deductions for share purchases under applicable offering.
Schedule of Employee Stock Purchase Plan Valuation Assumptions	The weighted-average assumptions used for each of the respective periods were as follows: Years Ended December 31, 2021 2020 Expected dividend yield 0.88 % 1.07 % Expected volatility 18.65 % 30.55 % Risk-free interest rate 0.05 % 1.01 % Expected term (years) 0.5 0.5 Weighted-average grant date fair value $ 40.40 $ 35.14

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Personal Injury Liability Activity	The personal injury liability activity was as follows (in millions): 2022 2021 Balance at beginning of year $ 32.6 $ 31.3 Accruals 18.3 6.3 Changes in estimate 1.4 (1.4) Payments (15.6) (3.6) Balance at end of year $ 36.7 $ 32.6

Quarterly Financial Data (Una_2

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2022
Quarterly Financial Data [Abstract]
Schedule of Quarterly Financial Information	Fourth Third Second First (In millions, except per share amounts) 2022 Revenues $ 864.5 $ 882.2 $ 845.5 $ 778.2 Operating income (i) 298.2 325.0 312.8 291.1 Net income (ii) 400.0 201.7 194.1 188.0 Net income attributable to Kansas City Southern and subsidiaries 399.4 201.3 194.1 187.4 2021 Revenues $ 747.8 $ 744.0 $ 749.5 $ 706.0 Operating income (loss) (iii) 810.6 251.9 (431.7) 253.0 Net income (loss) 595.1 156.5 (378.0) 153.4 Net income (loss) attributable to Kansas City Southern and subsidiaries 594.5 156.2 (378.5) 153.0 _____________________ (i) During the first, second, third and fourth quarters of 2022, the Company recognized pre-tax net merger costs of $12.8 million, $12.5 million, $11.5 million, and $9.8 million, respectively, related to the Company’s merger with CP. (ii) During the fourth quarter of 2022, the Company recognized the gain on settlement of the interest rate derivative instruments of $259.3 million. Refer to Note 10, Derivative Instruments for more information.

Geographic Information (Tables)

Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	The following tables provide information by geographic area (in millions) : Years ended December 31, 2022 2021 2020 Revenues U.S. $ 1,816.2 $ 1,580.6 $ 1,388.5 Mexico 1,554.2 1,366.7 1,244.1 Total revenues $ 3,370.4 $ 2,947.3 $ 2,632.6 December 31, 2022 2021 Property and equipment (including Concession assets), net U.S. $ 5,885.3 $ 5,744.4 Mexico 3,477.1 3,464.9 Total property and equipment (including Concession assets), net $ 9,362.4 $ 9,209.3

Description of the Business (De

Description of the Business (Details) $ / shares in Units, $ in Millions, $ in Billions				12 Months Ended
	Jul. 14, 2022 MXN ($)	Jul. 14, 2022 USD ($)	Dec. 14, 2021 $ / shares shares	Dec. 31, 2022 $ / shares	Dec. 31, 2021 $ / shares
Description Of The Business [Line Items]
Common stock, par value			$ 0.01	$ 0.01	$ 0.01
Preferred stock, par value			$ 25
KCSM [Member]
Description Of The Business [Line Items]
Percentage of gross revenue payable under railroad Concession to Mexican government				1.25%
Property investment for exclusivity extension under railroad Concession to Mexican government	$ 4	$ 200
Contract extension for exclusivity under railroad Concession to Mexican government	10 years	10 years
KCSM [Member] | Unionized Employees Concentration Risk [Member] | Number of Employees, Total [Member]
Description Of The Business [Line Items]
Percentage of employees covered by collective bargaining or labor agreements				76%
KCSM [Member] | Maximum [Member]
Description Of The Business [Line Items]
Additional Concession renewal period				50 years
KCSR [Member] | Unionized Employees Concentration Risk [Member] | Number of Employees, Total [Member]
Description Of The Business [Line Items]
Percentage of employees covered by collective bargaining or labor agreements				71%
PCRC [Member]
Description Of The Business [Line Items]
Equity investment ownership percentage				50%
TCM [Member]
Description Of The Business [Line Items]
Equity investment ownership percentage				45%
FTVM [Member]
Description Of The Business [Line Items]
Equity investment ownership percentage				25%
PTC-220 [Member]
Description Of The Business [Line Items]
Equity investment ownership percentage				13%
MSLLC [Member]
Description Of The Business [Line Items]
Ownership percentage of MSLLC				70%
Canadian Pacific Railway Limited (CP)
Description Of The Business [Line Items]
Common shares received in exchange for each common share of the Company. | shares			2.884
Cash received, in addition to shares, in exchange for each common share of the Company			$ 90
Cash received in exchange for each preferred share of the Company			37.50
Merger cash and stock transaction, value per common share			$ 301.20

Significant Accounting Polici_3

Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses	$ 12.2	$ 12.1
Bad debt expense	8.7	3.3	$ 1.5
Depreciation and amortization	390.9	365.8	357.9
Write-off of software development costs	0	0	$ 13.6
Other Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill	$ 13.2	$ 13.2
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating and finance leases, remaining lease terms	1 year
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating and finance leases, remaining lease terms	7 years
Depreciable Assets Depreciation Rate [Member] | KCSR [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Depreciation and amortization	$ 12

Merger Agreement (Details)

Merger Agreement (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended								12 Months Ended
	Dec. 14, 2021	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Merger Agreement [Line Items]
Common stock, par value	$ 0.01	$ 0.01				$ 0.01				$ 0.01	$ 0.01
Preferred stock, par value	$ 25
Cash dividend										$ 880	$ 188	$ 152.3
Merger costs, net		$ 9.8	$ 11.5	$ 12.5	$ 12.8	$ (512.6)	$ 36.5	$ 720.8	$ 19.3	$ 46.6	$ 264	$ 0
Canadian Pacific Railway Limited (CP)
Merger Agreement [Line Items]
Common shares received in exchange for each common share of the Company.	2.884
Cash received, in addition to shares, in exchange for each common share of the Company	$ 90
Cash received in exchange for each preferred share of the Company	37.50
Merger cash and stock transaction, value per common share	$ 301.20

Restructuring Charges (Narrativ

Restructuring Charges (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Asset Impairment and Restructuring Costs [Line Items]
Restructuring charges	$ 0	$ 0	$ 17
Workforce Reduction [Member]
Asset Impairment and Restructuring Costs [Line Items]
Restructuring charges			9.7
Asset Impairments [Member]
Asset Impairment and Restructuring Costs [Line Items]
Restructuring charges			$ 7.3

