Schneider National (SNDR) 10-K 23 Feb 24 2023 FY Annual report Financial data

Cover

Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Feb. 20, 2024	Jun. 30, 2023
Document Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-38054
Entity Registrant Name	Schneider National, Inc.
Entity Incorporation, State or Country Code	WI
Entity Tax Identification Number	39-1258315
Entity Address, Address Line One	3101 South Packerland Drive
Entity Address, City or Town	Green Bay,
Entity Address, State or Province	WI
Entity Address, Postal Zip Code	54313
City Area Code	920
Local Phone Number	592-2000
Title of 12(b) Security	Class B common stock, no par value
Trading Symbol	SNDR
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Error correction of previously filed financial statements	false
Entity Shell Company	false
Entity Public Float			$ 1,570.9
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Central Index Key	0001692063
Current Fiscal Year End Date	--12-31
Class A Common Shares
Document Information
Entity Common Stock, Shares Outstanding		83,029,500
Class B Common Stock
Document Information
Entity Common Stock, Shares Outstanding		92,955,984

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2023
Audit Information [Abstract]
Auditor name	Deloitte & Touche LLP
Auditor location	Milwaukee, Wisconsin
Auditor firm ID	34

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Operating revenues	$ 5,498,900,000	$ 6,604,400,000	$ 5,608,700,000
Operating expenses:
Purchased transportation	2,184,500,000	2,902,900,000	2,657,700,000
Salaries, wages, and benefits	1,359,100,000	1,376,000,000	1,149,500,000
Fuel and fuel taxes	437,400,000	521,000,000	281,400,000
Depreciation and amortization	382,500,000	350,000,000	296,200,000
Operating supplies and expenses—net	576,000,000	534,000,000	462,400,000
Insurance and related expenses	114,300,000	103,000,000	82,400,000
Other general expenses	148,700,000	217,100,000	134,800,000
Goodwill impairment charge	0	0	10,600,000
Total operating expenses	5,202,500,000	6,004,000,000	5,075,000,000
Income from operations	296,400,000	600,400,000	533,700,000
Other expenses (income):
Interest income	(7,000,000)	(2,900,000)	(2,100,000)
Interest expense	14,200,000	9,600,000	12,500,000
Other income—net	(16,900,000)	(10,300,000)	(18,700,000)
Total other income—net	(9,700,000)	(3,600,000)	(8,300,000)
Income before income taxes	306,100,000	604,000,000	542,000,000
Provision for income taxes	67,600,000	146,200,000	136,600,000
Net income	238,500,000	457,800,000	405,400,000
Other comprehensive income (loss):
Foreign currency translation adjustment—net	500,000	(1,500,000)	100,000
Net unrealized gains (losses) on marketable securities—net of tax	1,100,000	(3,500,000)	(900,000)
Total other comprehensive income (loss)—net	1,600,000	(5,000,000)	(800,000)
Comprehensive income	$ 240,100,000	$ 452,800,000	$ 404,600,000
Weighted average common shares outstanding	177.3	177.9	177.6
Basic earnings per share	$ 1.35	$ 2.57	$ 2.28
Weighted average diluted shares outstanding	178.2	178.8	178.1
Diluted earnings per share	$ 1.34	$ 2.56	$ 2.28
Dividends declared per share	$ 0.36	$ 0.32	$ 0.28

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 102.4	$ 385.7
Marketable securities	57.2	45.9
Trade accounts receivable—net of allowance of $15.0 million and $13.7 million, respectively	575.7	643.7
Other receivables	61.9	21.3
Current portion of lease receivables—net of allowance of $1.0 million and $1.3 million, respectively	93.3	111.2
Inventories—net	117.9	53
Prepaid expenses and other current assets	102.5	89.5
Total current assets	1,110.9	1,350.3
Property and equipment:
Transportation equipment	3,781	3,410.7
Land, buildings, and improvements	226.1	219
Other property and equipment	180.2	174.1
Total property and equipment	4,187.3	3,803.8
Less accumulated depreciation	1,605.6	1,523.8
Net property and equipment	2,581.7	2,280
Lease receivables	130.2	163.1
Internal use software and other noncurrent assets	402.7	296.6
Goodwill	331.7	228.2
Total noncurrent assets	3,446.3	2,967.9
Total Assets	4,557.2	4,318.2
Current Liabilities:
Trade accounts payable	241.3	276.7
Accrued salaries, wages, and benefits	66.7	97.8
Claims accruals—current	89.2	75.5
Current maturities of debt and finance lease obligations	104.5	73.3
Other current liabilities	104.5	113.6
Total current liabilities	606.2	636.9
Noncurrent Liabilities:
Long-term debt and finance lease obligations	197.6	141.8
Claims accruals—noncurrent	92.7	95.2
Deferred income taxes	595.7	538.2
Other noncurrent liabilities	108.2	68.9
Total noncurrent liabilities	994.2	844.1
Total Liabilities	1,600.4	1,481
Shareholders' Equity:
Additional paid-in capital	1,595.2	1,584.4
Retained earnings	1,431.9	1,257.8
Accumulated other comprehensive loss	(3.4)	(5)
Treasury stock at cost	(66.9)	0
Total Shareholders’ Equity	2,956.8	2,837.2
Total Liabilities and Shareholders’ Equity	4,557.2	4,318.2
Supplemental Income Statement Elements [Abstract]
Trade accounts receivable allowance	15	13.7
Lease receivables allowance	$ 1	$ 1.3
Operating lease right-of-use assets	Internal use software and other noncurrent assets	Internal use software and other noncurrent assets
Finance lease right-of-use assets	Net property and equipment	Net property and equipment
Operating lease liability current	Other current liabilities	Other current liabilities
Operating lease liability noncurrent	Other noncurrent liabilities	Other noncurrent liabilities
Operating lease liability	Total Liabilities	Total Liabilities
Finance lease liability current	Current maturities of debt and finance lease obligations	Current maturities of debt and finance lease obligations
Finance lease liability noncurrent	Long-term debt and finance lease obligations	Long-term debt and finance lease obligations
Finance lease liability	Total Liabilities	Total Liabilities
Preferred Stock
Shareholders' Equity:
Preferred stock	$ 0	$ 0
Preferred stock, par value (usd per share)	$ 0	$ 0
Preferred stock, shares authorized (shares)	50,000,000	50,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Class A Common Shares
Shareholders' Equity:
Common stock	$ 0	$ 0
Common stock, par value (usd per share)	$ 0	$ 0
Common stock, shares authorized (shares)	250,000,000	250,000,000
Common stock, shares issued (shares)	83,029,500	83,029,500
Common shares outstanding	83,029,500	83,029,500
Class B Common Stock
Shareholders' Equity:
Common stock	$ 0	$ 0
Common stock, par value (usd per share)	$ 0	$ 0
Common stock, shares authorized (shares)	750,000,000	750,000,000
Common stock, shares issued (shares)	95,796,669	95,655,907
Common shares outstanding	92,931,242	94,993,144
Treasury Stock, Common
Shareholders' Equity:
Treasury stock, common shares	2,505,267	0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities:
Net income	$ 238,500,000	$ 457,800,000	$ 405,400,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	382,500,000	350,000,000	296,200,000
Goodwill impairment	0	0	10,600,000
Gains on sales of property and equipment—net	(28,700,000)	(85,700,000)	(63,900,000)
Proceeds from lease receipts	74,900,000	83,500,000	75,800,000
Loss on sale of business	0	5,000,000	0
Deferred income taxes	55,800,000	83,000,000	2,000,000
Long-term incentive and share-based compensation expense	15,800,000	16,500,000	14,400,000
Gains on investments in equity securities—net	(19,700,000)	(13,700,000)	(21,600,000)
Other noncash items—net	500,000	(15,200,000)	(4,400,000)
Changes in operating assets and liabilities:
Receivables	42,400,000	51,600,000	(162,000,000)
Other assets	(21,200,000)	(43,400,000)	(46,000,000)
Payables	(32,600,000)	(42,200,000)	70,200,000
Claims reserves and receivables—net	9,400,000	8,500,000	6,800,000
Other liabilities	(37,600,000)	700,000	(17,400,000)
Net cash provided by operating activities	680,000,000	856,400,000	566,100,000
Investing Activities:
Purchases of transportation equipment	(660,100,000)	(535,100,000)	(399,400,000)
Purchases of other property and equipment	(42,300,000)	(52,900,000)	(49,500,000)
Proceeds from sale of property and equipment	128,600,000	126,300,000	177,800,000
Proceeds from sale of off-lease inventory	34,600,000	25,800,000	17,000,000
Purchases of lease equipment	(105,200,000)	(105,600,000)	(91,700,000)
Proceeds from government grants	14,600,000	0	0
Proceeds from marketable securities	6,200,000	6,200,000	14,600,000
Purchases of marketable securities	(16,200,000)	(7,600,000)	(18,700,000)
Investments in equity securities and equity method investment	(17,600,000)	(24,200,000)	(5,200,000)
Investment in notes receivable	(10,000,000)	0	0
Acquisitions and sale of business, net of cash acquired	(240,200,000)	(31,700,000)	(271,300,000)
Net cash used in investing activities	(907,600,000)	(598,800,000)	(626,400,000)
Financing Activities:
Proceeds under revolving credit agreements	186,000,000	0	0
Payments under revolving credit agreements	(81,000,000)	0	0
Proceeds from long-term debt	50,000,000	0	0
Payments of debt and finance lease obligations	(73,900,000)	(62,000,000)	(40,800,000)
Dividends paid	(63,600,000)	(55,700,000)	(49,600,000)
Repurchases of common stock	(66,900,000)	0	0
Other financing activities	(6,300,000)	1,000,000	0
Net cash used in financing activities	(55,700,000)	(116,700,000)	(90,400,000)
Net increase (decrease) in cash and cash equivalents	(283,300,000)	140,900,000	(150,700,000)
Cash and Cash Equivalents:
Beginning of period	385,700,000	244,800,000	395,500,000
End of period	102,400,000	385,700,000	244,800,000
Noncash investing and financing activity:
Transportation and lease equipment purchases in accounts payable	8,700,000	13,000,000	14,600,000
Dividends declared but not yet paid	16,900,000	16,200,000	14,100,000
Noncash equity investment	3,300,000	0	0
Sale of assets in exchange for notes receivable	0	2,300,000	0
Cash paid during the period for:
Interest	10,200,000	9,300,000	11,600,000
Income taxes—net of refunds	$ 67,600,000	$ 52,800,000	$ 145,900,000

Consolidated Statements Shareho

Consolidated Statements Shareholders' Equity - USD ($) $ in Millions	Total	Class A Common Shares	Class B Common Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock, Common
Balance at Dec. 31, 2020	$ 2,055.5			$ 0	$ 1,552.2	$ 502.5	$ 0.8	$ 0
Increase (Decrease) in Stockholders' Equity
Net income	405.4			0	0	405.4	0	0
Other comprehensive income (loss)	(0.8)			0	0	0	(0.8)	0
Share-based compensation expense (benefit)	$ 14.6			0	14.6	0	0	0
Dividends declared per share	$ 0.28	$ 0.28	$ 0.28
Dividends declared	$ (50.1)			0	0	(50.1)	0	0
Share issuances	0.9			0	0.9	0	0	0
Exercise of employee stock options	0.7			0	0.7	0	0	0
Shares withheld for employee taxes	(2.4)			0	(2.4)	0	0	0
Balance at Dec. 31, 2021	2,423.8			0	1,566	857.8	0	0
Increase (Decrease) in Stockholders' Equity
Net income	457.8			0	0	457.8	0	0
Other comprehensive income (loss)	(5)			0	0	0	(5)	0
Share-based compensation expense (benefit)	$ 17.2			0	17.2	0	0	0
Dividends declared per share	$ 0.32	0.32	0.32
Dividends declared	$ (57.8)			0	0	(57.8)	0	0
Share issuances	0.2			0	0.2	0	0	0
Exercise of employee stock options	3.4			0	3.4	0	0	0
Shares withheld for employee taxes	(2.4)			0	(2.4)	0	0	0
Balance at Dec. 31, 2022	2,837.2			0	1,584.4	1,257.8	(5)	0
Increase (Decrease) in Stockholders' Equity
Net income	238.5			0	0	238.5	0	0
Other comprehensive income (loss)	1.6			0	0	0	1.6	0
Share-based compensation expense (benefit)	$ 17			0	17	0	0	0
Dividends declared per share	$ 0.36	$ 0.36	$ 0.36
Dividends declared	$ (64.4)			0	0	(64.4)	0	0
Repurchases of common stock	(66.9)			0	0	0	0	(66.9)
Share issuances	0.1			0	0.1	0	0	0
Exercise of employee stock options	0.1			0	0.1	0	0	0
Shares withheld for employee taxes	(6.4)			0	(6.4)	0	0	0
Balance at Dec. 31, 2023	$ 2,956.8			$ 0	$ 1,595.2	$ 1,431.9	$ (3.4)	$ (66.9)

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations We are one of the largest providers of surface transportation and logistics solutions in North America that, through our wholly owned subsidiaries, provides safe, reliable, and innovative truckload, intermodal, and logistics services to a diverse group of customers throughout the continental U.S., Canada, and Mexico. Principles of Consolidation and Basis of Presentation Our consolidated financial statements have been prepared in conformity with GAAP and include all of our wholly owned subsidiaries. All intercompany transactions have been eliminated in consolidation. Use of Estimates We make estimates and assumptions that affect assets, liabilities, the disclosure of contingent liabilities at the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from these estimates. Cash and Cash Equivalents Cash in excess of current operating requirements is invested in short-term, highly liquid investments. We consider all highly liquid investments purchased with original maturities of three months or less to be cash equivalents. Receivables and Allowance Our trade accounts receivable is recorded net of an allowance for doubtful accounts and revenue adjustments. The allowance is based on an aging analysis using historical experience, as well as any current and forecasted trends or uncertainties related to customer billing and account collectability. The adequacy of our allowance is reviewed at least quarterly, and reserves for receivables not expected to be collected are established. In circumstances where we are aware of a customer’s inability to meet its financial obligations, a specific reserve is recorded to reduce the net receivable to the amount we reasonably expect to collect. Bad debt expense is included in other general expenses in the consolidated statements of comprehensive income. We record our lease receivables net of an allowance for doubtful accounts based on an aging analysis to reserve amounts expected to be uncollectible. The terms of the lease agreements generally give us the ability to take possession of the underlying asset in the event of default. We may incur credit losses in excess of recorded allowances if the full amount of anticipated proceeds from the sale or re-lease of the asset supporting the third party’s financial obligation, which can be impacted by economic conditions, is not realized. Inventory Our inventories consist of tractors and trailing equipment owned by our equipment leasing company to be sold or leased to owner-operators, as well as parts, tires, supplies, and fuel for use in our Company operations. These inventories are valued at the lower of cost or net realizable value using specific identification or average cost. The following table shows the components of our inventory balances as of the dates shown. (in millions) December 31, 2023 December 31, 2022 Tractors and trailing equipment for sale or lease $ 99.0 $ 35.8 Replacement parts 17.5 15.7 Tires and other 1.4 1.5 Total $ 117.9 $ 53.0 Investments in Marketable Securities Our marketable securities are classified as available-for-sale and carried at fair value in current assets on the consolidated balance sheets. While our intent is to hold our securities to maturity, sudden changes in the market or to our liquidity needs may cause us to sell certain securities in advance of their maturity date. Our marketable securities are accounted for under ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments . Under this guidance, credit losses are recorded through an allowance for credit losses rather than as a direct write-down to the security, and unrealized gains and losses, net of tax, are included as a component of accumulated other comprehensive income on the consolidated balance sheets, unless we determine that the amortized cost basis is not recoverable. If we determine that the amortized cost basis of the impaired security is not recoverable, we recognize the credit loss by increasing the allowance for those losses. We did not have an allowance for credit losses on our marketable securities as of December 31, 2023 and 2022. Cost basis is determined using the specific identification method. We elected to continue to present the accrued interest receivable balance associated with our investments in marketable securities separate from the marketable securities line in the consolidated balance sheets. In addition, we elected the practical expedient provided under the guidance to exclude the applicable accrued interest from the amortized cost basis disclosure of our marketable securities. We have also elected not to measure an allowance for credit losses on our accrued interest receivable and to write off accrued interest receivable by reversing interest income when it is not considered collectible. Fair Value Fair value is the estimated price that would be received to sell an asset or paid to transfer a liability. Inputs to valuation techniques used to measure fair value fall into three broad levels (Levels 1, 2, and 3) as follows: Level 1 —Observable inputs that reflect quoted prices for identical assets or liabilities in active markets that we have the ability to access at the measurement date. Level 2 —Observable inputs, other than quoted prices included in Level 1, for the asset or liability or prices for similar assets and liabilities. Level 3 —Unobservable inputs reflecting the reporting entity’s estimates of the assumptions that market participants would use in pricing the asset or liability (including assumptions about risk). Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Property and Equipment Property and equipment are recorded at cost. Depreciation is calculated using the straight-line method based on the estimated useful lives and residual values. Generally, the estimated useful lives are as follows: 2023 Tractors 3 - 8 years Trailing equipment 6 - 20 years Other transportation equipment 4 - 5 years Buildings and improvements 5 - 25 years Other property 3 - 10 years Salvage values, when applicable, generally range from 0% - 30% or 0% - 25% of the original cost for tractors and trailing equipment, respectively, and reflect agreements with tractor suppliers for residual or trade-in values for certain new equipment. Long-lived assets require an impairment review when events or circumstances indicate that the carrying amount may not be recoverable. We base our evaluation of other long-lived assets on the presence of impairment indicators such as the future economic benefit of the assets, any historical or future profitability measurements, and other external market conditions or factors. The carrying amount of tangible long-lived assets held and used is considered not recoverable if the carrying amount exceeds the undiscounted sum of cash flows expected to result from the use and eventual disposition of the asset. If the carrying amount is not recoverable, the impairment loss is measured as the excess of the asset’s carrying amount over its fair value. Gains and losses on the sale or other disposition of equipment are based on the difference between the proceeds received less costs to sell and the net book value of the assets disposed. Gains and losses are recognized at the time of sale or disposition and are classified in operating supplies and expenses—net in the consolidated statements of comprehensive income. For the years ended December 31, 2023, 2022, and 2021, we recognized $28.7 million of net gains, $85.7 million of net gains, and $63.9 million of net gains on the sale of property and equipment, respectively. Net gains for 2022 were primarily related to the sale of the Company’s Canadian facility. Assets Held for Sale Assets held for sale consist of transportation equipment and are included in prepaid expenses and other current assets in the consolidated balance sheets. Reclassification to assets held for sale occurs when the required criteria, as defined by ASC 360, Property, Plant and Equipment , are satisfied. Assets held for sale are evaluated for impairment when transferred to held for sale status or when impairment indicators are present. The carrying amount of assets held for sale is not recoverable if the carrying amount exceeds the fair value less estimated costs to sell the asset. An impairment loss is recorded for the excess of the asset’s carrying amount over its fair value less estimated costs to sell. Impairment losses are recorded in operating supplies and expenses—net in the consolidated statements of comprehensive income. We recorded no significant impairment losses for the years ended December 31, 2023, 2022, or 2021. Assets held for sale by segment as of December 31, 2023 and 2022 were as follows: (in millions) 2023 2022 Truckload $ 22.1 $ 21.0 Intermodal 6.7 0.8 Total $ 28.8 $ 21.8 Internal Use Software and Cloud Computing Arrangements We capitalize certain costs incurred to acquire, develop, or modify software to meet the Company’s internal needs. Only costs incurred during the application development stage are capitalized once the preliminary project stage is complete and management has committed to funding the project. Internal use software costs are amortized on a straight-line basis primarily over five Under ASU 2018-15, we capitalize certain implementation costs for internal use software incurred in a CCA that is a service contract. CCA implementation costs are amortized on a straight-line basis over the term of the related hosting agreement, taking into consideration renewal options, if any. The renewal period is included in the amortization period if determined that the option is reasonably certain to be exercised. Amortization expense is recorded within operating supplies and expenses—net on the consolidated statements of comprehensive income, similar to the related hosting fees. We recorded $4.7 million, $1.3 million, and $1.0 million of amortization expense related to CCA implementation costs during the years ended December 31, 2023, 2022, and 2021, respectively. Capitalized computer costs are evaluated for impairment on an ongoing basis. If events or changes in circumstances (such as the manner in which the hosting arrangement is expected to be used) indicate that the carrying value may not be recoverable, the Company will evaluate the asset for impairment. If impairment is identified, it is recorded in operating supplies and expenses—net in the consolidated statements of comprehensive income. The following table provides information related to our internal use software and CCA implementation costs as of the dates shown. (in millions) December 31, 2023 December 31, 2022 Internal use software $ 325.6 $ 341.3 Less accumulated amortization 242.3 249.5 Net internal use software $ 83.3 $ 91.8 CCA implementation costs $ 35.9 $ 27.2 Less accumulated amortization 7.0 2.3 Net CCA implementation costs (1) $ 28.9 $ 24.9 (1) On the consolidated balance sheets, the current portion of CCA implementation costs are included within prepaid expenses and other current assets and amounted to $6.7 million and $1.3 million for the years ended December 31, 2023 and 2022, respectively, and the noncurrent portion is included in internal use software and other noncurrent assets and amounted to $22.2 million and $23.5 million for the years ended December 31, 2023 and 2022, respectively. Goodwill Goodwill is tested for impairment annually in October, or more frequently if impairment indicators exist. The carrying amount of a reporting unit’s goodwill is considered not recoverable, and an impairment loss is recorded if the carrying amount of the reporting unit exceeds the reporting unit’s fair value, as determined based on the combination of income and market approaches. See Note 6, Goodwill and Other Intangible Assets , for more information on our goodwill. Revenue Recognition We recognize revenue during the delivery period based on relative transit time in each reporting period, in accordance with ASC 606, with expenses recognized as incurred. Accordingly, a portion of the total revenue that will be billed to the customer once a load is delivered is recognized in each reporting period based on the percentage of the freight delivery service that has been completed at the end of the reporting period. When we use third-party carriers, we generally record revenues on the gross basis at amounts charged to our customers because we are the primary obligor, we are a principal in the transaction, we invoice our customers and retain all credit risks, and we maintain discretion over pricing. Additionally, we are responsible for selection of third-party transportation providers to the extent they are used to satisfy customer freight requirements. We record revenues net of pass-through taxes in our consolidated statements of comprehensive income. For the years ended December 31, 2023, 2022, and 2021, no customer accounted for more than 10% of our consolidated revenues. Income Taxes Income taxes are accounted for under the liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as income or expense in the period that includes the enactment date. We record valuation allowances for deferred tax assets to the extent we do not believe these assets are more likely than not to be realized through the reversal of existing taxable temporary differences, projected future taxable income, or tax-planning strategies. We record a liability for unrecognized tax benefits when the benefits of tax positions taken on a tax return are not more likely than not to be sustained upon audit. Interest and penalties related to uncertain tax positions are classified as income tax expense in the consolidated statements of comprehensive income. Earnings Per Share We compute basic earnings per share by dividing net income available to common stockholders by the weighted average number of common shares outstanding for the reporting period. Diluted earnings per share reflects the potential dilution that could occur if holders of unvested restricted and performance share units or options were to exercise or convert their holdings into common stock. Awards that would have an anti-dilutive impact are excluded from the calculation. Treasury Stock In 2023, the Company approved a stock repurchase program (the “Share Repurchase Program”) in which it periodically purchases its own common stock to offset the dilutive effects of equity grants to employees over time. The Inflation Reduction Act of 2022 subjects repurchases to a 1% nondeductible excise tax, which is included in the cost. The repurchased stock is classified as treasury stock on the consolidated balance sheets and is held at cost. Share-based Compensation We have share-based compensation plans covering certain employees, including officers and directors. We account for share-based compensation using the fair value recognition provisions of current accounting standards for share-based payments. These awards have historically consisted of restricted shares, RSUs, performance-based restricted shares, PSUs, and non-qualified stock options. We recognize compensation expense over the requisite service periods within each award. See Note 12, Share-Based Compensation , for more information about our plans. Claims Accruals We are self-insured for loss of and damage to our owned and leased transportation equipment. We purchase insurance coverage for a portion of expenses related to employee injuries, vehicular accidents, and cargo damage. Certain insurance arrangements include a level of self-insurance (deductible) coverage applicable to each claim. We have excess policies to limit our exposure to catastrophic claim costs. The amounts of self-insurance change from time to time based on measurement dates, policy expiration dates, and claim type. Our claims accrual policy for all self-insured claims is to recognize a liability at the time of the incident based on our analysis of the nature and severity of the claims and analyses provided by third-party claims administrators, as well as legal, economic, and regulatory factors. The ultimate cost of a claim develops over time as additional information regarding the nature, timing, and extent of damages claimed becomes available. Accordingly, we use an actuarial method to develop current claim information to derive an estimate of our ultimate claim liability. This process involves the use of loss-development factors based on our historical claims experience and includes a contractual premium adjustment factor, if applicable. In doing so, the recorded liability considers future claims growth and provides an allowance for incurred but not reported claims. We do not discount our estimated losses. At December 31, 2023 and 2022, we had an accrual of $178.4 million and $164.9 million, respectively, for estimated claims net of reinsurance receivables. In addition, we are required to pay certain advanced deposits and monthly premiums. At December 31, 2023 and 2022, we had an aggregate prepaid insurance asset of $9.6 million and $9.2 million, respectively, which represented prefunded premiums and deposits. Government Grants We have received grants from various California state organizations to be used towards the electrification of our fleet, inclusive of BEVs and charging stations. As there is no specific guidance under GAAP, we have elected to account for such grants under IAS 20, Accounting for Government Grants and Disclosure of Government Assistance , using the gross presentation model for the balance sheet and the net presentation model for the income statement. In accordance with IAS 20’s net presentation model, government grants can be offset against the related expenditures on the income statement when there is reasonable assurance that (1) the recipient will comply with the relevant conditions and (2) the grant will be received. During 2023, the Company placed assets in service that were purchased using grants from the EPA’s Targeted Airshed Grant (administered by the CARB) and the South Coast Air Quality Management District’s Joint Electric Truck Scaling Initiative. As of December 31, 2023, the Company believes the above conditions have been met, and for the year ended December 31, 2023, depreciation and amortization expense was reduced by $1.3 million in the consolidated statements of comprehensive income. As of December 31, 2023, the Company’s consolidated balance sheets included $2.1 million of grant receivables within other receivables and $2.4 million and $13.5 million in deferred grant income within other current liabilities and other noncurrent liabilities, respectively. Sale of Business On November 30, 2022, the Company entered into a management buyout agreement to sell 100% of its China-based logistics operations to certain members of Asia’s management team, ceasing Schneider’s Asia operations. The sale resulted in the recognition of a $5.0 million loss, which was recorded within operating supplies and expenses—net in the consolidated statements of comprehensive income, and operating results through the date of sale are included within Other. In conjunction with the management buyout agreement, a $4.1 million payment was made and is included within acquisitions and sale of business, net of cash acquired on the consolidated statements of cash flows. Accounting Standards Issued but Not Yet Adopted In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280) . This standard requires entities to disclose significant segment expenses that are regularly provided to the CODM, an amount and description of other segment items by reportable segment, all annual disclosures currently required under ASC 280 on an interim basis, if the CODM uses more than one measure of a segment’s profit or loss, at least one of the reported measures should be the measure most consistent with the measurement principle used in the consolidated financial statements, disclosure of title and position of CODM, as well as an explanation of how the CODM uses the reported measures in accessing performance and allocating resources, and a requirement for an entity with a single reportable segment to provide all of the disclosures required by this standard. This standard is effective for fiscal years beginning after December 15, 2023 with the interim requirement beginning within fiscal years beginning after December 15, 2024. We are currently evaluating the potential impacts of this update. In December 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosures . This standard requires additional income tax disclosures to enhance the transparency and decision usefulness of income tax disclosures. ASU 2023-09 requires entities to disclose information on revised quantitative thresholds and to disaggregate taxes by federal, state, and local jurisdictions. This is effective for annual periods beginning after December 15, 2024, with early adoption permitted. We are currently evaluating the potential impacts of this update.