Leases Lease Assets and Liabili

Leases Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Assets
Operating	$ 100.9	$ 69.6
Finance	$ 17.8	$ 13.9
Finance lease, right-of-use asset	Property and equipment (including concession assets), net	Property and equipment (including concession assets), net
Total leased assets	$ 118.7	$ 83.5
Liabilities, Current
Operating	$ 28.8	$ 22.3
Operating lease liability, current	Accounts Payable and Accrued Liabilities, Current	Accounts Payable and Accrued Liabilities, Current
Finance	$ 6.3	$ 4.5
Finance lease liability, current	Long-term debt due within one year	Long-term debt due within one year
Liabilities, Noncurrent
Operating	$ 71.5	$ 46.4
Finance	$ 12.4	$ 10.9
Finance lease liability, noncurrent	Long-term debt	Long-term debt
Total lease liabilities	$ 119	$ 84.1

Leases Components of Lease Expe

Leases Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lease Cost [Line Items]
Total lease cost	$ 29.9	$ 27.7	$ 30.8
Equipment costs [Member]
Lease Cost [Line Items]
Operating lease cost	20.8	19.6	23.3
Materials and other [Member]
Lease Cost [Line Items]
Operating lease cost	5.7	5.8	5
Depreciation and amortization [Member]
Lease Cost [Line Items]
Amortization of finance lease assets	2.8	1.7	1.6
Interest expense [Member]
Lease Cost [Line Items]
Interest on lease liabilities	$ 0.6	$ 0.6	$ 0.9

Leases Cash Flow Information (D

Leases Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Cash paid for operating leases included in operating activities	$ 32.5	$ 29.4	$ 45.6
Cash paid for finance leases included in operating activities	0.7	0.8	0.9
Cash paid for finance leases included in financing activities	5.9	3.5	2
Right-of-use assets obtained in exchange for operating lease liabilities	58.9	32.9	18.4
Right-of-use assets obtained in exchange for financing lease liabilities	$ 9.2	$ 11.5	$ 0.8

Leases Lease Term and Discount

Leases Lease Term and Discount Rate (Details)	Dec. 31, 2022	Dec. 31, 2021
Weighted-Average Remaining Lease Term
Operating leases	4 years 2 months 12 days	4 years 2 months 12 days
Finance leases	3 years 7 months 6 days	3 years 9 months 18 days
Weighted-Average Discount Rate
Operating leases	2.90%	2.20%
Finance leases	3.50%	5.10%

Leases Remaining Maturities of

Leases Remaining Maturities of Lease Liabilities (Details) $ in Millions	Dec. 31, 2022 USD ($)
Operating Leases
2023	$ 29.7
2024	25.6
2025	18.9
2026	17
2027	9.5
Thereafter	3.5
Total lease payments	104.2
Less imputed interest	3.9
Total	100.3
Finance Leases
2023	6.8
2024	4.5
2025	4.2
2026	3.6
2027	0.4
Thereafter	0
Total lease payments	19.5
Less imputed interest	0.8
Total	$ 18.7

Revenue Disaggregation of Reven

Revenue Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 864.5	$ 882.2	$ 845.5	$ 778.2	$ 747.8	$ 744	$ 749.5	$ 706	$ 3,370.4	$ 2,947.3	$ 2,632.6
Freight Revenues [Member]
Disaggregation of Revenue [Line Items]
Revenues									3,189.4	2,797.4	2,493.7
Chemical and Petroleum [Member]
Disaggregation of Revenue [Line Items]
Revenues									783.5	851.8	763.8
Chemicals [Member]
Disaggregation of Revenue [Line Items]
Revenues									291.9	263.5	236.7
Petroleum [Member]
Disaggregation of Revenue [Line Items]
Revenues									324.8	442.1	375
Plastics [Member]
Disaggregation of Revenue [Line Items]
Revenues									166.8	146.2	152.1
Industrial and Consumer Products [Member]
Disaggregation of Revenue [Line Items]
Revenues									710.6	589.6	537.7
Forest Products [Member]
Disaggregation of Revenue [Line Items]
Revenues									295.8	261.8	247.8
Metals and Scrap [Member]
Disaggregation of Revenue [Line Items]
Revenues									257.3	204.9	188.4
Other Industrial and Consumer Products [Member]
Disaggregation of Revenue [Line Items]
Revenues									157.5	122.9	101.5
Agriculture and Minerals [Member]
Disaggregation of Revenue [Line Items]
Revenues									682	571.7	505.4
Grain [Member]
Disaggregation of Revenue [Line Items]
Revenues									432.5	358.6	299.6
Food Products [Member]
Disaggregation of Revenue [Line Items]
Revenues									175.1	152.3	154.6
Ores and Minerals [Member]
Disaggregation of Revenue [Line Items]
Revenues									33.5	25.9	21.8
Stone, Clay and Glass [Member]
Disaggregation of Revenue [Line Items]
Revenues									40.9	34.9	29.4
Energy [Member]
Disaggregation of Revenue [Line Items]
Revenues									305.2	254.8	195
Utility Coal [Member]
Disaggregation of Revenue [Line Items]
Revenues									165.3	148.5	105.6
Coal and Petroleum Coke [Member]
Disaggregation of Revenue [Line Items]
Revenues									49.2	47.3	41.8
Frac Sand [Member]
Disaggregation of Revenue [Line Items]
Revenues									18.3	15.6	11.3
Crude Oil [Member]
Disaggregation of Revenue [Line Items]
Revenues									72.4	43.4	36.3
Intermodal [Member]
Disaggregation of Revenue [Line Items]
Revenues									449.7	346.3	319.1
Automotive [Member]
Disaggregation of Revenue [Line Items]
Revenues									258.4	183.2	172.7
Other Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 181	$ 149.9	$ 138.9

Revenue Narrative (Details)

Revenue Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Amount of revenue recognized from performace obligations partially satisfied in previous year	$ 17.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Accounts receivable, net	543.6	$ 271
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations that were unsatisfied or partially satisfied	$ 25.8
Performance obligations that were unsatisfied or partially satisfied, expected timing of satisfaction	1 month

Revenue Changes in Contract Lia

Revenue Changes in Contract Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Contract Liabilities [Roll Forward]
Beginning balance	$ 68.4	$ 29.9
Revenue recognized that was included in the contract liability balance at the beginning of the period	(34.1)	(29.7)
Increases due to consideration received, excluding amounts recognized as revenue during the period	29.8	68.2
Ending balance	$ 64.1	$ 68.4