Business Combinations and Asset

Business Combinations and Asset Acquisitions	12 Months Ended
	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Acquisitions	ACQUISITIONS M&M Transport Services, LLC On August 1, 2023 (“Acquisition Date”), we acquired 100% of the membership interest in M&M for $243.8 million, inclusive of cash and other working capital adjustments. M&M is a dedicated trucking company located primarily in New England with nearly 500 tractors and 1,900 trailers which we believe complements our dedicated operations. The acquisition of M&M was accounted for under the acquisition method of accounting, which requires that assets acquired and liabilities assumed be recognized on the consolidated balance sheets at their fair value as of the Acquisition Date. Fair value estimates of acquired transportation equipment were based on an independent appraisal, giving consideration to the highest and best use of the assets with key assumptions based on the market approach. These inputs represent Level 3 measurements in the fair value hierarchy and required significant judgments and estimates at the time of valuation. The assistance of an independent third-party valuation firm was used to determine the estimated fair values and useful lives of finite-lived intangible assets including customer relationships and trademarks. Valuation methods used were the multi-period excess earnings method and relief from royalty method for customer relationships and trademarks, respectively. Non-compete agreements were recorded based on the amount paid at closing. The excess of the purchase price over the estimated fair values of assets acquired and liabilities assumed was recorded as goodwill within the Truckload segment. The goodwill is attributable to expected synergies and growth opportunities within our dedicated business and is expected to be deductible for tax purposes. Acquisition-related costs, which consist of fees incurred for advisory, legal, and accounting services were $0.9 million and were included in other general expenses in the Company’s consolidated statements of comprehensive income for the period ended December 31, 2023. Certain amounts recorded in connection with the acquisition are still considered preliminary as we continue to gather the necessary information to finalize our fair value estimates and provisional amounts. Provisional amounts include items related to indemnification assets and liabilities and deferred taxes. During the measurement period, which is up to one year from the acquisition date, we may adjust provisional amounts that were recognized at the acquisition date to reflect new information obtained about facts and circumstances that existed as of the acquisition date. We anticipate finalizing the determination of fair value no later than July 31, 2024. The preliminary purchase price allocation for M&M, which may be adjusted as we finalize our fair value estimates and provisional amounts, was as follows: Recognized amounts of identifiable assets acquired and liabilities assumed (in millions) August 1, 2023 Adjustments Adjusted Cash and cash equivalents $ 3.6 $ — $ 3.6 Trade accounts receivable—net of allowance 15.1 — 15.1 Prepaid expenses and other current assets 3.0 — 3.0 Net property and equipment 77.8 — 77.8 Internal use software and other noncurrent assets 56.9 0.5 57.4 Goodwill 104.6 (1.1) 103.5 Total assets acquired 261.0 (0.6) 260.4 Trade accounts payable 1.4 — 1.4 Accrued salaries, wages, and benefits 5.3 — 5.3 Claims accruals—current 1.8 — 1.8 Other current liabilities 4.2 (1.3) 2.9 Other noncurrent liabilities 5.2 — 5.2 Total liabilities assumed 17.9 (1.3) 16.6 Net assets acquired $ 243.1 $ 0.7 $ 243.8 The above adjustments made during the measurement period were primarily related to working capital, accrued taxes, and intangible assets. The following unaudited pro forma revenues give effect to the acquisition had it been effective January 1, 2021. Combined unaudited pro forma operating revenues of the Company and M&M would have been approximately $5,569.6 million during the year ended December 31, 2023, $6,729.6 million during the year ended December 31, 2022, and $5,720.5 million during the year ended December 31, 2021, and our earnings for the same periods would not have been materially different. deBoer Transportation, Inc. We entered into a Securities Purchase Agreement, dated June 7, 2022, to acquire 100% of the outstanding equity of deBoer, a regional, dedicated carrier headquartered in Blenker, WI. The acquisition provided Schneider the opportunity to expand our tractor and trailer fleet primarily within our dedicated Truckload operations, as well as our company driver capacity. During the second half of 2022, the Company successfully transitioned equipment and employees from deBoer to Schneider, deBoer operations ceased, and equipment and drivers were deployed primarily within our Truckload segment. The aggregate purchase price of the acquisition was approximately $34.6 million inclusive of certain cash and net working capital adjustments, and the assets acquired consisted primarily of rolling stock. The acquisition was accounted for under the acquisition method of accounting, which requires that assets acquired and liabilities assumed be recognized on the consolidated balance sheets at their fair values as of the acquisition date. The fair values of net assets acquired were determined using Level 3 inputs, and the excess of the purchase price over the estimated fair value of the net assets resulted in $7.7 million of goodwill being recorded within the Truckload segment at the time of acquisition. Following the acquisition, purchase price adjustments of $1.6 million were made relating to deferred taxes and certain working capital amounts resulting in an adjusted goodwill balance of $6.1 million as of December 31, 2022. Acquisition-related costs, which consisted of fees incurred for advisory, legal, and accounting services, were $0.3 million and were included in other general expenses in the Company’s consolidated statements of comprehensive income for the period ended December 31, 2022. Operating results for deBoer are included in our consolidated results of operations from the acquisition date. Pro forma information for this acquisition is not provided as it did not have a material impact on the Company’s consolidated operating results. Midwest Logistics Systems, Ltd. We entered into a Securities Purchase Agreement, dated December 31, 2021, to acquire 100% of the outstanding equity of MLS, a dedicated trucking company based in Celina, OH, and certain affiliated entities holding assets comprising substantially all of MLS’s business. MLS is a premier dedicated carrier in the central U.S. that we believe complements our growing dedicated operations. The aggregate purchase price of the acquisition was approximately $268.8 million inclusive of $5.7 million in net working capital and other post-acquisition adjustments received in 2022 and a deferred payment of $3.2 million made in January 2022. Proceeds from the total purchase consideration were used to settle $26.9 million of MLS’s outstanding debt as of the acquisition date. The acquisition of MLS was accounted for under the acquisition method of accounting, which requires that assets acquired and liabilities assumed be recognized on the consolidated balance sheets at their fair values as of the acquisition date. These inputs represent Level 3 measurements in the fair value hierarchy and required significant judgments and estimates at the time of valuation. Fair value estimates of acquired property and equipment were based on an independent appraisal, giving consideration to the highest and best use of the assets. Key assumptions used in the transportation equipment appraisals were based on the market approach, while key assumptions used in the land, buildings and improvements, and other property and equipment appraisals were based on a combination of the income (direct capitalization) and sales comparison approaches, as appropriate. The excess of the purchase price over the estimated fair values of assets acquired and liabilities assumed was recorded as goodwill within the Truckload segment. The goodwill is attributable to expected synergies and growth opportunities within our dedicated business and is expected to be deductible for tax purposes. Acquisition-related costs, which consisted of fees incurred for advisory, legal, and accounting services, were $1.9 million and were included in other general expenses in the Company’s consolidated statements of comprehensive income for the period ended December 31, 2021. The following table summarizes the purchase price allocation for MLS, including any adjustments during the measurement period. Recognized amounts of identifiable assets acquired and liabilities assumed (in millions) December 31, 2021 Adjustments Adjusted December 31, 2021 Opening Balance Sheet Cash and cash equivalents $ — $ 1.8 $ 1.8 Trade accounts receivable—net of allowance 18.6 (6.7) 11.9 Other receivables 0.9 1.5 2.4 Prepaid expenses and other current assets 1.6 — 1.6 Net property and equipment 148.9 (0.8) 148.1 Internal use software and other noncurrent assets — 11.7 11.7 Goodwill 122.7 (18.4) 104.3 Total assets acquired 292.7 (10.9) 281.8 Trade accounts payable 1.8 1.6 3.4 Accrued salaries, wages, and benefits 1.7 0.9 2.6 Claims accruals—current 7.5 (3.0) 4.5 Other current liabilities 7.2 (3.9) 3.3 Deferred income taxes — (1.1) (1.1) Other noncurrent liabilities — 0.3 0.3 Total liabilities assumed 18.2 (5.2) 13.0 Net assets acquired $ 274.5 $ (5.7) $ 268.8 The above adjustments made during the measurement period ended December 31, 2022 were primarily related to working capital, property and equipment, leases, claims accruals, deferred taxes, and intangible assets. The fair values of identifiable intangible assets, including customer relationships and trademarks, were based on valuations using income-based approaches and Level 3 inputs. No material statement of comprehensive income effects were identified with these adjustments. Combined unaudited pro forma operating revenues of the Company and MLS would have been approximately $5,816.0 million for the year ended December 31, 2021 and our earnings for the same period would not have been materially different.

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue Recognition	REVENUE RECOGNITION Disaggregated Revenues The majority of our revenues are related to transportation and have similar characteristics. M&M, MLS, and deBoer revenues since the acquisition dates are included within Transportation revenues, consistent with the remainder of our Truckload segment. The following table summarizes our revenues by type of service, which are explained in greater detail below. Year Ended December 31, Disaggregated Revenues ( in millions ) 2023 2022 2021 Transportation $ 5,102.0 $ 6,119.9 $ 5,166.7 Logistics Management 190.1 274.2 219.0 Other 206.8 210.3 223.0 Total operating revenues $ 5,498.9 $ 6,604.4 $ 5,608.7 Transportation Transportation revenues are generated from our Truckload and Intermodal segments, as well as from our brokerage business, which is included in the Logistics segment. In the Transportation portfolio, our service obligation to customers is satisfied over time. We do not believe there is a significant impact on the nature, amount, timing, and uncertainty of revenue or cash flows based on the mode of transportation. The economic factors that impact our transportation revenue are generally consistent across these modes given the relatively short-term nature of each contract. For the majority of our transportation business, the “contract with a customer” is identified as an individual order under a negotiated agreement. Some consideration is variable in that a final transaction price is uncertain and is susceptible to factors outside of the Company’s influence, such as the weather or the accumulation of accessorial charges. Pricing information is supplied by rate schedules that accompany negotiated contracts. Occasionally we provide freight movements to customers in exchange for non-monetary services. The fair value of non-monetary consideration on these freight movements is included in operating revenues on the consolidated statements of comprehensive income and consists primarily of transportation equipment. There was no revenue recorded in 2023 for freight movements in exchange for non-monetary consideration. The amount of operating revenues recorded for these services was $16.0 million and $6.3 million in 2022 and 2021, respectively. Transportation orders are short-term in nature generally having terms of significantly less than one year. They do not include significant financing components. A small portion of revenues in our transportation business relate to fixed payments in our Truckload segment. These payments are due regardless of volumes, and in these arrangements, the master agreement rather than the individual order may be considered the “contract”. Refer to the Remaining Performance Obligations table below for more information on these fixed payments. Under ASC 606, we recognize revenue over the period transportation services are provided to the customer, including service performed as of the end of the reporting period for loads currently in transit, in order to recognize the value transferred to a customer over the course of the transportation service. We determine revenue in transit using the input method, under which revenue is recognized based on time lapsed from the departure date to the arrival date. Measurement of revenue in transit requires the application of significant judgment. We calculate the estimated percentage of an order’s transit time that is complete at period end, and we apply that percentage of completion to the order’s estimated revenue. In certain transportation arrangements, an unrelated party contributes a specified service to our customer. For example, we contract with third-party carriers to perform transportation services on behalf of our customers in our brokerage business, and we use third-party rail carriers in our Intermodal segment. In situations that include the contributions of third parties, we act as principal in the arrangement, and accordingly, we recognize gross revenues from these transactions. Logistics Management Logistics Management revenues relate to our SCDM operating segment, which is included in our Logistics segment. Within this portfolio, the key service we provide to customers is management of freight shipping and/or storage. The “contracts” in our Logistics Management portfolio are negotiated agreements, which contain both fixed and variable components. The variability of revenues is driven by volumes and transactions, which are known as of an invoice date. Refer to the Remaining Performance Obligations table below for additional information. SCDM contracts typically have terms that extend beyond one year and do not include financing components. Under ASC 606, we have elected to use the right to invoice practical expedient, which reflects the fact that a customer obtains the benefit associated with logistics services as they are provided (output method), and therefore, we recognize revenue under these contracts over time. In our supply chain management business, we subcontract third parties to perform a portion of the services. We are responsible for ensuring the services are performed and are acceptable to the customer; therefore, we are considered the principal in these arrangements. Other Other revenues relate to activities that are out of scope for purposes of ASC 606, including our leasing and captive insurance businesses. Quantitative Disclosure The following table provides information related to transactions and expected timing of revenue recognition for performance obligations that are fixed in nature and relate to contracts with terms greater than one year as of the date shown. Remaining Performance Obligations (in millions) December 31, 2023 Expected to be recognized within one year Transportation $ 27.2 Logistics Management 17.3 Expected to be recognized after one year Transportation 36.6 Logistics Management 14.7 Total $ 95.8 This disclosure does not include revenue related to performance obligations that are part of a contract with an original expected duration of one year or less, nor does it include expected consideration related to performance obligations for which the Company elects to recognize revenue in the amount it has a right to invoice (e.g., usage-based pricing terms). The following table provides information related to contract balances associated with our contracts with customers as of the dates shown. Contract Balances ( in millions ) December 31, 2023 December 31, 2022 December 31, 2021 Other current assets—Contract assets $ 23.7 $ 27.0 $ 33.8 Other current liabilities—Contract liabilities — 2.6 3.2 We generally receive payment within 40 days of completion of performance obligations. Contract assets in the table above relate to revenue in transit at the end of the reporting period. Contract liabilities relate to amounts that customers paid in advance of the associated service. Practical Expedients We elected to use the following practical expedients under ASC 606: (1) not to adjust the promised amount of consideration for the effects of a significant financing component when we expect, at contract inception, that the period between our transfer of a promised service to a customer and when the customer pays for that service will be one year or less; (2) to apply ASC 606 to a portfolio of contracts (or performance obligations) with similar characteristics, as we reasonably expect that the effects on the consolidated financial statements of applying this guidance to the portfolio would not differ materially from applying this guidance to the individual contracts (or performance obligations) within that portfolio; and (3) to recognize revenue in the Logistics Management portfolio as the amount of consideration to which we have a right to invoice, that corresponds directly with the value to the customer of the service completed to date.

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value	FAIR VALUE The table below sets forth the Company’s financial assets that are measured at fair value on a recurring, monthly basis in accordance with ASC 820. Fair Value at (in millions) Level in Fair December 31, 2023 December 31, 2022 Equity investment in TuSimple (1) 1 $ 0.3 $ 0.6 Marketable securities (2) 2 57.2 45.9 (1) Our equity investment in TuSimple is classified as Level 1 in the fair value hierarchy as shares of TuSimple’s Class A common stock are traded on the NASDAQ. See Note 5, Investments, for additional information . (2) Marketable securities are classified as Level 2 in the fair value hierarchy as they are valued based on quoted prices for similar assets in active markets or quoted prices for identical or similar assets in markets that are not active. See Note 5, Investments , for additional information. The fair value of the Company’s unsecured debt was $183.2 million and $199.1 million as of December 31, 2023 and 2022, respectively. The carrying value of the Company’s debt was $185.0 million and $205.0 million as of December 31, 2023 and 2022, respectively. The fair value of our debt was calculated using a fixed rate debt portfolio with similar terms and maturities, which is based on the borrowing rates available to us in the applicable year. This valuation used Level 2 inputs. The recorded values of cash, trade accounts receivable, lease receivables, trade accounts payable, and amounts outstanding under revolving credit agreements approximate fair values. We measure non-financial assets, such as assets held for sale and other long-lived assets, at fair value when there is an indicator of impairment and only when we recognize an impairment loss. The table below sets forth the Company’s non-financial assets that were measured at fair value on a non-recurring basis during 2023. (in millions) Level in Fair Fair Value at December 31, 2023 Assets held for sale (1) 2 $ 6.4 (1) Our held for sale transportation equipment is evaluated for impairment using market data upon classification as held for sale or as impairment indicators are present. If the carrying value of the assets held for sale exceeds the fair value, an impairment is recorded. All of the assets held for sale at December 31, 2023 were recorded at fair value. Refer to Note 1, Summary of Significant Accounting Policies, for further details on impairment charges. As part of our acquisitions, certain assets acquired and liabilities assumed were recorded at their fair values as of the acquisition date. Refer to Note 2, Acquisitions, for further details.

Investments

Investments	12 Months Ended
	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Investments	INVESTMENTS Marketable Securities The following table presents the maturities and values of our marketable securities as of the dates shown. December 31, 2023 December 31, 2022 (in millions, except maturities in months) Maturities Amortized Cost Fair Value Amortized Cost Fair Value U.S. treasury and government agencies 8 to 86 $ 24.9 $ 22.9 $ 21.9 $ 19.3 Corporate debt securities 4 to 112 20.0 19.2 16.0 14.9 State and municipal bonds 6 to 178 15.5 15.1 12.4 11.7 Total marketable securities $ 60.4 $ 57.2 $ 50.3 $ 45.9 Equity Investments without Readily Determinable Fair Values The Company’s primary strategic equity investments without readily determinable fair values include Platform Science, Inc., a provider of telematics and fleet management tools; MLSI, a transportation technology development company and ChemDirect, a business to business digital marketplace for the chemical industry. These investments are being accounted for under ASC 321, Investments - Equity Securities, using the measurement alternative, and their combined values as of December 31, 2023 and 2022 were $121.8 million and $86.0 million, respectively. If the Company identifies observable price changes for identical or similar securities of the same issuer, the equity security is measured at fair value as of the date the observable transaction occurred using Level 3 inputs. In addition to our investment in MLSI, we also hold a $10.0 million note receivable from MLSI as of December 31, 2023. The note was funded during the first quarter of 2023, is subject to interest over its term, and matures in March 2030. The following table summarizes the activity related to these equity investments during the periods presented. Year Ended December 31, (in millions) 2023 2022 2021 Investment in equity securities $ 15.8 $ 24.0 $ — Upward adjustments (1) 20.0 25.8 13.9 Cumulative upward adjustments 72.0 (1) Our updated investment values were determined using the backsolve method, a valuation approach that primarily uses an option pricing model to value shares based on the price paid for recently issued shares. Equity Investments with Readily Determinable Fair Values Our non-controlling interest in TuSimple is accounted for under ASC 321, Investments - Equity Securities . In the years ended December 31, 2023 and 2022, the Company recognized pre-tax net losses of $0.3 million and $12.1 million, respectively, on its investment in TuSimple. See Note 4, Fair Value , for additional information on the fair value of our investment in TuSimple. Equity Method Investment In the second quarter of 2023, the Company invested $5.0 million consisting primarily of internal use software and cash in exchange for a 50% non-controlling ownership interest in Scope 23 LLC, an entity that provides a platform for shippers to track and manage their greenhouse gas emissions. Our interest is being accounted for under ASC 323, Investments - Equity Method and Joint Ventures. For the year ended December 31, 2023, we recorded losses in the amount of $0.1 million related to our investment, and the carrying value of our investment was $4.9 million as of December 31, 2023. All of our equity investments, as well as our note receivable from MLSI, are included in internal use software and other noncurrent assets on the consolidated balance sheets. Gains or losses on our equity investments are recognized within other expenses (income)—net on the consolidated statements of comprehensive income.