Property and Equipment (inclu_3

Property and Equipment (including Concession Assets) Schedule of Property and Equipment (including Concession Assets) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Cost		$ 12,854.8	$ 12,365.5
Accumulated Depreciation		(3,492.4)	(3,156.2)
Net Book Value		9,362.4	9,209.3
Land [Member]
Property, Plant and Equipment [Line Items]
Cost		244.7	243
Accumulated Depreciation		0	0
Net Book Value		244.7	243
Concession land rights [Member]
Property, Plant and Equipment [Line Items]
Cost		141.1	141.1
Accumulated Depreciation		(33.6)	(32.2)
Net Book Value		$ 107.5	$ 108.9
Depreciation Rates		1%	1%
Road property [Member]
Property, Plant and Equipment [Line Items]
Cost		$ 8,809.4	$ 8,430.6
Accumulated Depreciation		(2,178.7)	(2,012.4)
Net Book Value		$ 6,630.7	$ 6,418.2
Depreciation Rates		2.70%	2.60%
Rail and other track material [Member]
Property, Plant and Equipment [Line Items]
Cost		$ 2,394.8	$ 2,240.6
Accumulated Depreciation		(454.3)	(417.7)
Net Book Value		$ 1,940.5	$ 1,822.9
Rail and other track material [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation Rates		1.90%	1.80%
Rail and other track material [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation Rates		3.60%	3.60%
Ties [Member]
Property, Plant and Equipment [Line Items]
Cost		$ 1,868	$ 1,790
Accumulated Depreciation		(475.8)	(435.6)
Net Book Value		$ 1,392.2	$ 1,354.4
Ties [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation Rates		1.40%	1.40%
Ties [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation Rates		5.40%	5.40%
Grading [Member]
Property, Plant and Equipment [Line Items]
Cost		$ 1,013.1	$ 1,006.8
Accumulated Depreciation		(210.8)	(200.3)
Net Book Value		$ 802.3	$ 806.5
Depreciation Rates		1%	1%
Bridges and tunnels [Member]
Property, Plant and Equipment [Line Items]
Cost		$ 940.8	$ 884.1
Accumulated Depreciation		(192.3)	(181)
Net Book Value		$ 748.5	$ 703.1
Depreciation Rates		1.30%	1.30%
Ballast [Member]
Property, Plant and Equipment [Line Items]
Cost		$ 940.2	$ 898.6
Accumulated Depreciation		(277.8)	(258.2)
Net Book Value		$ 662.4	$ 640.4
Ballast [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation Rates		2.20%	2.20%
Ballast [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation Rates		4.40%	4.40%
Other road property [Member]
Property, Plant and Equipment [Line Items]
Cost	[1]	$ 1,652.5	$ 1,610.5
Accumulated Depreciation	[1]	(567.7)	(519.6)
Net Book Value	[1]	$ 1,084.8	$ 1,090.9
Depreciation Rates	[1]	3%	2.70%
Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost		$ 2,904.2	$ 2,842.4
Accumulated Depreciation		(944.5)	(820.9)
Net Book Value		$ 1,959.7	$ 2,021.5
Depreciation Rates		4.30%	3.70%
Locomotives [Member]
Property, Plant and Equipment [Line Items]
Cost		$ 1,826.2	$ 1,777.2
Accumulated Depreciation		(637)	(546.6)
Net Book Value		$ 1,189.2	$ 1,230.6
Depreciation Rates		5%	4.50%
Freight cars [Member]
Property, Plant and Equipment [Line Items]
Cost		$ 995	$ 974.2
Accumulated Depreciation		(266.4)	(234.4)
Net Book Value		$ 728.6	$ 739.8
Depreciation Rates		2.90%	2.20%
Other equipment [Member]
Property, Plant and Equipment [Line Items]
Cost		$ 83	$ 91
Accumulated Depreciation		(41.1)	(39.9)
Net Book Value		$ 41.9	$ 51.1
Depreciation Rates		5.20%	5%
Technology and other [Member]
Property, Plant and Equipment [Line Items]
Cost		$ 453.7	$ 372.6
Accumulated Depreciation		(335.6)	(290.7)
Net Book Value		$ 118.1	$ 81.9
Depreciation Rates		10.90%	15.60%
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Cost		$ 301.7	$ 335.8
Accumulated Depreciation		0	0
Net Book Value		$ 301.7	$ 335.8
[1]Other includes signals, buildings and other road assets.

Property and Equipment (inclu_4

Property and Equipment (including Concession Assets) (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Accumulated amortization	$ 797.3	$ 744.8
Concession assets, net of accumulated amortization	2,472	2,459.3
Depreciation and amortization	390.9	365.8	$ 357.9
Cumulative government assistance, net	34.8	37.3
Government assistance amortization	2.5
Write-off of software development costs	$ 0	$ 0	$ 13.6

Other Balance Sheet Captions Ot

Other Balance Sheet Captions Other Current Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Balance Sheet Captions [Abstract]
Prepaid expenses	$ 28.4	$ 25.8
Refundable Mexican value added tax	78.9	78
Prepaid income taxes	14.3	19
Advances to affiliates	8.8	9
Other	8.4	10.3
Other current assets	$ 138.8	$ 142.1

Other Balance Sheet Captions Ac

Other Balance Sheet Captions Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Balance Sheet Captions [Abstract]
Accounts payable	$ 207.2	$ 169.7
Accrued wages and vacation	128.4	103.7
Accrued merger costs	55.8	37.3
Income and other taxes	41.9	37
Foreign currency forward contracts	41	1.8
Contract liabilities	31.3	30
Short-term operating lease liability	28.8	22.3
Interest payable	26.2	26.2
Derailments, personal injury and other claim provisions	25.1	27.5
Accrued rents and leases	13.3	7.7
Other	36.7	16.5
Accounts payable and accrued liabilities	$ 635.7	$ 479.7
Short-term operating lease liability	Accounts payable and accrued liabilities	Accounts payable and accrued liabilities

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of Company's debt	$ 3,779.6	$ 3,777.6
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt instruments	3,308.3	4,311.1
Treasury Lock Agreements [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of treasury lock agreements, assets	0	57.4
Foreign Currency Derivative Instruments [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of foreign currency derivative instruments, liabilities	$ 41	$ 1.8

Derivative Instruments Interest

Derivative Instruments Interest Rate Derivative Instruments (Details) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	May 31, 2017 USD ($) Treasury_Lock_Agreements	Dec. 31, 2022 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) Treasury_Lock_Agreements
Derivative [Line Items]
Term of future forecasted debt issuance						30 years
Long-term debt instrument, gross		$ 3,802.4		$ 3,802.4
Gain on settlement of treasury lock agreements		259.3		259.3	$ 0	$ 0
Senior Notes [Member] | 3.00% Senior Notes due May 15, 2023 [Member]
Derivative [Line Items]
Long-term debt instrument, gross		$ 444.7		$ 444.7
Debt instrument, stated interest rate		3%		3%
Debt instrument, maturity date				May 15, 2023
Senior Notes [Member] | 3.85% Senior Notes due November 15, 2023 [Member]
Derivative [Line Items]
Long-term debt instrument, gross		$ 200		$ 200
Debt instrument, stated interest rate		3.85%		3.85%
Debt instrument, maturity date				Nov. 15, 2023
Senior Notes [Member] | 2.35% Senior Notes due May 15, 2020 [Member]
Derivative [Line Items]
Long-term debt instrument, gross	$ 275
Debt instrument, stated interest rate	2.35%
Debt instrument, maturity date	May 15, 2020
Senior Notes [Member] | 2.875% Senior Notes due November 15, 2029 [Member] | KCS [Member]
Derivative [Line Items]
Debt instrument, stated interest rate			2.875%
Debt instrument, maturity date			Nov. 15, 2029
Debt instrument, face amount			$ 425
Debt instrument, interest rate effective percentage after effect of cash flow hedge			3.60%
Treasury Lock Agreements [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Number of treasury lock agreements executed | Treasury_Lock_Agreements	4					6
Aggregate notional value of treasury lock agreements	$ 275					$ 650
Weighted-average interest rate of treasury lock agreements	2.85%					1.58%
Gain on settlement of treasury lock agreements		$ 259.3
Cash paid for settlement of treasury lock agreements			$ 25.8