Goodwill and Other Intangibles

Goodwill and Other Intangibles	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles	GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill represents the excess of the purchase price of acquisitions over the fair value of the identifiable net assets acquired. The following table shows changes to our goodwill balances by segment during the years ended December 31, 2023 and 2022. (in millions) Truckload Logistics Total Balance at December 31, 2021 $ 226.3 $ 14.2 $ 240.5 Acquisition (see Note 2) 7.7 — 7.7 Acquisition adjustments (see Note 2) (20.0) — (20.0) Balance at December 31, 2022 214.0 14.2 228.2 Acquisition (see Note 2) 104.6 — 104.6 Acquisition adjustments (see Note 2) (1.1) — (1.1) Balance at December 31, 2023 $ 317.5 $ 14.2 $ 331.7 During the year ended December 31, 2023, we recorded goodwill and made measurement period adjustments in conjunction with the acquisition of M&M which was recorded within the Truckload segment. Refer to Note 2, Acquisitions, for further details. At December 31, 2023 and 2022, our Truckload segment had accumulated goodwill impairment charges of $34.6 million. Goodwill is tested for impairment at least annually using the discounted cash flow, guideline public company, and guideline transaction methods to calculate the fair values of our reporting units. Key inputs used in the discounted cash flow approach include growth rates for sales and operating profit, perpetuity growth assumptions, and discount rates. Key inputs used in the guideline public company and guideline transaction methods include EBITDA valuation multiples of comparable companies and transactions. If interest rates rise, growth rates decrease, or EBITDA valuation multiples of comparable companies and transactions decline, the calculated fair values of our reporting units will decrease, which could impact the results of our goodwill impairment tests. During the fourth quarter of 2023 and 2022, annual impairment tests were performed for our reporting units with goodwill as of October 31, our assessment date. In 2023, as a result of reorganizing the operating segments within Truckload, two goodwill impairment tests were performed within our Truckload segment, one before the operating segment reorganization and one after the operating segment reorganization. Refer to Note 14, Segment Reporting, for further details on the segment reorganization. No impairments resulted as part of the 2023 or 2022 annual impairment tests. During the year ended December 31, 2023, we recorded $40.3 million of customer relationships, $4.1 million of trademarks, and $5.4 million of non-compete agreements related to the acquisition of M&M. The weighted-average amortization period is 15.0 years for customer relationships and trademarks and 5.0 years for non-compete agreements for a total weighted-average amortization period of 13.9 years. Refer to Note 2, Acquisitions, for further details. The identifiable finite lived intangible assets other than goodwill listed below are included in internal use software and other noncurrent assets on the consolidated balance sheets. December 31, 2023 December 31, 2022 (in millions) Gross Accumulated Amortization Net Gross Accumulated Amortization Net Customer relationships $ 43.5 $ 1.8 $ 41.7 $ 3.2 $ 0.3 $ 2.9 Trademarks 10.9 1.5 9.4 6.8 0.7 6.1 Non-compete agreements 5.4 0.4 5.0 — — — Total intangible assets $ 59.8 $ 3.7 $ 56.1 $ 10.0 $ 1.0 $ 9.0 Amortization expense for intangible assets was $2.7 million and $1.0 million for the year ended December 31, 2023 and December 31, 2022, respectively. Estimated future amortization expense related to intangible assets is as follows: (in millions) December 31, 2023 2024 $ 5.0 2025 5.0 2026 5.0 2027 5.0 2028 4.6 2029 and thereafter 31.5 Total $ 56.1

Debt and Credit Facilities

Debt and Credit Facilities	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Debt and Credit Facilities	DEBT AND CREDIT FACILITIES As of December 31, 2023 and 2022, debt included the following: (in millions) December 31, 2023 December 31, 2022 Unsecured senior notes: principal payable at maturities ranging from 2024 through 2028; interest payable in semiannual installments through the same timeframe; weighted-average interest rate of 3.68% and 3.93% for 2023 and 2022, respectively $ 185.0 $ 205.0 Credit agreement: matures November 2027; variable rate interest payments due monthly based on the Term SOFR; weighted-average interest rate of 6.43% for 2023. 45.0 — Receivables purchase agreement: matures July 2024; variable rate interest payments due monthly based on the Term SOFR; weighted-average interest rate of 6.28% for 2023. 60.0 — Total debt and credit facilities 290.0 205.0 Current maturities (100.0) (70.0) Long-term debt and credit facilities $ 190.0 $ 135.0 Scheduled future debt principal payments are as follows: (in millions) December 31, 2023 2024 $ 100.0 2025 95.0 2026 — 2027 45.0 2028 50.0 Total $ 290.0 Our Credit Agreement (the “2022 Credit Facility”) provides borrowing capacity of $250.0 million and allows us to request an additional increase in total commitment by up to $150.0 million, for a total potential commitment of $400.0 million through November 2027. The 2022 Credit Facility also provides a sublimit of $100.0 million to be used for the issuance of letters of credit. Standby letters of credit under these agreements amounted to $0.4 million and $0.1 million on December 31, 2023 and 2022, respectively, and were primarily related to the requirements of certain of our real estate leases. Our Receivables Purchase Agreement (the “2021 Receivables Purchase Agreement”) allows us to borrow funds against qualifying trade receivables at rates based on the Term SOFR up to $150.0 million and provides for the issuance of standby letters of credit through July 2024. At December 31, 2023 and 2022, standby letters of credit under this agreement amounted to $81.4 million and $77.1 million and were primarily related to the requirements of certain of our insurance obligations. On August 30, 2023, Schneider National Leasing, Inc. (“SNL”), a wholly-owned subsidiary of the Company, issued and sold $50.0 million in notes pursuant to the Private Shelf Agreement to certain affiliates of PGIM, Inc. (“Prudential”). The notes represent senior promissory notes of SNL, bear interest of 5.63% per year, are payable semiannually, and will mature on August 30, 2028. The credit agreements and the guaranty agreements relating to the unsecured senior notes contain various financial and other covenants, including required minimum consolidated net worth, consolidated net debt, limitations on indebtedness, transactions with affiliates, shareholder debt, and restricted payments. The credit agreements and senior notes contain change of control provisions pursuant to which a change of control is defined to mean the Schneider family no longer owns more than 50% of the combined voting power of our capital shares. A change of control event causes an immediate termination of unused commitments under the credit agreements and requires repayment of all outstanding borrowings plus accrued interest and fees. The senior notes require us to provide notice to the note holders offering prepayment of the outstanding principal along with interest accrued to the date of prepayment. The prepayment date is required to be within 20 to 60 days from the date of notice. At December 31, 2023, the Company was in compliance with all financial covenants.