Derivative Instruments Summary

Derivative Instruments Summary of Foreign Currency Derivative Contracts (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) $ / $	Dec. 31, 2021 USD ($) $ / $	Dec. 31, 2020 USD ($) $ / $	Dec. 31, 2022 MXN ($) $ / $	Dec. 31, 2021 MXN ($) $ / $	Dec. 31, 2020 MXN ($) $ / $	Dec. 31, 2019 USD ($) $ / $	Dec. 31, 2019 MXN ($) $ / $
Derivative [Line Items]
Cash received (paid) on settlement of foreign currency contracts | $	$ (5.1)	$ (1.9)	$ (20)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Sell Ps./Receive USD [Member] | Contracts Executed in 2022 and Outstanding [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts	$ 535			$ 11,235.2
Weighted-average exchange rate of foreign currency forward contracts	21			21
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Sell Ps./Receive USD [Member] | Contracts Executed in 2022 and Settled in 2022 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts	$ 110			$ 2,348.4
Weighted-average exchange rate of foreign currency forward contracts	21.3			21.3
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Sell Ps./Receive USD [Member] | Contracts Executed in 2022 and Settled in 2022 [Member] | Foreign Exchange Gain (Loss) [Member]
Derivative [Line Items]
Cash received (paid) on settlement of foreign currency contracts | $	$ (3.4)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Sell Ps./Receive USD [Member] | Contracts Executed in 2021 and Settled in 2022 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts		$ 270			$ 5,583.3
Weighted-average exchange rate of foreign currency forward contracts		20.7			20.7
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Sell Ps./Receive USD [Member] | Contracts Executed in 2021 and Settled in 2022 [Member] | Foreign Exchange Gain (Loss) [Member]
Derivative [Line Items]
Cash received (paid) on settlement of foreign currency contracts | $	(1.7)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Sell Ps./Receive USD [Member] | Contracts Executed in 2020 and Settled in 2020 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts			$ 75			$ 1,555.5
Weighted-average exchange rate of foreign currency forward contracts			20.7			20.7
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Sell Ps./Receive USD [Member] | Contracts Executed in 2020 and Settled in 2020 [Member] | Foreign Exchange Gain (Loss) [Member]
Derivative [Line Items]
Cash received (paid) on settlement of foreign currency contracts | $			$ (2.9)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Offsetting Contracts to Purchase Ps./Pay USD [Member] | Contracts Executed in 2022 and Settled in 2022 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts	$ 113.4			$ 2,348.4
Weighted-average exchange rate of foreign currency forward contracts	20.7			20.7
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Offsetting Contracts to Purchase Ps./Pay USD [Member] | Contracts Executed in 2021 and Settled in 2022 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts	$ 271.7			$ 5,583.3
Weighted-average exchange rate of foreign currency forward contracts	20.6			20.6
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Offsetting Contracts to Purchase Ps./Pay USD [Member] | Contracts Executed in 2020 and Settled in 2020 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts			$ 78			$ 1,555.5
Weighted-average exchange rate of foreign currency forward contracts			20			20
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Purchase Ps./Pay USD [Member] | Contracts Executed in 2020 and Settled in 2020 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts			$ 555			$ 11,254.3
Weighted-average exchange rate of foreign currency forward contracts			20.3			20.3
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Purchase Ps./Pay USD [Member] | Contracts Executed in 2020 and Settled in 2020 [Member] | Foreign Exchange Gain (Loss) [Member]
Derivative [Line Items]
Cash received (paid) on settlement of foreign currency contracts | $			$ (20.7)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Purchase Ps./Pay USD [Member] | Contracts executed in 2021 and settled in 2021 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts		$ 100			$ 1,993.5
Weighted-average exchange rate of foreign currency forward contracts		19.9			19.9
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Purchase Ps./Pay USD [Member] | Contracts executed in 2021 and settled in 2021 [Member] | Foreign Exchange Gain (Loss) [Member]
Derivative [Line Items]
Cash received (paid) on settlement of foreign currency contracts | $		$ (1.9)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Purchase Ps./Pay USD [Member] | Contracts Executed in 2019 and Settled in 2020 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts							$ 105	$ 2,041.2
Weighted-average exchange rate of foreign currency forward contracts							19.4	19.4
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Purchase Ps./Pay USD [Member] | Contracts Executed in 2019 and Settled in 2020 [Member] | Foreign Exchange Gain (Loss) [Member]
Derivative [Line Items]
Cash received (paid) on settlement of foreign currency contracts | $			3.6
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Offsetting Contracts to Sell Ps./Receive USD [Member] | Contracts Executed in 2020 and Settled in 2020 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts			$ 534.3			$ 11,254.3
Weighted-average exchange rate of foreign currency forward contracts			21.1			21.1
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Offsetting Contracts to Sell Ps./Receive USD [Member] | Contracts executed in 2021 and settled in 2021 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts		$ 98.1			$ 1,993.5
Weighted-average exchange rate of foreign currency forward contracts		20.3			20.3
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Offsetting Contracts to Sell Ps./Receive USD [Member] | Contracts Executed in 2019 and Settled in 2020 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts			$ 108.6			$ 2,041.2
Weighted-average exchange rate of foreign currency forward contracts			18.8			18.8

Derivative Instruments Fair Val

Derivative Instruments Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	$ 0	$ 57.4
Derivative liabilities, fair value	$ 41	$ 1.8
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accounts payable and accrued liabilities	Accounts payable and accrued liabilities
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	$ 0	$ 57.4
Designated as Hedging Instrument [Member] | Treasury Lock Agreements [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	0	57.4
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	41	1.8
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	$ 41	$ 1.8

Derivative Instruments Offsetti

Derivative Instruments Offsetting of Derivative Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Offsetting of Derivative Liabilities [Abstract]
Gross derivative liabilities, fair value	$ 41	$ 2.8
Gross offsetting derivative assets, fair value	0	(1)
Net derivative liabilities presented in the consolidated balance sheets, fair value	$ 41	$ 1.8

Derivative Instruments Derivati

Derivative Instruments Derivative Instruments Affecting the Consolidated Statements of Income and Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
OCI, Cash Flow Hedge, Reclassification for Discontinuance, Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain on settlement of treasury lock agreements	Gain on settlement of treasury lock agreements	Gain on settlement of treasury lock agreements
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Foreign exchange loss	Foreign exchange loss	Foreign exchange loss
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in OCI on Derivative	$ 201.9	$ 21.8	$ 35.6
Amount of Gain/(Loss) Reclassified from AOCI into Income	256.9	(2.5)	(2.4)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Treasury Lock Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in OCI on Derivative	201.9	21.8	35.6
Amount of Gain/(Loss) Reclassified from AOCI into Income, Gain On Settlement Of Treasury Lock Agreements	259.3	0	0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Treasury Lock Agreements [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Reclassified from AOCI into Income, Interest Expense	(2.4)	(2.5)	(2.4)
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	(44.3)	(3.7)	(22.5)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	$ (44.3)	$ (3.7)	$ (22.5)

Short-Term Borrowings (Details)

Short-Term Borrowings (Details) - KCS [Member] - Commercial Paper [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Short-term Borrowings [Line Items]
Amount of commercial paper outstanding	$ 0	$ 0
Maximum [Member]
Short-term Borrowings [Line Items]
Commercial paper, days outstanding	90 days	90 days	90 days

Long-Term Debt Schedule of Long

Long-Term Debt Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Feb. 21, 2012
Debt Instrument [Line Items]
Long-term debt instrument, gross	$ 3,802.4
Unamortized discount and debt issuance costs	41.5	$ 44.5
Finance lease obligations	18.7
Total, gross	3,821.1	3,822.1
Total	3,779.6	3,777.6
Less: Debt due within one year, gross	655.5	8.8
Unamortized discount and debt issuance costs, current	0.5	0
Less: Debt due within one year	655	8.8
Long-term debt, gross	3,165.6	3,813.3
Unamortized discount and debt issuance costs, noncurrent	41	44.5
Long-term debt	3,124.6	3,768.8
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	0	0
Unamortized discount and debt issuance costs	0	0
Long-term debt instrument	0	0
Senior Notes [Member] | KCSR [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	2.7	2.7
Unamortized discount and debt issuance costs	0	0
Long-term debt instrument	$ 2.7	2.7
Senior Notes [Member] | KCSR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	3.85%
Senior Notes [Member] | KCSR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.95%
Senior Notes [Member] | KCSM [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	$ 5.6	5.6
Unamortized discount and debt issuance costs	0	0
Long-term debt instrument	$ 5.6	5.6
Debt instrument, stated interest rate	3%
Senior Notes [Member] | KCS [Member] | 3.00% senior notes due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	$ 439.1	439.1
Unamortized discount and debt issuance costs	0.3	1
Long-term debt instrument	$ 438.8	438.1
Debt instrument, stated interest rate	3%
Senior Notes [Member] | KCS [Member] | 3.85% senior notes due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	$ 199.2	199.2
Unamortized discount and debt issuance costs	0.2	0.5
Long-term debt instrument	$ 199	198.7
Debt instrument, stated interest rate	3.85%
Senior Notes [Member] | KCS [Member] | 3.125% senior notes due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	$ 250	250
Unamortized discount and debt issuance costs	1.3	1.7
Long-term debt instrument	$ 248.7	248.3
Debt instrument, stated interest rate	3.125%
Senior Notes [Member] | KCS [Member] | 2.875% senior notes due 2029 [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	$ 425	425
Unamortized discount and debt issuance costs	3	3.4
Long-term debt instrument	$ 422	421.6
Debt instrument, stated interest rate	2.875%
Senior Notes [Member] | KCS [Member] | 4.30% senior notes due 2043 [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	$ 448.7	448.7
Unamortized discount and debt issuance costs	7.8	8.1
Long-term debt instrument	$ 440.9	440.6
Debt instrument, stated interest rate	4.30%
Senior Notes [Member] | KCS [Member] | 4.95% senior notes due 2045 [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	$ 499.2	499.2
Unamortized discount and debt issuance costs	6.4	6.7
Long-term debt instrument	$ 492.8	492.5
Debt instrument, stated interest rate	4.95%
Senior Notes [Member] | KCS [Member] | 4.70% senior notes due 2048 [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	$ 500	500
Unamortized discount and debt issuance costs	5.4	5.6
Long-term debt instrument	$ 494.6	494.4
Debt instrument, stated interest rate	4.70%
Senior Notes [Member] | KCS [Member] | 3.50% senior notes due 2050 [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	$ 550	550
Unamortized discount and debt issuance costs	10.1	10.4
Long-term debt instrument	$ 539.9	539.6
Debt instrument, stated interest rate	3.50%
Senior Notes [Member] | KCS [Member] | 4.20% senior notes due 2069 [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	$ 425	425
Unamortized discount and debt issuance costs	6.7	6.8
Long-term debt instrument	$ 418.3	418.2
Debt instrument, stated interest rate	4.20%
Secured Debt [Member] | RRIF loans due serially through 2037 [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	$ 57.7	62
Unamortized discount and debt issuance costs	0.3	0.3
Long-term debt instrument	$ 57.4	61.7
Secured Debt [Member] | RRIF loans due serially through 2037 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	2.96%
Secured Debt [Member] | RRIF loans due serially through 2037 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.29%
Secured Debt [Member] | RRIF loans due serially through 2037 [Member] | KCSR [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate			2.96%
Finance Lease Obligations [Member]
Debt Instrument [Line Items]
Finance lease obligations	$ 18.7	15.4
Other Debt Obligations [Member]
Debt Instrument [Line Items]
Long-term debt instrument, gross	0.2	0.2
Unamortized discount and debt issuance costs	0	0
Long-term debt instrument	$ 0.2	$ 0.2

Long-Term Debt Revolving Credit

Long-Term Debt Revolving Credit Facility (Details) - KCS [Member] - Revolving Credit Facility [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 600
Revolving credit facility maturity date	Mar. 08, 2024
Outstanding borrowings under the revolving credit facility	$ 0	$ 0
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Margin KCS pays or would pay above the LIBOR	1.25%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Margin KCS pays or would pay above the LIBOR	1%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Margin KCS pays or would pay above the LIBOR	1.75%
Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 25

Long-Term Debt Senior Notes (De

Long-Term Debt Senior Notes (Details) - Senior Notes [Member]	12 Months Ended
	Dec. 31, 2022
Debt Instrument [Line Items]
Redemption option senior notes, price expressed as a percent of principal amount	100%
KCSM [Member]
Debt Instrument [Line Items]
Additional redemption option KCSM senior notes, price expressed as percent of principal amount	100%

Long-Term Debt RRIF Loan Agreem

Long-Term Debt RRIF Loan Agreements (Details) - Secured Debt [Member] - RRIF Loan Agreement [Member] $ in Millions	Feb. 21, 2012 USD ($) locomotives	Jun. 28, 2005 USD ($)
KCSR [Member]
Debt Instrument [Line Items]
Principal amount of debt	$ 54.6
Number of new locomotives acquired | locomotives	30
Debt instrument, stated interest rate	2.96%
Debt instrument, maturity date	Feb. 24, 2037
Tex Mex [Member]
Debt Instrument [Line Items]
Principal amount of debt		$ 50
Debt instrument, stated interest rate		4.29%
Debt instrument, maturity date		Jul. 13, 2030