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Operating Leases	LEASES As Lessee We lease real estate and equipment under operating and finance leases. Our real estate operating leases include operating centers, distribution warehouses, offices, and drop yards. Our non-real estate operating leases and finance leases include transportation, office, yard, and warehouse equipment, in addition to truck washes. The majority of our leases include an option to extend the lease, and a small number include an option to terminate the lease early, which may include a termination payment. If we are reasonably certain to exercise an option to extend a lease, the extension period is included as part of the right-of-use asset and lease liability. For our real estate leases, we have elected to apply the recognition requirement to leases of twelve months or less; therefore, a lease right-of-use asset and liability will be recognized for all of these leases. For our equipment leases, we have elected to not apply the recognition requirements to leases of twelve months or less. These leases will be expensed on a straight-line basis, and no operating lease right-of-use asset or liability will be recorded. We have also elected to not separate the different components within the contract for our leases; therefore, all fixed costs associated with the lease are included in the right-of-use asset and lease liability. This often relates to the requirement for us to pay a proportionate share of real estate taxes, insurance, common area maintenance, and other operating costs in addition to a base or fixed rent. Some of our leases have variable payment amounts, and the variable portions of those payments are excluded from the right-of-use asset and lease liability. At the inception of our contracts, we determine if the contract is or contains a lease. A contract is or contains a lease if it conveys the right to control the use of an identified asset for a period of time in exchange for consideration. None of our leases contain restrictions or covenants that restrict us from incurring other financial obligations. Right-of-use lease assets and liabilities are recognized based on the present value of the future lease payments over the term. Our incremental borrowing rates are used as the discount rates for leases and are determined based on U.S. Treasury rates plus an applicable margin. Schneider uses multiple discount rates based on lease terms. In conjunction with our acquisition of M&M, the Company entered into nine related party leases. The leases are for the use of shop, warehouse, office, and drop yard locations throughout the country. The leases run through 2026 and the related lease payments are not material. The following table presents our net lease costs for the years ended December 31, 2023, 2022, and 2021. Financial Statement Classification Year Ended December 31, (in millions) 2023 2022 2021 Operating lease cost Operating lease cost Operating supplies and expenses—net $ 36.7 $ 32.9 $ 31.3 Short-term lease cost (1) Operating supplies and expenses—net 7.7 6.3 3.0 Finance lease cost Amortization of right-of-use assets Depreciation and amortization 3.9 2.2 0.8 Interest on lease liabilities Interest expense 0.5 0.2 0.1 Variable lease cost Operating supplies and expenses—net 2.7 2.9 0.9 Sublease income Operating supplies and expenses—net (2.3) (3.0) (4.5) Total net lease cost $ 49.2 $ 41.5 $ 31.6 (1) Includes short-term lease costs for leases twelve months or less, including those with a duration of one month or less. As of December 31, 2023 and 2022, remaining lease terms and discount rates under operating and finance leases were as follows: December 31, 2023 December 31, 2022 Weighted-average remaining lease term Operating leases 3.8 years 3.2 years Finance leases 3.2 years 3.2 years Weighted-average discount rate (1) Operating leases 5.0 % 3.7 % Finance leases 5.0 % 4.3 % (1) Determined based on a portfolio approach. Additional information related to our leases is as follows: Year Ended December 31, (in millions) 2023 2022 2021 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for operating leases $ 36.7 $ 33.3 $ 31.4 Operating cash flows for finance leases 0.5 0.2 0.1 Financing cash flows for finance leases 3.9 2.0 0.8 Right-of-use assets obtained in exchange for new lease liabilities Operating leases $ 52.6 $ 23.7 $ 28.7 Finance leases 5.8 6.8 4.1 Operating lease right-of-use assets, current operating lease liabilities, and noncurrent operating lease liabilities are included in internal use software and other noncurrent assets, other current liabilities, and other noncurrent liabilities, respectively, in the consolidated balance sheets. Operating lease right-of-use assets were $82.9 million and $63.5 million as of December 31, 2023 and 2022, respectively. We recorded no impairment losses on our operating lease right-of-use assets for the years ended December 31, 2023 or 2021, and a $0.1 million impairment loss for 2022. At December 31, 2023, future lease payments under operating and finance leases were as follows: (in millions) Operating Leases Finance Leases 2024 $ 33.8 $ 4.9 2025 25.0 3.9 2026 15.5 2.3 2027 8.6 1.2 2028 6.7 0.7 2029 and thereafter 7.3 — Total 96.9 13.0 Amount representing interest (8.9) (0.9) Present value of lease payments 88.0 12.1 Current maturities (30.4) (4.5) Long-term lease obligations $ 57.6 $ 7.6 For certain of our real estate leases, there are options contained within the lease agreement to extend beyond the initial lease term. The Company recognizes options as right-of-use assets and lease liabilities when deemed reasonably certain to be exercised. Future operating lease payments at December 31, 2023 include $1.0 million related to options to extend lease terms that we are reasonably certain to exercise. As of December 31, 2023, we had leases that were signed but had not yet commenced totaling $0.5 million over their lease terms. These leases will commence in 2024 and have lease terms of three The consolidated balance sheets include right-of-use assets acquired under finance leases as components of property and equipment as of December 31, 2023 and 2022. Real and other property under finance leases are being amortized to a zero net book value over the initial lease term. (in millions) December 31, 2023 December 31, 2022 Transportation equipment $ 7.9 $ 3.1 Real property 1.1 1.0 Other property 10.4 8.9 Accumulated amortization (7.7) (3.3) Total $ 11.7 $ 9.7 As Lessor We finance various types of transportation-related equipment for independent third parties under lease contracts which are generally for one In addition, we also collect one-time administrative fees and heavy vehicle use tax on our leases. We have elected to not separate the different components within the contract as the administrative fees were not material for the years ended December 31, 2023, 2022, and 2021. We have also elected to exclude all taxes assessed by a governmental authority from the consideration (e.g., heavy vehicle use tax). All of our leases require fixed payments, therefore we have no variable payment provisions. As of December 31, 2023 and 2022, investments in lease receivables were as follows: (in millions) December 31, 2023 December 31, 2022 Future minimum payments to be received on leases $ 161.8 $ 198.4 Guaranteed residual lease values 103.9 126.1 Total minimum lease payments to be received 265.7 324.5 Unearned income (42.2) (50.2) Net investment in leases $ 223.5 $ 274.3 The amounts to be received on lease receivables as of December 31, 2023 were as follows: (in millions) December 31, 2023 2024 $ 118.2 2025 86.8 2026 60.2 2027 0.5 Total undiscounted lease cash flows 265.7 Amount representing interest (42.2) Present value of lease receivables 223.5 Current lease receivables—net of allowance (93.3) Long-term lease receivable $ 130.2 Prior to entering a lease contract, we assess the credit quality of the potential lessee using credit checks and other relevant factors, ensuring that the inherent credit risk is consistent with our existing lease portfolio. Given our leases have fully guaranteed residual values and we can take possession of the transportation-related equipment in the event of default, we do not categorize net investment in leases by different credit quality indicators upon origination. We monitor our lease portfolio weekly by tracking amounts past due, days past due, and outstanding maintenance account balances, including performing subsequent credit checks as needed. Our net investment in leases with any portion past due as of December 31, 2023 was $71.0 million, which includes both current and future lease payments. Lease payments on our lease receivables are generally due on a weekly basis and are classified as past due when the weekly payment is not received by its due date. As of December 31, 2023, our lease payments past due were $3.4 million. Leases are generally placed on nonaccrual status (nonaccrual of interest and other fees) when a payment becomes 90 days past due or upon notification of bankruptcy, death, or other instances management concludes collectability is not reasonably assured. The accrual of interest and other fees resumes when all payments are less than 60 days past due. The table below provides additional information on our sales-type leases. Revenue and cost of goods sold are recorded in operating revenues and operating supplies and expenses—net in the consolidated statements of comprehensive income, respectively. Year Ended December 31, (in millions) 2023 2022 2021 Revenue $ 206.1 $ 195.0 $ 206.1 Cost of goods sold (174.9) (161.8) (177.6) Operating profit $ 31.2 $ 33.2 $ 28.5 Interest income on lease receivable $ 36.1 $ 37.0 $ 32.4
Finance Leases	LEASES As Lessee We lease real estate and equipment under operating and finance leases. Our real estate operating leases include operating centers, distribution warehouses, offices, and drop yards. Our non-real estate operating leases and finance leases include transportation, office, yard, and warehouse equipment, in addition to truck washes. The majority of our leases include an option to extend the lease, and a small number include an option to terminate the lease early, which may include a termination payment. If we are reasonably certain to exercise an option to extend a lease, the extension period is included as part of the right-of-use asset and lease liability. For our real estate leases, we have elected to apply the recognition requirement to leases of twelve months or less; therefore, a lease right-of-use asset and liability will be recognized for all of these leases. For our equipment leases, we have elected to not apply the recognition requirements to leases of twelve months or less. These leases will be expensed on a straight-line basis, and no operating lease right-of-use asset or liability will be recorded. We have also elected to not separate the different components within the contract for our leases; therefore, all fixed costs associated with the lease are included in the right-of-use asset and lease liability. This often relates to the requirement for us to pay a proportionate share of real estate taxes, insurance, common area maintenance, and other operating costs in addition to a base or fixed rent. Some of our leases have variable payment amounts, and the variable portions of those payments are excluded from the right-of-use asset and lease liability. At the inception of our contracts, we determine if the contract is or contains a lease. A contract is or contains a lease if it conveys the right to control the use of an identified asset for a period of time in exchange for consideration. None of our leases contain restrictions or covenants that restrict us from incurring other financial obligations. Right-of-use lease assets and liabilities are recognized based on the present value of the future lease payments over the term. Our incremental borrowing rates are used as the discount rates for leases and are determined based on U.S. Treasury rates plus an applicable margin. Schneider uses multiple discount rates based on lease terms. In conjunction with our acquisition of M&M, the Company entered into nine related party leases. The leases are for the use of shop, warehouse, office, and drop yard locations throughout the country. The leases run through 2026 and the related lease payments are not material. The following table presents our net lease costs for the years ended December 31, 2023, 2022, and 2021. Financial Statement Classification Year Ended December 31, (in millions) 2023 2022 2021 Operating lease cost Operating lease cost Operating supplies and expenses—net $ 36.7 $ 32.9 $ 31.3 Short-term lease cost (1) Operating supplies and expenses—net 7.7 6.3 3.0 Finance lease cost Amortization of right-of-use assets Depreciation and amortization 3.9 2.2 0.8 Interest on lease liabilities Interest expense 0.5 0.2 0.1 Variable lease cost Operating supplies and expenses—net 2.7 2.9 0.9 Sublease income Operating supplies and expenses—net (2.3) (3.0) (4.5) Total net lease cost $ 49.2 $ 41.5 $ 31.6 (1) Includes short-term lease costs for leases twelve months or less, including those with a duration of one month or less. As of December 31, 2023 and 2022, remaining lease terms and discount rates under operating and finance leases were as follows: December 31, 2023 December 31, 2022 Weighted-average remaining lease term Operating leases 3.8 years 3.2 years Finance leases 3.2 years 3.2 years Weighted-average discount rate (1) Operating leases 5.0 % 3.7 % Finance leases 5.0 % 4.3 % (1) Determined based on a portfolio approach. Additional information related to our leases is as follows: Year Ended December 31, (in millions) 2023 2022 2021 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for operating leases $ 36.7 $ 33.3 $ 31.4 Operating cash flows for finance leases 0.5 0.2 0.1 Financing cash flows for finance leases 3.9 2.0 0.8 Right-of-use assets obtained in exchange for new lease liabilities Operating leases $ 52.6 $ 23.7 $ 28.7 Finance leases 5.8 6.8 4.1 Operating lease right-of-use assets, current operating lease liabilities, and noncurrent operating lease liabilities are included in internal use software and other noncurrent assets, other current liabilities, and other noncurrent liabilities, respectively, in the consolidated balance sheets. Operating lease right-of-use assets were $82.9 million and $63.5 million as of December 31, 2023 and 2022, respectively. We recorded no impairment losses on our operating lease right-of-use assets for the years ended December 31, 2023 or 2021, and a $0.1 million impairment loss for 2022. At December 31, 2023, future lease payments under operating and finance leases were as follows: (in millions) Operating Leases Finance Leases 2024 $ 33.8 $ 4.9 2025 25.0 3.9 2026 15.5 2.3 2027 8.6 1.2 2028 6.7 0.7 2029 and thereafter 7.3 — Total 96.9 13.0 Amount representing interest (8.9) (0.9) Present value of lease payments 88.0 12.1 Current maturities (30.4) (4.5) Long-term lease obligations $ 57.6 $ 7.6 For certain of our real estate leases, there are options contained within the lease agreement to extend beyond the initial lease term. The Company recognizes options as right-of-use assets and lease liabilities when deemed reasonably certain to be exercised. Future operating lease payments at December 31, 2023 include $1.0 million related to options to extend lease terms that we are reasonably certain to exercise. As of December 31, 2023, we had leases that were signed but had not yet commenced totaling $0.5 million over their lease terms. These leases will commence in 2024 and have lease terms of three The consolidated balance sheets include right-of-use assets acquired under finance leases as components of property and equipment as of December 31, 2023 and 2022. Real and other property under finance leases are being amortized to a zero net book value over the initial lease term. (in millions) December 31, 2023 December 31, 2022 Transportation equipment $ 7.9 $ 3.1 Real property 1.1 1.0 Other property 10.4 8.9 Accumulated amortization (7.7) (3.3) Total $ 11.7 $ 9.7 As Lessor We finance various types of transportation-related equipment for independent third parties under lease contracts which are generally for one In addition, we also collect one-time administrative fees and heavy vehicle use tax on our leases. We have elected to not separate the different components within the contract as the administrative fees were not material for the years ended December 31, 2023, 2022, and 2021. We have also elected to exclude all taxes assessed by a governmental authority from the consideration (e.g., heavy vehicle use tax). All of our leases require fixed payments, therefore we have no variable payment provisions. As of December 31, 2023 and 2022, investments in lease receivables were as follows: (in millions) December 31, 2023 December 31, 2022 Future minimum payments to be received on leases $ 161.8 $ 198.4 Guaranteed residual lease values 103.9 126.1 Total minimum lease payments to be received 265.7 324.5 Unearned income (42.2) (50.2) Net investment in leases $ 223.5 $ 274.3 The amounts to be received on lease receivables as of December 31, 2023 were as follows: (in millions) December 31, 2023 2024 $ 118.2 2025 86.8 2026 60.2 2027 0.5 Total undiscounted lease cash flows 265.7 Amount representing interest (42.2) Present value of lease receivables 223.5 Current lease receivables—net of allowance (93.3) Long-term lease receivable $ 130.2 Prior to entering a lease contract, we assess the credit quality of the potential lessee using credit checks and other relevant factors, ensuring that the inherent credit risk is consistent with our existing lease portfolio. Given our leases have fully guaranteed residual values and we can take possession of the transportation-related equipment in the event of default, we do not categorize net investment in leases by different credit quality indicators upon origination. We monitor our lease portfolio weekly by tracking amounts past due, days past due, and outstanding maintenance account balances, including performing subsequent credit checks as needed. Our net investment in leases with any portion past due as of December 31, 2023 was $71.0 million, which includes both current and future lease payments. Lease payments on our lease receivables are generally due on a weekly basis and are classified as past due when the weekly payment is not received by its due date. As of December 31, 2023, our lease payments past due were $3.4 million. Leases are generally placed on nonaccrual status (nonaccrual of interest and other fees) when a payment becomes 90 days past due or upon notification of bankruptcy, death, or other instances management concludes collectability is not reasonably assured. The accrual of interest and other fees resumes when all payments are less than 60 days past due. The table below provides additional information on our sales-type leases. Revenue and cost of goods sold are recorded in operating revenues and operating supplies and expenses—net in the consolidated statements of comprehensive income, respectively. Year Ended December 31, (in millions) 2023 2022 2021 Revenue $ 206.1 $ 195.0 $ 206.1 Cost of goods sold (174.9) (161.8) (177.6) Operating profit $ 31.2 $ 33.2 $ 28.5 Interest income on lease receivable $ 36.1 $ 37.0 $ 32.4
Sales-type Leases	LEASES As Lessee We lease real estate and equipment under operating and finance leases. Our real estate operating leases include operating centers, distribution warehouses, offices, and drop yards. Our non-real estate operating leases and finance leases include transportation, office, yard, and warehouse equipment, in addition to truck washes. The majority of our leases include an option to extend the lease, and a small number include an option to terminate the lease early, which may include a termination payment. If we are reasonably certain to exercise an option to extend a lease, the extension period is included as part of the right-of-use asset and lease liability. For our real estate leases, we have elected to apply the recognition requirement to leases of twelve months or less; therefore, a lease right-of-use asset and liability will be recognized for all of these leases. For our equipment leases, we have elected to not apply the recognition requirements to leases of twelve months or less. These leases will be expensed on a straight-line basis, and no operating lease right-of-use asset or liability will be recorded. We have also elected to not separate the different components within the contract for our leases; therefore, all fixed costs associated with the lease are included in the right-of-use asset and lease liability. This often relates to the requirement for us to pay a proportionate share of real estate taxes, insurance, common area maintenance, and other operating costs in addition to a base or fixed rent. Some of our leases have variable payment amounts, and the variable portions of those payments are excluded from the right-of-use asset and lease liability. At the inception of our contracts, we determine if the contract is or contains a lease. A contract is or contains a lease if it conveys the right to control the use of an identified asset for a period of time in exchange for consideration. None of our leases contain restrictions or covenants that restrict us from incurring other financial obligations. Right-of-use lease assets and liabilities are recognized based on the present value of the future lease payments over the term. Our incremental borrowing rates are used as the discount rates for leases and are determined based on U.S. Treasury rates plus an applicable margin. Schneider uses multiple discount rates based on lease terms. In conjunction with our acquisition of M&M, the Company entered into nine related party leases. The leases are for the use of shop, warehouse, office, and drop yard locations throughout the country. The leases run through 2026 and the related lease payments are not material. The following table presents our net lease costs for the years ended December 31, 2023, 2022, and 2021. Financial Statement Classification Year Ended December 31, (in millions) 2023 2022 2021 Operating lease cost Operating lease cost Operating supplies and expenses—net $ 36.7 $ 32.9 $ 31.3 Short-term lease cost (1) Operating supplies and expenses—net 7.7 6.3 3.0 Finance lease cost Amortization of right-of-use assets Depreciation and amortization 3.9 2.2 0.8 Interest on lease liabilities Interest expense 0.5 0.2 0.1 Variable lease cost Operating supplies and expenses—net 2.7 2.9 0.9 Sublease income Operating supplies and expenses—net (2.3) (3.0) (4.5) Total net lease cost $ 49.2 $ 41.5 $ 31.6 (1) Includes short-term lease costs for leases twelve months or less, including those with a duration of one month or less. As of December 31, 2023 and 2022, remaining lease terms and discount rates under operating and finance leases were as follows: December 31, 2023 December 31, 2022 Weighted-average remaining lease term Operating leases 3.8 years 3.2 years Finance leases 3.2 years 3.2 years Weighted-average discount rate (1) Operating leases 5.0 % 3.7 % Finance leases 5.0 % 4.3 % (1) Determined based on a portfolio approach. Additional information related to our leases is as follows: Year Ended December 31, (in millions) 2023 2022 2021 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for operating leases $ 36.7 $ 33.3 $ 31.4 Operating cash flows for finance leases 0.5 0.2 0.1 Financing cash flows for finance leases 3.9 2.0 0.8 Right-of-use assets obtained in exchange for new lease liabilities Operating leases $ 52.6 $ 23.7 $ 28.7 Finance leases 5.8 6.8 4.1 Operating lease right-of-use assets, current operating lease liabilities, and noncurrent operating lease liabilities are included in internal use software and other noncurrent assets, other current liabilities, and other noncurrent liabilities, respectively, in the consolidated balance sheets. Operating lease right-of-use assets were $82.9 million and $63.5 million as of December 31, 2023 and 2022, respectively. We recorded no impairment losses on our operating lease right-of-use assets for the years ended December 31, 2023 or 2021, and a $0.1 million impairment loss for 2022. At December 31, 2023, future lease payments under operating and finance leases were as follows: (in millions) Operating Leases Finance Leases 2024 $ 33.8 $ 4.9 2025 25.0 3.9 2026 15.5 2.3 2027 8.6 1.2 2028 6.7 0.7 2029 and thereafter 7.3 — Total 96.9 13.0 Amount representing interest (8.9) (0.9) Present value of lease payments 88.0 12.1 Current maturities (30.4) (4.5) Long-term lease obligations $ 57.6 $ 7.6 For certain of our real estate leases, there are options contained within the lease agreement to extend beyond the initial lease term. The Company recognizes options as right-of-use assets and lease liabilities when deemed reasonably certain to be exercised. Future operating lease payments at December 31, 2023 include $1.0 million related to options to extend lease terms that we are reasonably certain to exercise. As of December 31, 2023, we had leases that were signed but had not yet commenced totaling $0.5 million over their lease terms. These leases will commence in 2024 and have lease terms of three The consolidated balance sheets include right-of-use assets acquired under finance leases as components of property and equipment as of December 31, 2023 and 2022. Real and other property under finance leases are being amortized to a zero net book value over the initial lease term. (in millions) December 31, 2023 December 31, 2022 Transportation equipment $ 7.9 $ 3.1 Real property 1.1 1.0 Other property 10.4 8.9 Accumulated amortization (7.7) (3.3) Total $ 11.7 $ 9.7 As Lessor We finance various types of transportation-related equipment for independent third parties under lease contracts which are generally for one In addition, we also collect one-time administrative fees and heavy vehicle use tax on our leases. We have elected to not separate the different components within the contract as the administrative fees were not material for the years ended December 31, 2023, 2022, and 2021. We have also elected to exclude all taxes assessed by a governmental authority from the consideration (e.g., heavy vehicle use tax). All of our leases require fixed payments, therefore we have no variable payment provisions. As of December 31, 2023 and 2022, investments in lease receivables were as follows: (in millions) December 31, 2023 December 31, 2022 Future minimum payments to be received on leases $ 161.8 $ 198.4 Guaranteed residual lease values 103.9 126.1 Total minimum lease payments to be received 265.7 324.5 Unearned income (42.2) (50.2) Net investment in leases $ 223.5 $ 274.3 The amounts to be received on lease receivables as of December 31, 2023 were as follows: (in millions) December 31, 2023 2024 $ 118.2 2025 86.8 2026 60.2 2027 0.5 Total undiscounted lease cash flows 265.7 Amount representing interest (42.2) Present value of lease receivables 223.5 Current lease receivables—net of allowance (93.3) Long-term lease receivable $ 130.2 Prior to entering a lease contract, we assess the credit quality of the potential lessee using credit checks and other relevant factors, ensuring that the inherent credit risk is consistent with our existing lease portfolio. Given our leases have fully guaranteed residual values and we can take possession of the transportation-related equipment in the event of default, we do not categorize net investment in leases by different credit quality indicators upon origination. We monitor our lease portfolio weekly by tracking amounts past due, days past due, and outstanding maintenance account balances, including performing subsequent credit checks as needed. Our net investment in leases with any portion past due as of December 31, 2023 was $71.0 million, which includes both current and future lease payments. Lease payments on our lease receivables are generally due on a weekly basis and are classified as past due when the weekly payment is not received by its due date. As of December 31, 2023, our lease payments past due were $3.4 million. Leases are generally placed on nonaccrual status (nonaccrual of interest and other fees) when a payment becomes 90 days past due or upon notification of bankruptcy, death, or other instances management concludes collectability is not reasonably assured. The accrual of interest and other fees resumes when all payments are less than 60 days past due. The table below provides additional information on our sales-type leases. Revenue and cost of goods sold are recorded in operating revenues and operating supplies and expenses—net in the consolidated statements of comprehensive income, respectively. Year Ended December 31, (in millions) 2023 2022 2021 Revenue $ 206.1 $ 195.0 $ 206.1 Cost of goods sold (174.9) (161.8) (177.6) Operating profit $ 31.2 $ 33.2 $ 28.5 Interest income on lease receivable $ 36.1 $ 37.0 $ 32.4