Long-Term Debt Leases and Debt

Long-Term Debt Leases and Debt Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Long-Term Debt
Long-Term Debt, Payments Due in 2023	$ 649.2
Long-Term Debt, Payments Due in 2024	4.6
Long-Term Debt, Payments Due in 2025	5
Long-Term Debt, Payments Due in 2026	255
Long-Term Debt, Payments Due in 2027	5.2
Long-Term Debt, Payments Due Thereafter	2,883.4
Total Long-Term Debt	3,802.4
Finance Leases, Net Present Value [Abstract]
Finance Leases, Net Present Value, Payments Due in 2023	6.3
Finance Leases, Net Present Value, Payments Due in 2024	4.3
Finance Leases, Net Present Value, Payments Due in 2025	4.1
Finance Leases, Net Present Value, Payments Due in 2026	3.6
Finance Leases, Net Present Value, Payments Due in 2027	0.4
Finance Leases, Net Present Value, Payments Due Thereafter	0
Total Finance Leases, Net Present Value	18.7
Long Term Debt And Finance Lease Obligation [Abstract]
Total Debt, Payments Due in 2023	655.5
Total Debt, Payments Due in 2024	8.9
Total Debt, Payments Due in 2025	9.1
Total Debt, Payments Due in 2026	258.6
Total Debt, Payments Due in 2027	5.6
Total Debt, Payments Due Thereafter	2,883.4
Total Debt, Payments Due	$ 3,821.1	$ 3,822.1

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) $ in Millions, $ in Billions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2022 MXN ($)	Aug. 31, 2022 USD ($)	Aug. 31, 2022 MXN ($)	Dec. 31, 2021 USD ($)
KCSM [Member]
Income Tax Disclosure [Line Items]
Performance bond posted			$ 291	$ 5.6
Refundable Mexican value added tax	$ 78.9				$ 152.2
KCSM [Member] | Short-Term Asset [Member]
Income Tax Disclosure [Line Items]
Refundable Mexican value added tax	$ 78.9				$ 78
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Income Tax Disclosure [Line Items]
Percent dividends received deduction	100%
State and Local Jurisdiction [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryover, amount	$ 64.9
Net operating loss carryover, deferred tax asset, state and local	$ 7.2
State and Local Jurisdiction [Member] | Minimum [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryover, period	10 years
Foreign Tax Authority [Member] | Servicio de Administración Tributaria (SAT) [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryover, amount	$ 27
Net operating loss carryover, deferred tax asset, foreign	7.9
Foreign Tax Authority [Member] | Servicio de Administración Tributaria (SAT) [Member] | KCSM [Member] | Tax Year 2014
Income Tax Disclosure [Line Items]
Audit assessment issued by the Mexican tax authority	$ 296	$ 5.7

Income Taxes Schedule of Income

Income Taxes Schedule of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 88.4	$ 18.1	$ (1.9)
State and local	8.2	2.7	1.6
Foreign	194.3	167.1	155
Total current	290.9	187.9	154.7
Deferred:
Federal	52.7	21.2	49.4
State and local	(3.3)	(1.6)	13.8
Foreign	(14.4)	3.6	(13.8)
Total deferred	35	23.2	49.4
Total income tax expense	$ 325.9	$ 211.1	$ 204.1

Income Taxes Schedule of Inco_2

Income Taxes Schedule of Income Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
U.S.	$ 662.1	$ 148.6	$ 329
Foreign	647.6	589.5	494.2
Income before income taxes	$ 1,309.7	$ 738.1	$ 823.2

Income Taxes Schedule of Deferr

Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Assets:
Reserves not currently deductible for tax	$ 65.5	$ 42.5
Compensation and benefits	32	28
Lease liability	26.9	19.4
Tax credit and loss carryovers	14.8	26.4
Other	26.5	6.5
Gross deferred tax assets before valuation allowance	165.7	122.8
Valuation allowance	(2.1)	(7.3)
Net deferred tax assets	163.6	115.5
Liabilities:
Property	(1,317.1)	(1,253)
Investments	(57.9)	(56)
Other	(25.7)	(20.2)
Gross deferred tax liabilities	(1,400.7)	(1,329.2)
Net deferred tax liability	$ (1,237.1)	$ (1,213.7)

Income Taxes Schedule of Effect

Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense using the statutory rate in effect		$ 275	$ 155	$ 172.9
Tax effect of:
Difference between U.S. and foreign tax rate		57.4	51.9	44.1
Inflation		(25.8)	(10.4)	(4.9)
Tax credits		(11.9)	(11.7)	(13.8)
Foreign exchange	[1]	9.4	5.9	(3.4)
State and local income tax provision, net		9.1	0.2	12.5
Withholding tax		8.5	8.5	9.9
Non-deductible executive compensation		3.6	14.7	1.8
Non-deductible transaction costs		0.6	14	0
Global intangible low-taxed income tax, net		0.1	0.4	(14.5)
Share-based compensation		0	(25.2)	(4.6)
Other, net		(0.1)	7.8	4.1
Total income tax expense		$ 325.9	$ 211.1	$ 204.1
U.S. federal statutory income tax rate		21%	21%	21%
Tax rate effect of:
Difference between U.S. and foreign tax rate		4.40%	7%	5.40%
Inflation		(2.00%)	(1.40%)	(0.60%)
Tax credits		(0.90%)	(1.60%)	(1.70%)
Foreign exchange	[1]	0.70%	0.80%	(0.40%)
State and local income tax provision, net		0.70%	0%	1.50%
Withholding tax		0.60%	1.20%	1.20%
Non-deductible executive compensation		0.30%	2%	0.20%
Non-deductible transaction costs		0%	1.90%	0%
Global intangible low-taxed income tax, net		0%	0.10%	(1.80%)
Share-based compensation		0%	(3.40%)	(0.60%)
Other, net		0.10%	1%	0.60%
Effective income tax rate		24.90%	28.60%	24.80%
[1]The Company’s Mexican subsidiaries have net U.S. dollar-denominated monetary assets which, for Mexican income tax purposes, are subject to periodic revaluation based on changes in the value of the Mexican peso against the U.S. dollar. This revaluation creates fluctuations in the Company’s Mexican income tax expense in the consolidated statements of income and the amount of income taxes paid in Mexico. The Company also has net monetary assets denominated in Mexican pesos, that are subject to periodic re-measurement and settlement that creates fluctuations in foreign currency gains and losses in the consolidated statements of income. The Company hedges its net exposure to variations in earnings by entering into foreign currency forward contracts. The foreign currency forward contracts involve the Company’s agreement to buy or sell pesos at an agreed-upon exchange rate on a future date. Refer to Note 10, Derivative Instruments for further information.