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The components of the provision for income taxes for the years ended December 31, 2023, 2022, and 2021 were as follows: (in millions) 2023 2022 2021 Current: Federal $ 15.2 $ 28.1 $ 112.5 Foreign (10.1) 15.8 — State 6.7 19.3 22.1 11.8 63.2 134.6 Deferred: Federal 47.7 82.8 0.8 State and other 8.1 0.2 1.2 55.8 83.0 2.0 Total provision for income taxes $ 67.6 $ 146.2 $ 136.6 For the years ended December 31, 2023 and 2022, the foreign (benefit) provision for income taxes is primarily related to the finalization of the tax impact on the sale of our Canadian facility; for the year ended December 31, 2021, the foreign provision is insignificant in relation to our overall provision. The provision for income taxes for the years ended December 31, 2023, 2022, and 2021 differed from the amounts computed using the federal statutory rate in effect as follows: 2023 2022 2021 (in millions, except percentages) Dollar Impact Rate Dollar Impact Rate Dollar Impact Rate Income tax at federal statutory rate $ 64.3 21.0 % $ 126.8 21.0 % $ 113.8 21.0 % State tax—net of federal effect 13.8 4.5 15.4 2.6 18.9 3.5 Change in valuation allowance (10.7) (3.5) 10.7 1.8 — — Other—net 0.2 0.1 (6.7) (1.2) 3.9 0.7 Total provision for income taxes $ 67.6 22.1 % $ 146.2 24.2 % $ 136.6 25.2 % The components of the net deferred tax liability included in deferred income taxes in the consolidated balance sheets as of December 31, 2023 and 2022 were as follows: (in millions) 2023 2022 Deferred tax assets: Compensation and employee benefits $ 8.1 $ 7.8 Operating lease liabilities 21.4 16.4 State net operating losses and credit carryforwards 10.5 9.4 Foreign capital loss carryforward — 10.7 Other 14.2 14.9 Total gross deferred tax assets 54.2 59.2 Valuation allowance (0.9) (12.8) Total deferred tax assets—net of valuation allowance 53.3 46.4 Deferred tax liabilities: Property and equipment 596.3 548.0 Prepaid expenses 6.8 5.6 Intangible assets 8.1 2.4 Operating lease right-of-use assets 19.6 15.2 Other 18.2 13.4 Total gross deferred tax liabilities 649.0 584.6 Net deferred tax liability $ 595.7 $ 538.2 Unrecognized Tax Benefits Our unrecognized tax benefits as of December 31, 2023 would reduce the provision for income taxes if subsequently recognized. Potential interest and penalties related to unrecognized tax benefits are recorded in income tax expense. Accrued interest and penalties for such unrecognized tax benefits as of December 31, 2023 and 2022 were $2.7 million and $3.1 million, respectively. We expect no significant increases or decreases for unrecognized tax benefits during the twelve months immediately following the December 31, 2023 reporting date. As of December 31, 2023, 2022, and 2021, a reconciliation of the beginning and ending unrecognized tax benefits, which is recorded as other noncurrent liabilities in the consolidated balance sheets, is as follows: (in millions) 2023 2022 2021 Gross unrecognized tax benefits—beginning of year $ 6.0 $ 5.2 $ 4.3 Gross increases—tax positions related to current year — 1.0 0.9 Gross decreases—tax positions taken in prior years (0.5) (0.2) — Settlements (1.1) — — Gross unrecognized tax benefits—end of year $ 4.4 $ 6.0 $ 5.2 Tax Examinations We file a U.S. federal income tax return, as well as income tax returns in a majority of state tax jurisdictions. We also file returns in foreign jurisdictions. The years 2020, 2021, and 2022 are open for examination by the IRS, and various years are open for examination by state and foreign tax authorities. In October 2023, the statute for 2019 expired. State and foreign jurisdictional statutes of limitations generally range from three to four years. Carryforwards As of December 31, 2023, we had $169.8 million of state net operating loss carryforwards which are subject to expiration from 2024 to 2044. We also had state credit carryforwards of $1.2 million, which are subject to expiration from 2027 to 2038, and no capital loss carryforwards. The deferred tax assets related to carryforwards at December 31, 2023 were $9.4 million for state net operating loss carryforwards and $0.4 million for state credit carryforwards. Carryforwards are reviewed for recoverability based on historical taxable income, the expected reversals of existing temporary differences, tax-planning strategies, and projections of future taxable income. At December 31, 2023, we carried a total valuation allowance of $0.9 million, which was against state deferred tax assets.

Common Equity

Common Equity	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Common Equity	COMMON EQUITY Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share for the years ended December 31, 2023, 2022, and 2021. Year Ended December 31, (in millions, except per share data) 2023 2022 2021 Numerator: Net income available to common shareholders $ 238.5 $ 457.8 $ 405.4 Denominator: Weighted average common shares outstanding 177.3 177.9 177.6 Dilutive effect of share-based awards and options outstanding 0.8 0.9 0.5 Weighted average diluted common shares outstanding (1) 178.2 178.8 178.1 Basic earnings per common share $ 1.35 $ 2.57 $ 2.28 Diluted earnings per common share 1.34 2.56 2.28 (1) Weighted average diluted common shares outstanding may not sum due to rounding. The calculation of diluted earnings per share excluded 0.2 million, 0.3 million, and 0.8 million share-based awards and options that had an anti-dilutive effect for the years ended December 31, 2023, 2022, and 2021, respectively. Common Shares Outstanding As of December 31, 2023, 2022, and 2021, we had 83,029,500 shares of Class A common stock outstanding. There were no changes to the number of shares of Class A common stock outstanding for the years ended December 31, 2023, 2022, and 2021. The following table shows changes to our Class B common shares outstanding for the years ended December 31, 2023, 2022, and 2021. Year Ended December 31, 2023 2022 2021 Outstanding at beginning of period 94,993,144 94,626,740 94,311,653 Repurchases of common stock (2,505,267) — — Share issuances 681,642 306,071 370,226 Exercise of employee stock options 6,000 150,692 42,904 Shares withheld for employee taxes (244,277) (90,359) (98,043) Outstanding at end of period 92,931,242 94,993,144 94,626,740 In January 2023, our Board approved a share repurchase program under which the Company is authorized to repurchase up to $150.0 million of its Class A and/or Class B common shares. The program does not obligate the Company to repurchase a minimum number of shares and is intended to help offset the dilutive effect of equity grants to employees over time. Under this program, the Company may repurchase shares in privately negotiated and/or open market transactions. As of December 31, 2023, the Company had repurchased $66.2 million of the $150.0 million authorized under the repurchase program. Capital Stock and Rights Our common equity consists of 750.0 million authorized shares of Class B common stock, entitled to one vote per share, and 250.0 million authorized shares of Class A common stock, entitled to 10 votes per share. Our Class B common stock has traded on the NYSE under the symbol “SNDR” since our IPO in April 2017. Our Class A common stock is held by the Voting Trust for the benefit of members of the Schneider family. Each share of Class A common stock is convertible into one share of Class B common stock. Our Class B common stock is not convertible into any other shares of our capital stock. There is no public trading market for our Class A common stock. Our Amended and Restated Articles of Incorporation provide that holders of our Class A and Class B common stock will be treated equally and ratably on a per share basis with respect to dividends, unless disparate treatment is approved in advance by the vote of the holders of a majority of the outstanding shares of our Class A and Class B common stock, each voting as a separate group. In the event of a dissolution, liquidation, or winding up of the company, the holders of Class A and Class B common stock are entitled to share ratably in all assets and funds remaining after payment of liabilities, subject to prior distribution rights of preferred stock, if any, then outstanding, unless disparate treatment is approved in advance by the vote of the holders of a majority of the outstanding shares of our Class A and Class B common stock, each voting as a separate group. Additionally, a total of 50.0 million shares of preferred stock is authorized, none of which is currently outstanding. The Company has no present plans to issue any preferred stock. Dividends Declared During 2023, 2022, and 2021, the Company declared cash dividends totaling $0.36, $0.32, and $0.28 per share, respectively. Subsequent Event - Dividends Declared In January 2024, our Board declared a quarterly cash dividend for the first fiscal quarter of 2024 in the amount of $0.095 per share to holders of our Class A and Class B common stock. The dividend is payable to shareholders of record at the close of business on March 8, 2024 and is expected to be paid on April 9, 2024.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS We sponsor defined contribution plans for certain eligible employees. Under these plans, annual contribution levels, as defined in the plan agreements, are based upon years of service. Expense under these plans totaled $13.5 million, $12.1 million, and $11.3 million in 2023, 2022, and 2021, respectively, and is classified in salaries, wages, and benefits in the consolidated statements of comprehensive income. We also have a savings plan, organized pursuant to Section 401(k) of the Internal Revenue Code, to provide employees with additional income upon retirement. Under the terms of the plan, substantially all employees may contribute a percentage of their annual compensation, as defined, to the plan. We make contributions to the plan, up to a maximum amount per employee, based on a percentage of employee contributions. Our net expense under this plan was $15.4 million, $14.2 million, and $12.9 million in 2023, 2022, and 2021, respectively.

Share-based Compensation

Share-based Compensation	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Share-based Compensation	SHARE-BASED COMPENSATION We grant various equity-based awards relating to Class B common stock to employees under our 2017 Omnibus Incentive Plan (“the Plan”). These awards have historically consisted of restricted shares, RSUs, performance-based restricted shares (“performance shares”), PSUs, and non-qualified stock options. Performance shares and PSUs granted prior to 2021 are earned based on attainment of threshold performance of earnings and return on capital targets. Beginning with grants in 2021, in addition to achievement of earnings and return on capital targets, a multiplier is applied to performance share and PSU achievement based on rTSR against peers over the performance period. We account for our restricted shares, RSUs, performance shares, PSUs, and non-qualified stock options granted as equity awards in accordance with the applicable accounting standards for these types of share-based payments. These standards require that the cost of the awards be recognized in our consolidated financial statements based on the grant date fair value of those awards. This cost is recognized over the period for which an employee is required to provide service in exchange for the award, subject to the attainment of performance metrics established for performance shares and PSUs. Share-based compensation expense is recorded in salaries, wages, and benefits in our consolidated statements of comprehensive income, along with other compensation expenses to employees. The following table summarizes the components of our employee share-based compensation expense. Year Ended December 31, (in millions) 2023 2022 2021 Restricted shares and RSUs $ 9.7 $ 5.7 $ 5.8 Performance shares and PSUs 3.9 8.7 6.1 Non-qualified stock options 2.0 1.4 1.4 Share-based compensation expense $ 15.6 $ 15.8 $ 13.3 Related tax benefit $ 3.5 $ 3.8 $ 3.3 As of December 31, 2023, we had $16.4 million of pre-tax unrecognized compensation cost related to outstanding share-based compensation awards expected to be recognized over a weighted average period of 1.9 years. Restricted Shares and RSUs Under the Plan, RSUs granted in 2023 vest ratably over a period of three years while the majority of the restricted shares and RSUs granted prior to 2023 vest ratably over a period of four years beginning approximately one year after the date of grant and are subject to continued employment through the vesting date or retirement eligibility. Dividend equivalents, equal to dividends paid on our common shares during the vesting period, are tracked and accumulated for each restricted share and RSU. The dividend equivalents are forfeitable and are distributed to participants in cash consistent with the date the awards vest. Restricted Shares and RSUs Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2020 589,587 $ 22.96 Granted 341,508 22.61 Vested (229,226) 22.82 Forfeited (22,610) 22.77 Unvested at December 31, 2021 679,259 22.84 Granted (1) 322,316 25.85 Vested (256,779) 23.49 Forfeited (49,329) 23.91 Unvested at December 31, 2022 695,467 23.92 Granted (1) 378,453 28.45 Vested (272,678) 23.41 Forfeited (53,685) 26.21 Unvested at December 31, 2023 747,557 $ 26.24 (1) No restricted shares were granted during 2022 or 2023. The grant date fair value of restricted shares and RSUs is determined using the closing share price of the Company on the date of grant. Performance Shares and PSUs Performance shares and PSUs cliff-vest at the end of a performance period of three years with vesting based on attainment of threshold performance of earnings and return on capital targets. These awards are subject to continued employment through the vesting date or retirement eligibility, with payout ranging from 0% - 200% of the target number of shares for both PSUs and performance shares. Awards granted since 2021 include an additional rTSR component that allows for payout ranging from 0% - 250% of the target number of shares. Dividend equivalents equal to dividends paid on our common shares during the vesting period are tracked and accumulated for each award. The dividend equivalents are forfeitable consistent with the date the awards vest and are distributed to participants in cash at the same time as the underlying shares. Performance Shares and PSUs Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2020 655,022 $ 22.15 Granted 439,620 24.44 Vested — — Forfeited (313,362) 22.27 Unvested at December 31, 2021 781,280 23.39 Granted (1) 224,455 28.32 Vested (304,794) 22.04 Forfeited (97,942) 24.23 Unvested at December 31, 2022 602,999 25.77 Granted (1) 237,886 31.60 Vested (310,648) 24.43 Forfeited (129,682) 26.40 Unvested at December 31, 2023 400,555 $ 30.07 (1) No performance shares were granted during 2022 or 2023. We estimate the grant date fair value of performance shares and PSUs containing a rTSR component using a Monte Carlo simulation which requires assumptions for expected term, volatility, dividend yield, and risk-free interest rate. We use the historical volatility of peers to derive the expected volatility of the stock. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant taking into consideration the expected term of the awards. No expected dividend yield is used as the award agreement assumes dividends distributed during the performance period are reinvested. Assumptions used in the Monte Carlo simulation for awards granted in 2023, 2022, and 2021 were as follows: 2023 2022 2021 Weighted-average Monte Carlo value $ 31.60 $ 28.32 $ 24.44 Monte Carlo assumptions: Expected term 2.87 years 2.87 years 2.87 years Expected volatility 39.3 % 45.3 % 45.8 % Risk-free interest rate 4.3 1.8 0.2 Non-qualified Stock Options The options granted under the Plan have an exercise price equal to the fair market value of the underlying stock at the date of grant and vest ratably over a period of four years, with the first 25% of the grant becoming exercisable approximately one year after the date of grant. The options expire ten years from the date of grant. Non-qualified Stock Options Outstanding Number of Awards Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (1) (in thousands) Outstanding at December 31, 2020 685,900 $ 20.60 7.1 $ 735 Granted 305,668 22.63 Exercised (2) (42,904) 17.00 243 Forfeited — — Outstanding at December 31, 2021 948,664 21.42 7.3 5,208 Granted 311,501 25.58 Exercised (2) (150,692) 22.65 467 Forfeited (70,830) 22.92 Outstanding at December 31, 2022 1,038,643 22.39 7.6 1,794 Granted (3) — — Exercised (2) (6,000) 18.99 64 Forfeited (61,946) 23.71 Outstanding at December 31, 2023 970,697 $ 22.33 5.8 $ 3,140 Exercisable as of: December 31, 2021 329,711 $ 21.15 5.7 $ 1,898 December 31, 2022 402,945 20.89 6.4 1,098 December 31, 2023 630,171 21.48 4.9 2,531 (1) The aggregate intrinsic value was computed using the closing share price on December 29, 2023 of $25.45, December 30, 2022 of $23.40, and December 31, 2021 of $26.91, as applicable. (2) Cash received upon exercise of stock options was $0.1 million in 2023, $3.4 million in 2022, and $0.7 million in 2021. (3) No NQSOs were granted in 2023. Unvested Non-qualified Stock Options Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2020 506,007 $ 6.89 Granted 305,668 5.86 Vested (192,722) 7.01 Forfeited — — Unvested at December 31, 2021 618,953 6.34 Granted 311,501 7.32 Vested (223,926) 6.75 Forfeited (70,830) 6.55 Unvested at December 31, 2022 635,698 6.65 Granted (1) — — Vested (233,226) 6.59 Forfeited (61,946) 6.64 Unvested at December 31, 2023 340,526 $ 6.69 (1) No NQSOs were granted during 2023. We estimate the grant date fair value of option awards using the Black-Scholes option pricing model which uses assumptions over the expected term of the options. We use volatility analysis of comparable companies to determine the expected volatility of the stock and market data to estimate option exercise and employee termination within the valuation model. The expected term of options granted is based on the average of the contractual term and the weighted average of the vesting term, and it represents the average period of time that options granted are expected to be outstanding. The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. Assumptions used in calculating the Black-Scholes value of options granted during 2022 and 2021 were as follows: 2022 2021 Weighted-average Black-Scholes value $ 7.32 $ 5.86 Black-Scholes assumptions: Expected term 6.25 years 6.25 years Expected volatility 30.0 % 30.0 % Expected dividend yield 1.2 1.2 Risk-free interest rate 2.1 0.7 Director Share Awards and Deferred Stock Units Equity awards are granted to each director annually on the date of our annual shareholder meeting and accounted for as equity based in accordance with applicable accounting standards for these types of share-based payments. Expense related to our director equity based awards was $1.4 million in 2023, $1.4 million in 2022, and $1.3 million in 2021. We also grant equity retainer awards, or shares in lieu of cash, on a quarterly basis to our non-employee directors. These awards consist of fully vested shares of our Class B common stock or deferred stock units (DSUs). We account for the quarterly director share awards and DSUs as liability based in accordance with the applicable accounting standards for these types of share-based payments and remeasure the DSUs at the end of each reporting period through settlement. Expense related to our director liability based awards was $1.1 million in 2023, $0.9 million in 2022, and $1.2 million in 2021.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES In the ordinary course of conducting our business, we become involved in certain legal matters and investigations including liability claims, taxes other than income taxes, contract disputes, employment, and other litigation matters. We accrue for anticipated costs to resolve matters that are probable and estimable. We believe the outcomes of these matters will not have a material impact on our business or our consolidated financial statements. We record liabilities for claims against the Company based on our best estimate of expected losses. The primary claims arising for the Company through its trucking, intermodal, and logistics operations consist of accident-related claims for personal injury, collision, and comprehensive compensation, in addition to workers’ compensation, property damage, cargo, and wage and benefit claims. We maintain excess liability insurance with licensed insurance carriers for liability in excess of amounts we self-insure, which serves to largely offset the Company’s liability associated with these claims, with the exception of wage and benefit claims for which we self-insure. We review our accruals periodically to ensure that the aggregate amounts of our accruals are appropriate at any period after consideration of available insurance coverage. Although we expect that our claims accruals will continue to vary based on future developments, assuming that we are able to continue to obtain and maintain excess liability insurance coverage for such claims, we do not anticipate that such accruals will, in any period, materially impact our operating results. At December 31, 2023, our firm commitments to purchase transportation equipment totaled $236.7 million. During the first quarter of 2022, the Company recorded a $5.2 million charge as a result of an adverse audit assessment by a state jurisdiction over the applicability of sales tax for prior periods on rolling stock equipment used within that state. The Company filed a request for appeal of the audit assessment with the state jurisdiction, and during 2023, a ruling was made in favor of the state resulting in an additional $2.9 million in interest and penalties being recorded by the Company. A denial was received from the state during the fourth quarter of 2023 in response to the appeal, and as a result, the Company filed a petition request with the state Appellate Tax Board in January of 2024. Both the initial charge and the additional interest and penalties incurred are recorded within operating supplies and expenses—net on the consolidated statements of comprehensive income.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Segment Reporting	SEGMENT REPORTING We have three reportable segments – Truckload, Intermodal, and Logistics – which are based primarily on the services each segment provides. As of December 31, 2022, our three operating segments within the Truckload reportable segment were: VTL, Bulk, and MLS. As a result of expanding our dedicated business through recent acquisitions, in the fourth quarter of 2023, we reorganized the operating segments within Truckload into Dedicated, which includes MLS and M&M; Van Network; and Bulk. The three operating segments are aggregated because they have similar economic characteristics with our other Truckload operating segments and meet the other aggregation criteria described in ASC 280. Dedicated provides truckload services primarily focused on freight with consistent routes often based on long-term contracts, Van Network which consists of irregular routes, and Bulk which delivers key inputs for manufacturing processes, such as specialty chemicals using specialty trailers. The Intermodal reportable segment provides rail intermodal and drayage services to our customers. Company-owned containers, chassis, and dray tractors are used to provide these transportation services. The Company has two operating segments within the Logistics reportable segment, Brokerage and SCDM, which are aggregated because they have similar economic characteristics and meet the other aggregation criteria described in the accounting guidance for segment reporting. In the Logistics segment, we provide additional sources of truck capacity, manage transportation-systems analysis requirements for individual customers, and provide transloading and warehousing services. We generate other revenues from our leasing and captive insurance businesses which are operated by wholly owned subsidiaries. Through November of 2022 and prior to executing a management buyout agreement to sell that business, the Company had operations in Asia that met the definition of an operating segment. None of these operations meet the quantitative reporting thresholds, and a result, are grouped in “Other” in the tables below. Also included in “Other” are revenues and expenses that are incidental to our operations and not attributable to any of the reportable segments. The CODM reviews revenues for each segment without the inclusion of fuel surcharge revenue. For segment purposes, any fuel surcharge revenues earned are recorded as a reduction of the segment’s fuel expenses. Income from operations at the segment level reflects the measure presented to the CODM for each segment. Separate balance sheets are not prepared by segment, and as a result, assets are not separately identifiable by segment. All transactions between reportable segments are eliminated in consolidation. Substantially all of our revenues and assets were generated or located within the U.S. The following tables summarize our segment information. Inter-segment revenues within Other include revenues from insurance premiums charged to other segments for workers’ compensation, auto, and other types of insurance and were $77.5 million, $73.5 million, and $62.4 million for the years ended December 31, 2023, 2022, and 2021, respectively. Revenues by Segment Year Ended December 31, (in millions) 2023 2022 2021 Truckload $ 2,155.7 $ 2,236.6 $ 1,934.9 Intermodal 1,050.7 1,287.4 1,143.1 Logistics 1,393.7 1,956.2 1,808.7 Other 333.4 364.0 365.3 Fuel surcharge 684.3 862.5 444.8 Inter-segment eliminations (118.9) (102.3) (88.1) Operating revenues $ 5,498.9 $ 6,604.4 $ 5,608.7 Income (Loss) from Operations by Segment Year Ended December 31, (in millions) 2023 2022 2021 Truckload $ 170.7 $ 352.2 $ 284.7 Intermodal 71.0 165.1 155.2 Logistics 45.9 141.2 92.4 Other 8.8 (58.1) 1.4 Income from operations $ 296.4 $ 600.4 $ 533.7 Depreciation and Amortization by Segment Year Ended December 31, (in millions) 2023 2022 2021 Truckload $ 278.7 $ 249.3 $ 210.2 Intermodal 53.4 57.2 48.4 Logistics 0.1 0.1 0.2 Other 50.3 43.4 37.4 Depreciation and amortization $ 382.5 $ 350.0 $ 296.2

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	Schedule II - Valuation and Qualifying Accounts (in millions) Allowance for Doubtful Accounts and Revenue Adjustments for the Year Ended Balance at Beginning of Year Charged to Expense / Against Revenue Write-offs—Net of Recoveries Balance at December 31, 2021 $ 3.7 $ 2.3 $ (0.8) $ 5.2 December 31, 2022 5.2 10.6 (2.1) 13.7 December 31, 2023 13.7 7.9 (6.6) 15.0

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net income	$ 238.5	$ 457.8	$ 405.4

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Terminated	false

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations
Principles of Consolidation and Basis of Presentation	Principles of Consolidation and Basis of Presentation
Use of Estimates	Use of Estimates We make estimates and assumptions that affect assets, liabilities, the disclosure of contingent liabilities at the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from these estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash in excess of current operating requirements is invested in short-term, highly liquid investments. We consider all highly liquid investments purchased with original maturities of three months or less to be cash equivalents.
Receivables and Allowance	Receivables and Allowance Our trade accounts receivable is recorded net of an allowance for doubtful accounts and revenue adjustments. The allowance is based on an aging analysis using historical experience, as well as any current and forecasted trends or uncertainties related to customer billing and account collectability. The adequacy of our allowance is reviewed at least quarterly, and reserves for receivables not expected to be collected are established. In circumstances where we are aware of a customer’s inability to meet its financial obligations, a specific reserve is recorded to reduce the net receivable to the amount we reasonably expect to collect. Bad debt expense is included in other general expenses in the consolidated statements of comprehensive income.
Inventory	Inventory Our inventories consist of tractors and trailing equipment owned by our equipment leasing company to be sold or leased to owner-operators, as well as parts, tires, supplies, and fuel for use in our Company operations. These inventories are valued at the lower of cost or net realizable value using specific identification or average cost. The following table shows the components of our inventory balances as of the dates shown. (in millions) December 31, 2023 December 31, 2022 Tractors and trailing equipment for sale or lease $ 99.0 $ 35.8 Replacement parts 17.5 15.7 Tires and other 1.4 1.5 Total $ 117.9 $ 53.0
Investments in Marketable Securities	Investments in Marketable Securities Our marketable securities are classified as available-for-sale and carried at fair value in current assets on the consolidated balance sheets. While our intent is to hold our securities to maturity, sudden changes in the market or to our liquidity needs may cause us to sell certain securities in advance of their maturity date. Our marketable securities are accounted for under ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments . Under this guidance, credit losses are recorded through an allowance for credit losses rather than as a direct write-down to the security, and unrealized gains and losses, net of tax, are included as a component of accumulated other comprehensive income on the consolidated balance sheets, unless we determine that the amortized cost basis is not recoverable. If we determine that the amortized cost basis of the impaired security is not recoverable, we recognize the credit loss by increasing the allowance for those losses. We did not have an allowance for credit losses on our marketable securities as of December 31, 2023 and 2022. Cost basis is determined using the specific identification method.
Fair Value	Fair Value Fair value is the estimated price that would be received to sell an asset or paid to transfer a liability. Inputs to valuation techniques used to measure fair value fall into three broad levels (Levels 1, 2, and 3) as follows: Level 1 —Observable inputs that reflect quoted prices for identical assets or liabilities in active markets that we have the ability to access at the measurement date. Level 2 —Observable inputs, other than quoted prices included in Level 1, for the asset or liability or prices for similar assets and liabilities. Level 3 —Unobservable inputs reflecting the reporting entity’s estimates of the assumptions that market participants would use in pricing the asset or liability (including assumptions about risk). Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.
Property and Equipment	Property and Equipment Property and equipment are recorded at cost. Depreciation is calculated using the straight-line method based on the estimated useful lives and residual values. Generally, the estimated useful lives are as follows: 2023 Tractors 3 - 8 years Trailing equipment 6 - 20 years Other transportation equipment 4 - 5 years Buildings and improvements 5 - 25 years Other property 3 - 10 years Salvage values, when applicable, generally range from 0% - 30% or 0% - 25% of the original cost for tractors and trailing equipment, respectively, and reflect agreements with tractor suppliers for residual or trade-in values for certain new equipment. Long-lived assets require an impairment review when events or circumstances indicate that the carrying amount may not be recoverable. We base our evaluation of other long-lived assets on the presence of impairment indicators such as the future economic benefit of the assets, any historical or future profitability measurements, and other external market conditions or factors. The carrying amount of tangible long-lived assets held and used is considered not recoverable if the carrying amount exceeds the undiscounted sum of cash flows expected to result from the use and eventual disposition of the asset. If the carrying amount is not recoverable, the impairment loss is measured as the excess of the asset’s carrying amount over its fair value.
Assets Held for Sale	Assets Held for Sale Assets held for sale consist of transportation equipment and are included in prepaid expenses and other current assets in the consolidated balance sheets. Reclassification to assets held for sale occurs when the required criteria, as defined by ASC 360, Property, Plant and Equipment , are satisfied. Assets held for sale are evaluated for impairment when transferred to held for sale status or when impairment indicators are present. The carrying amount of assets held for sale is not recoverable if the carrying amount exceeds the fair value less estimated costs to sell the asset. An impairment loss is recorded for the excess of the asset’s carrying amount over its fair value less estimated costs to sell. Impairment losses are recorded in operating supplies and expenses—net in the consolidated statements of comprehensive income. We recorded no significant impairment losses for the years ended December 31, 2023, 2022, or 2021. Assets held for sale by segment as of December 31, 2023 and 2022 were as follows: (in millions) 2023 2022 Truckload $ 22.1 $ 21.0 Intermodal 6.7 0.8 Total $ 28.8 $ 21.8
Internal Use Software and Cloud Computing Arrangements	Internal Use Software and Cloud Computing Arrangements We capitalize certain costs incurred to acquire, develop, or modify software to meet the Company’s internal needs. Only costs incurred during the application development stage are capitalized once the preliminary project stage is complete and management has committed to funding the project. Internal use software costs are amortized on a straight-line basis primarily over five Under ASU 2018-15, we capitalize certain implementation costs for internal use software incurred in a CCA that is a service contract. CCA implementation costs are amortized on a straight-line basis over the term of the related hosting agreement, taking into consideration renewal options, if any. The renewal period is included in the amortization period if determined that the option is reasonably certain to be exercised. Amortization expense is recorded within operating supplies and expenses—net on the consolidated statements of comprehensive income, similar to the related hosting fees. We recorded $4.7 million, $1.3 million, and $1.0 million of amortization expense related to CCA implementation costs during the years ended December 31, 2023, 2022, and 2021, respectively. Capitalized computer costs are evaluated for impairment on an ongoing basis. If events or changes in circumstances (such as the manner in which the hosting arrangement is expected to be used) indicate that the carrying value may not be recoverable, the Company will evaluate the asset for impairment. If impairment is identified, it is recorded in operating supplies and expenses—net in the consolidated statements of comprehensive income. The following table provides information related to our internal use software and CCA implementation costs as of the dates shown. (in millions) December 31, 2023 December 31, 2022 Internal use software $ 325.6 $ 341.3 Less accumulated amortization 242.3 249.5 Net internal use software $ 83.3 $ 91.8 CCA implementation costs $ 35.9 $ 27.2 Less accumulated amortization 7.0 2.3 Net CCA implementation costs (1) $ 28.9 $ 24.9 (1) On the consolidated balance sheets, the current portion of CCA implementation costs are included within prepaid expenses and other current assets and amounted to $6.7 million and $1.3 million for the years ended December 31, 2023 and 2022, respectively, and the noncurrent portion is included in internal use software and other noncurrent assets and amounted to $22.2 million and $23.5 million for the years ended December 31, 2023 and 2022, respectively.
Goodwill	Goodwill Goodwill is tested for impairment annually in October, or more frequently if impairment indicators exist. The carrying amount of a reporting unit’s goodwill is considered not recoverable, and an impairment loss is recorded if the carrying amount of the reporting unit exceeds the reporting unit’s fair value, as determined based on the combination of income and market approaches. See Note 6, Goodwill and Other Intangible Assets , for more information on our goodwill.
Revenue Recognition	Revenue Recognition We recognize revenue during the delivery period based on relative transit time in each reporting period, in accordance with ASC 606, with expenses recognized as incurred. Accordingly, a portion of the total revenue that will be billed to the customer once a load is delivered is recognized in each reporting period based on the percentage of the freight delivery service that has been completed at the end of the reporting period. When we use third-party carriers, we generally record revenues on the gross basis at amounts charged to our customers because we are the primary obligor, we are a principal in the transaction, we invoice our customers and retain all credit risks, and we maintain discretion over pricing. Additionally, we are responsible for selection of third-party transportation providers to the extent they are used to satisfy customer freight requirements. We record revenues net of pass-through taxes in our consolidated statements of comprehensive income. For the years ended December 31, 2023, 2022, and 2021, no customer accounted for more than 10% of our consolidated revenues.
Income Taxes	Income Taxes Income taxes are accounted for under the liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as income or expense in the period that includes the enactment date. We record valuation allowances for deferred tax assets to the extent we do not believe these assets are more likely than not to be realized through the reversal of existing taxable temporary differences, projected future taxable income, or tax-planning strategies. We record a liability for unrecognized tax benefits when the benefits of tax positions taken on a tax return are not more likely than not to be sustained upon audit. Interest and penalties related to uncertain tax positions are classified as income tax expense in the consolidated statements of comprehensive income.
Earnings Per Share	Earnings Per Share We compute basic earnings per share by dividing net income available to common stockholders by the weighted average number of common shares outstanding for the reporting period. Diluted earnings per share reflects the potential dilution that could occur if holders of unvested restricted and performance share units or options were to exercise or convert their holdings into common stock. Awards that would have an anti-dilutive impact are excluded from the calculation.
Treasury Stock	Treasury Stock In 2023, the Company approved a stock repurchase program (the “Share Repurchase Program”) in which it periodically purchases its own common stock to offset the dilutive effects of equity grants to employees over time. The Inflation Reduction Act of 2022 subjects repurchases to a 1% nondeductible excise tax, which is included in the cost. The repurchased stock is classified as treasury stock on the consolidated balance sheets and is held at cost.
Share-based Compensation	Share-based Compensation We have share-based compensation plans covering certain employees, including officers and directors. We account for share-based compensation using the fair value recognition provisions of current accounting standards for share-based payments. These awards have historically consisted of restricted shares, RSUs, performance-based restricted shares, PSUs, and non-qualified stock options. We recognize compensation expense over the requisite service periods within each award. See Note 12, Share-Based Compensation , for more information about our plans.
Claim Accruals	Claims Accruals We are self-insured for loss of and damage to our owned and leased transportation equipment. We purchase insurance coverage for a portion of expenses related to employee injuries, vehicular accidents, and cargo damage. Certain insurance arrangements include a level of self-insurance (deductible) coverage applicable to each claim. We have excess policies to limit our exposure to catastrophic claim costs. The amounts of self-insurance change from time to time based on measurement dates, policy expiration dates, and claim type. Our claims accrual policy for all self-insured claims is to recognize a liability at the time of the incident based on our analysis of the nature and severity of the claims and analyses provided by third-party claims administrators, as well as legal, economic, and regulatory factors. The ultimate cost of a claim develops over time as additional information regarding the nature, timing, and extent of damages claimed becomes available. Accordingly, we use an actuarial method to develop current claim information to derive an estimate of our ultimate claim liability. This process involves the use of loss-development factors based on our historical claims experience and includes a contractual premium adjustment factor, if applicable. In doing so, the recorded liability considers future claims growth and provides an allowance for incurred but not reported claims. We do not discount our estimated losses. At December 31, 2023 and 2022, we had an accrual of $178.4 million and $164.9 million, respectively, for estimated claims net of reinsurance receivables. In addition, we are required to pay certain advanced deposits and monthly premiums. At December 31, 2023 and 2022, we had an aggregate prepaid insurance asset of $9.6 million and $9.2 million, respectively, which represented prefunded premiums and deposits.
Government Grants	Government Grants We have received grants from various California state organizations to be used towards the electrification of our fleet, inclusive of BEVs and charging stations. As there is no specific guidance under GAAP, we have elected to account for such grants under IAS 20, Accounting for Government Grants and Disclosure of Government Assistance , using the gross presentation model for the balance sheet and the net presentation model for the income statement. In accordance with IAS 20’s net presentation model, government grants can be offset against the related expenditures on the income statement when there is reasonable assurance that (1) the recipient will comply with the relevant conditions and (2) the grant will be received. During 2023, the Company placed assets in service that were purchased using grants from the EPA’s Targeted Airshed Grant (administered by the CARB) and the South Coast Air Quality Management District’s Joint Electric Truck Scaling Initiative. As of December 31, 2023, the Company believes the above conditions have been met, and for the year ended December 31, 2023, depreciation and amortization expense was reduced by $1.3 million in the consolidated statements of comprehensive income. As of December 31, 2023, the Company’s consolidated balance sheets included $2.1 million of grant receivables within other receivables and $2.4 million and $13.5 million in deferred grant income within other current liabilities and other noncurrent liabilities, respectively.
Sale of Business	Sale of Business On November 30, 2022, the Company entered into a management buyout agreement to sell 100% of its China-based logistics operations to certain members of Asia’s management team, ceasing Schneider’s Asia operations. The sale resulted in the recognition of a $5.0 million loss, which was recorded within operating supplies and expenses—net in the consolidated statements of comprehensive income, and operating results through the date of sale are included within Other. In conjunction with the management buyout agreement, a $4.1 million payment was made and is included within acquisitions and sale of business, net of cash acquired on the consolidated statements of cash flows.
Accounting Standards Recently Adopted	Accounting Standards Issued but Not Yet Adopted In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280) . This standard requires entities to disclose significant segment expenses that are regularly provided to the CODM, an amount and description of other segment items by reportable segment, all annual disclosures currently required under ASC 280 on an interim basis, if the CODM uses more than one measure of a segment’s profit or loss, at least one of the reported measures should be the measure most consistent with the measurement principle used in the consolidated financial statements, disclosure of title and position of CODM, as well as an explanation of how the CODM uses the reported measures in accessing performance and allocating resources, and a requirement for an entity with a single reportable segment to provide all of the disclosures required by this standard. This standard is effective for fiscal years beginning after December 15, 2023 with the interim requirement beginning within fiscal years beginning after December 15, 2024. We are currently evaluating the potential impacts of this update. In December 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosures . This standard requires additional income tax disclosures to enhance the transparency and decision usefulness of income tax disclosures. ASU 2023-09 requires entities to disclose information on revised quantitative thresholds and to disaggregate taxes by federal, state, and local jurisdictions. This is effective for annual periods beginning after December 15, 2024, with early adoption permitted. We are currently evaluating the potential impacts of this update.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Inventory Balances	The following table shows the components of our inventory balances as of the dates shown. (in millions) December 31, 2023 December 31, 2022 Tractors and trailing equipment for sale or lease $ 99.0 $ 35.8 Replacement parts 17.5 15.7 Tires and other 1.4 1.5 Total $ 117.9 $ 53.0
Property and Equipment	Generally, the estimated useful lives are as follows: 2023 Tractors 3 - 8 years Trailing equipment 6 - 20 years Other transportation equipment 4 - 5 years Buildings and improvements 5 - 25 years Other property 3 - 10 years
Assets Held for Sale	Assets held for sale by segment as of December 31, 2023 and 2022 were as follows: (in millions) 2023 2022 Truckload $ 22.1 $ 21.0 Intermodal 6.7 0.8 Total $ 28.8 $ 21.8
Internal Use Software and Cloud Computing Arrangement Implementation Costs	The following table provides information related to our internal use software and CCA implementation costs as of the dates shown. (in millions) December 31, 2023 December 31, 2022 Internal use software $ 325.6 $ 341.3 Less accumulated amortization 242.3 249.5 Net internal use software $ 83.3 $ 91.8 CCA implementation costs $ 35.9 $ 27.2 Less accumulated amortization 7.0 2.3 Net CCA implementation costs (1) $ 28.9 $ 24.9 (1) On the consolidated balance sheets, the current portion of CCA implementation costs are included within prepaid expenses and other current assets and amounted to $6.7 million and $1.3 million for the years ended December 31, 2023 and 2022, respectively, and the noncurrent portion is included in internal use software and other noncurrent assets and amounted to $22.2 million and $23.5 million for the years ended December 31, 2023 and 2022, respectively.