Income Taxes Uncertain Tax Posi

Income Taxes Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits [Rollforward]
Balance at January 1,	$ 2.2	$ 2.2
Additions for tax positions of prior years	1.3	0
Reductions for settlement with taxing authorities	(2.2)	0
Balance at December 31,	1.3	2.2
Accrued interest, inflation and penalties on unrecognized tax benefits	2.6	0.1
Interest, inflation and penalty expense on unrecognized tax benefits	$ 2.6	$ 0.1

Stockholder(s)' Equity Capital

Stockholder(s)' Equity Capital Stock Shares Authorized, Issued and Outstanding (Details) - $ / shares	Dec. 31, 2022	Dec. 31, 2021	Dec. 14, 2021
Class of Stock [Line Items]
Common Stock, Shares Authorized	100	100
Common Stock, Shares Issued	100	100
Common Stock, Shares Outstanding	100	100
Common Stock, Par Value	$ 0.01	$ 0.01	$ 0.01

Stockholder(s)' Equity Merger A

Stockholder(s)' Equity Merger Agreement (Details) - Common Stock [Member] - Surviving Merger Sub [Member]	Dec. 14, 2021 $ / shares shares
Class of Stock [Line Items]
Common stock, shares issued, recapitalization	100
Common stock, shares outstanding, recapitalization	100
Common stock, par or stated value per share, recapitalization | $ / shares	$ 0.01

Stockholder(s)' Equity Treasury

Stockholder(s)' Equity Treasury Stock (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items]
Balance at beginning of year	32,305,078	27,236,516
Shares repurchased	233,402	5,350,976
Shares issued to fund stock option exercises	(189,775)	(133,951)
Employee stock purchase plan shares issued	(41,338)	(51,658)
Nonvested shares issued	(50,127)	(111,003)
Nonvested shares forfeited	16,808	14,198
Conversion of restricted shares to cash	25,049
Recapitalization of equity	(32,299,097)
Balance at end of year	0	32,305,078

Stockholder(s)' Equity Cash Div

Stockholder(s)' Equity Cash Dividends to Canadian Pacific (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Equity [Abstract]
Dividends	$ 880

Stockholder(s)' Equity Cash D_2

Stockholder(s)' Equity Cash Dividends on Common Stock (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Cash dividends declared per common share	$ 1.62	$ 1.64

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended	11 Months Ended
	Dec. 14, 2021	Mar. 21, 2021	Dec. 31, 2021	Dec. 13, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional cost recognized on share-based awards for acceleration of vesting and increase in fair value of awards			$ 55.9
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash award to be received for each share award replaced	$ 301.20
Performance Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash award to be received for each share award replaced	$ 301.20
Performance based award, earned percentage	200%
Performance Based Awards [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based award, earned percentage				0%
2017 Equity Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized		64,051
2017 Equity Incentive Plan [Member] | Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		1 year

Share-Based Compensation, Stock

Share-Based Compensation, Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended	11 Months Ended	12 Months Ended
	Dec. 14, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 13, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional cost recognized on share-based awards for acceleration of vesting and increase in fair value of awards			$ 55.9
Cash settlement of stock options					$ 0	$ 75.2	$ 0
Cash received from option exercises					$ 0	$ 19.9	$ 9.9
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Contractual term (years)				10 years
Expected dividend yield						0.83%	1.04%
Expected volatility						30.86%	26.07%
Risk-free interest rate						0.74%	1.27%
Expected term (years)						6 years	5 years 8 months 12 days
Weighted-average grant date fair value of stock options granted						$ 58.74	$ 37.79
Compensation expense						$ 3.9	$ 4
Income tax benefit recognized in the consolidated statements of income						0.9	1
Fair value of option at Merger Consideration, gross of reduction for options exercise price, cash settled by the Company	$ 301.20
Cash settlement of stock options		$ 75.2
Tax benefit from cash settlement of options		15.6
Aggregate grant-date fair value of stock options vested						8.5	3.7
Intrinsic value of stock options exercised						34.9	13.9
Cash received from option exercises						19.9	9.9
Tax benefit from options exercised during the annual period						$ 7.8	$ 3.5
Share-based Payment Arrangement, Option [Member] | Merger Costs, Net [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional cost recognized on share-based awards for acceleration of vesting and increase in fair value of awards		$ 12.3

Share-Based Compensation, Nonve

Share-Based Compensation, Nonvested Stock (Details) - Nonvested Stock [Member] - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Dec. 14, 2021	Dec. 03, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested, fair value				$ 59.2	$ 15.3
Granted, weighted-average grant date fair value				$ 248.88	$ 147.82
Compensation expense				$ 9.8	$ 10.5
Income tax benefit recognized in the consolidated statements of income				$ 2.4	$ 2.6
Shares vested, vest date price per share		$ 290.71
Income tax benefit from accelerated vesting of shares		$ 2.4
Cash award to be received for each share award replaced	$ 301.20
Merger Costs, Net [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional expense due to accelerated vesting of shares		$ 9.6
Minimum [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
Maximum [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			5 years

Share-Based Compensation, Perfo

Share-Based Compensation, Performance Based Awards (Details) - Performance Based Awards [Member] - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 14, 2021	Dec. 31, 2021	Dec. 13, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period				3 years
OR and ROIC performance period			3 years
Revenue growth multiplier performance period			3 years
Performance based award, earned percentage	200%
Granted, weighted-average grant date fair value					$ 211.10	$ 157.75
Compensation expense					$ 10.1	$ 8.6
Income tax benefit recognized in the consolidated statements of income					2.5	2.1
Shares vested, fair value					$ 11.7	$ 7.8
Cash award to be received for each share award replaced	$ 301.20
Income tax benefit from additional expense due to increase in fair value and number of awards		$ 10.7
Merger Costs, Net [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional expense due to increase in fair value and number of awards		$ 34
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Revenue growth multiplier range			80%
Performance based award, earned percentage			0%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Revenue growth multiplier range			120%
Performance based award, earned percentage			200%

Share-Based Compensation, Emplo

Share-Based Compensation, Employee Stock Purchase Plan (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended				12 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Mar. 21, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, shares issued						41,338	51,658
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized								4,000,000
Maximum employee contribution rate		10%
Employee stock purchase plan, purchase price		85%
Shares available for future grants		0
Expected dividend yield						0.88%	1.07%
Expected volatility						18.65%	30.55%
Risk-free interest rate						0.05%	1.01%
Expected term (years)						6 months	6 months
Weighted-average grant date fair value						$ 40.40	$ 35.14
Compensation expense						$ 0.7	$ 1.7
January 2021 Offering ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, purchase price			$ 170.83
Exercised, shares issued			18,046
Proceeds received from employees	[1]		$ 3.1
July 2020 Offering ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, purchase price				$ 122.91
Exercised, shares issued				23,292
Proceeds received from employees	[1]			$ 2.9
January 2020 Offering ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, purchase price					$ 126.90
Exercised, shares issued					23,709
Proceeds received from employees	[1]				$ 3
[1]Represents amounts received from employees through payroll deductions for share purchases under applicable offering.

Commitments and Contingencies_2

Commitments and Contingencies (Narrative) (Details) $ in Millions, $ in Billions			12 Months Ended
	Jul. 14, 2022 MXN ($)	Jul. 14, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Financial Guarantee [Member]
Loss Contingencies [Line Items]
Letter of credit outstanding, amount			$ 5.8
Percent guarantee of unconsolidated affiliate debt			50%
KCSM [Member]
Loss Contingencies [Line Items]
Total period of time for payments due under railroad Concession to Mexican government			50 years
Percentage of gross revenue payable under railroad Concession to Mexican government			1.25%
Property investment for exclusivity extension under railroad Concession to Mexican government	$ 4	$ 200
Contract extension for exclusivity under railroad Concession to Mexican government	10 years	10 years
KCSM [Member] | Materials and Other Expense [Member]
Loss Contingencies [Line Items]
Concession duty expense			$ 21.2	$ 18.7	$ 17.4
Panama Canal Railway Company [Member] | Financial Guarantee [Member] | 7.0% Senior Secured Notes due November 1, 2026 [Member]
Loss Contingencies [Line Items]
Debt instrument, stated interest rate			7%
Debt instrument, maturity date			Nov. 01, 2026

Commitments and Contingencies P

Commitments and Contingencies Personal Injury Liability Activity (Details) - Personal Injury [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Personal Injury Liability Activity [Roll Forward]
Balance at beginning of year	$ 32.6	$ 31.3
Accruals	18.3	6.3
Changes in estimate	1.4	(1.4)
Payments	(15.6)	(3.6)
Balance at end of year	$ 36.7	$ 32.6

Quarterly Financial Data (Una_3

Quarterly Financial Data (Unaudited) (Details) - USD ($)	3 Months Ended																12 Months Ended
	Dec. 31, 2022		Sep. 30, 2022		Jun. 30, 2022		Mar. 31, 2022		Dec. 31, 2021		Sep. 30, 2021		Jun. 30, 2021		Mar. 31, 2021		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Quarterly Financial Data Disclosure [Line Items]
Revenues	$ 864,500,000		$ 882,200,000		$ 845,500,000		$ 778,200,000		$ 747,800,000		$ 744,000,000		$ 749,500,000		$ 706,000,000		$ 3,370,400,000	$ 2,947,300,000	$ 2,632,600,000
Operating income (loss)	298,200,000	[1]	325,000,000	[1]	312,800,000	[1]	291,100,000	[1]	810,600,000	[2]	251,900,000	[2]	(431,700,000)	[2]	253,000,000	[2]	1,227,100,000	883,800,000	1,003,000,000
Net income (loss)	400,000,000	[3]	201,700,000		194,100,000		188,000,000		595,100,000		156,500,000		(378,000,000)		153,400,000		983,800,000	527,000,000	619,100,000
Net income (loss) attributable to Kansas City Southern and subsidiaries	399,400,000		201,300,000		194,100,000		187,400,000		594,500,000		156,200,000		(378,500,000)		153,000,000		982,200,000	525,200,000	617,000,000
Net merger costs (income)	9,800,000		$ 11,500,000		$ 12,500,000		$ 12,800,000		$ (512,600,000)		$ 36,500,000		$ 720,800,000		$ 19,300,000		46,600,000	264,000,000	0
Gain on settlement of treasury lock agreements	$ 259,300,000																259,300,000	0	0
Cash payments for merger costs																	34,100,000	2,287,200,000	0
Reimbursement of merger termination fees																	$ 0	2,100,000,000	$ 0
Merger Termination Fee [Member] | Merger Costs, Net [Member]
Quarterly Financial Data Disclosure [Line Items]
Cash payments for merger costs																		1,400,000,000
Reimbursement of merger termination fees																		$ 1,400,000,000
[1]During the first, second, third and fourth quarters of 2022, the Company recognized pre-tax net merger costs of $12.8 million, $12.5 million, $11.5 million, and $9.8 million, respectively, related to the Company’s merger with CP.[2]During the first, second, third and fourth quarters of 2021, the Company recognized pre-tax net merger costs (income) of $19.3 million, $720.8 million, $36.5 million, and $(512.6) million, respectively, related to the Company’s various merger activities. The large fluctuations between the quarters are driven by the recognition and reversal of merger termination fees. For the year ended December 31, 2021, KCS incurred $1,400.0 million of merger termination fees, completely offset by the recovery of $1,400.0 million of merger termination fees recognized in merger costs, net within the consolidated statements of income. See more details in Note 3, Merger Agreement.[3]During the fourth quarter of 2022, the Company recognized the gain on settlement of the interest rate derivative instruments of $259.3 million. Refer to Note 10, Derivative Instruments for more information.

Geographic Information (Informa

Geographic Information (Information by Geographic Area) (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) Segments	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable business segments of the Company | Segments									1
Revenues	$ 864.5	$ 882.2	$ 845.5	$ 778.2	$ 747.8	$ 744	$ 749.5	$ 706	$ 3,370.4	$ 2,947.3	$ 2,632.6
Property and equipment (including concession assets), net	9,362.4				9,209.3				9,362.4	9,209.3
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,816.2	1,580.6	1,388.5
Property and equipment (including concession assets), net	5,885.3				5,744.4				5,885.3	5,744.4
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,554.2	1,366.7	$ 1,244.1
Property and equipment (including concession assets), net	$ 3,477.1				$ 3,464.9				$ 3,477.1	$ 3,464.9

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions, $ in Millions		1 Months Ended	12 Months Ended
	Feb. 01, 2023 USD ($)	Jan. 31, 2023 USD ($) $ / $	Dec. 31, 2022 USD ($) $ / $	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 31, 2023 MXN ($) $ / $	Dec. 31, 2022 MXN ($) $ / $
Foreign Currency Hedging [Abstract]
Dividends			$ 880
Cash received (paid) on settlement of foreign currency contracts			(5.1)	$ (1.9)	$ (20)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Sell Ps./Receive USD [Member] | Contracts Executed in 2022 and Settled in 2023
Foreign Currency Hedging [Abstract]
Notional amount of foreign currency contracts			$ 535				$ 11,235.2
Weighted-average exchange rate of foreign currency forward contracts | $ / $			21				21
Subsequent Event [Member]
Foreign Currency Hedging [Abstract]
Dividends	$ 225
Subsequent Event [Member] | Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Contracts Executed in 2022 and Settled in 2023
Foreign Currency Hedging [Abstract]
Cash received (paid) on settlement of foreign currency contracts		$ (46.4)
Subsequent Event [Member] | Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Initial Contracts to Sell Ps./Receive USD [Member] | Contracts Executed in 2023 and Outstanding
Foreign Currency Hedging [Abstract]
Notional amount of foreign currency contracts		$ 250				$ 5,114.6
Weighted-average exchange rate of foreign currency forward contracts | $ / $		20.5				20.5
Subsequent Event [Member] | Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Offsetting Contracts to Purchase Ps./Pay USD [Member] | Contracts Executed in 2022 and Settled in 2023
Foreign Currency Hedging [Abstract]
Notional amount of foreign currency contracts		$ 581.4				$ 11,235.2
Weighted-average exchange rate of foreign currency forward contracts | $ / $		19.3				19.3