Business Combinations and Ass_2

Business Combinations and Asset Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The preliminary purchase price allocation for M&M, which may be adjusted as we finalize our fair value estimates and provisional amounts, was as follows: Recognized amounts of identifiable assets acquired and liabilities assumed (in millions) August 1, 2023 Adjustments Adjusted Cash and cash equivalents $ 3.6 $ — $ 3.6 Trade accounts receivable—net of allowance 15.1 — 15.1 Prepaid expenses and other current assets 3.0 — 3.0 Net property and equipment 77.8 — 77.8 Internal use software and other noncurrent assets 56.9 0.5 57.4 Goodwill 104.6 (1.1) 103.5 Total assets acquired 261.0 (0.6) 260.4 Trade accounts payable 1.4 — 1.4 Accrued salaries, wages, and benefits 5.3 — 5.3 Claims accruals—current 1.8 — 1.8 Other current liabilities 4.2 (1.3) 2.9 Other noncurrent liabilities 5.2 — 5.2 Total liabilities assumed 17.9 (1.3) 16.6 Net assets acquired $ 243.1 $ 0.7 $ 243.8 The following table summarizes the purchase price allocation for MLS, including any adjustments during the measurement period. Recognized amounts of identifiable assets acquired and liabilities assumed (in millions) December 31, 2021 Adjustments Adjusted December 31, 2021 Opening Balance Sheet Cash and cash equivalents $ — $ 1.8 $ 1.8 Trade accounts receivable—net of allowance 18.6 (6.7) 11.9 Other receivables 0.9 1.5 2.4 Prepaid expenses and other current assets 1.6 — 1.6 Net property and equipment 148.9 (0.8) 148.1 Internal use software and other noncurrent assets — 11.7 11.7 Goodwill 122.7 (18.4) 104.3 Total assets acquired 292.7 (10.9) 281.8 Trade accounts payable 1.8 1.6 3.4 Accrued salaries, wages, and benefits 1.7 0.9 2.6 Claims accruals—current 7.5 (3.0) 4.5 Other current liabilities 7.2 (3.9) 3.3 Deferred income taxes — (1.1) (1.1) Other noncurrent liabilities — 0.3 0.3 Total liabilities assumed 18.2 (5.2) 13.0 Net assets acquired $ 274.5 $ (5.7) $ 268.8

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Disaggregated Revenues	The following table summarizes our revenues by type of service, which are explained in greater detail below. Year Ended December 31, Disaggregated Revenues ( in millions ) 2023 2022 2021 Transportation $ 5,102.0 $ 6,119.9 $ 5,166.7 Logistics Management 190.1 274.2 219.0 Other 206.8 210.3 223.0 Total operating revenues $ 5,498.9 $ 6,604.4 $ 5,608.7
Remaining Performance Obligations	The following table provides information related to transactions and expected timing of revenue recognition for performance obligations that are fixed in nature and relate to contracts with terms greater than one year as of the date shown. Remaining Performance Obligations (in millions) December 31, 2023 Expected to be recognized within one year Transportation $ 27.2 Logistics Management 17.3 Expected to be recognized after one year Transportation 36.6 Logistics Management 14.7 Total $ 95.8
Contract Balances	The following table provides information related to contract balances associated with our contracts with customers as of the dates shown. Contract Balances ( in millions ) December 31, 2023 December 31, 2022 December 31, 2021 Other current assets—Contract assets $ 23.7 $ 27.0 $ 33.8 Other current liabilities—Contract liabilities — 2.6 3.2

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring	The table below sets forth the Company’s financial assets that are measured at fair value on a recurring, monthly basis in accordance with ASC 820. Fair Value at (in millions) Level in Fair December 31, 2023 December 31, 2022 Equity investment in TuSimple (1) 1 $ 0.3 $ 0.6 Marketable securities (2) 2 57.2 45.9 (1) Our equity investment in TuSimple is classified as Level 1 in the fair value hierarchy as shares of TuSimple’s Class A common stock are traded on the NASDAQ. See Note 5, Investments, for additional information . (2) Marketable securities are classified as Level 2 in the fair value hierarchy as they are valued based on quoted prices for similar assets in active markets or quoted prices for identical or similar assets in markets that are not active. See Note 5, Investments , for additional information.
Fair Value Measurements, Nonrecurring	We measure non-financial assets, such as assets held for sale and other long-lived assets, at fair value when there is an indicator of impairment and only when we recognize an impairment loss. The table below sets forth the Company’s non-financial assets that were measured at fair value on a non-recurring basis during 2023. (in millions) Level in Fair Fair Value at December 31, 2023 Assets held for sale (1) 2 $ 6.4 (1) Our held for sale transportation equipment is evaluated for impairment using market data upon classification as held for sale or as impairment indicators are present. If the carrying value of the assets held for sale exceeds the fair value, an impairment is recorded. All of the assets held for sale at December 31, 2023 were recorded at fair value. Refer to Note 1, Summary of Significant Accounting Policies, for further details on impairment charges.

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Schedule of Marketable Securities	The following table presents the maturities and values of our marketable securities as of the dates shown. December 31, 2023 December 31, 2022 (in millions, except maturities in months) Maturities Amortized Cost Fair Value Amortized Cost Fair Value U.S. treasury and government agencies 8 to 86 $ 24.9 $ 22.9 $ 21.9 $ 19.3 Corporate debt securities 4 to 112 20.0 19.2 16.0 14.9 State and municipal bonds 6 to 178 15.5 15.1 12.4 11.7 Total marketable securities $ 60.4 $ 57.2 $ 50.3 $ 45.9
Equity Investments without Readily Determinable Fair Values	The following table summarizes the activity related to these equity investments during the periods presented. Year Ended December 31, (in millions) 2023 2022 2021 Investment in equity securities $ 15.8 $ 24.0 $ — Upward adjustments (1) 20.0 25.8 13.9 Cumulative upward adjustments 72.0 (1) Our updated investment values were determined using the backsolve method, a valuation approach that primarily uses an option pricing model to value shares based on the price paid for recently issued shares.

Goodwill and Other Intangibles

Goodwill and Other Intangibles (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Carrying Amount of Goodwill	The following table shows changes to our goodwill balances by segment during the years ended December 31, 2023 and 2022. (in millions) Truckload Logistics Total Balance at December 31, 2021 $ 226.3 $ 14.2 $ 240.5 Acquisition (see Note 2) 7.7 — 7.7 Acquisition adjustments (see Note 2) (20.0) — (20.0) Balance at December 31, 2022 214.0 14.2 228.2 Acquisition (see Note 2) 104.6 — 104.6 Acquisition adjustments (see Note 2) (1.1) — (1.1) Balance at December 31, 2023 $ 317.5 $ 14.2 $ 331.7
Schedule of Changes in Carrying Amount of Intangibles	The identifiable finite lived intangible assets other than goodwill listed below are included in internal use software and other noncurrent assets on the consolidated balance sheets. December 31, 2023 December 31, 2022 (in millions) Gross Accumulated Amortization Net Gross Accumulated Amortization Net Customer relationships $ 43.5 $ 1.8 $ 41.7 $ 3.2 $ 0.3 $ 2.9 Trademarks 10.9 1.5 9.4 6.8 0.7 6.1 Non-compete agreements 5.4 0.4 5.0 — — — Total intangible assets $ 59.8 $ 3.7 $ 56.1 $ 10.0 $ 1.0 $ 9.0
Schedule of Future Amortization Expense	Estimated future amortization expense related to intangible assets is as follows: (in millions) December 31, 2023 2024 $ 5.0 2025 5.0 2026 5.0 2027 5.0 2028 4.6 2029 and thereafter 31.5 Total $ 56.1

Debt and Credit Facilities (Tab

Debt and Credit Facilities (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Summary of Debt	As of December 31, 2023 and 2022, debt included the following: (in millions) December 31, 2023 December 31, 2022 Unsecured senior notes: principal payable at maturities ranging from 2024 through 2028; interest payable in semiannual installments through the same timeframe; weighted-average interest rate of 3.68% and 3.93% for 2023 and 2022, respectively $ 185.0 $ 205.0 Credit agreement: matures November 2027; variable rate interest payments due monthly based on the Term SOFR; weighted-average interest rate of 6.43% for 2023. 45.0 — Receivables purchase agreement: matures July 2024; variable rate interest payments due monthly based on the Term SOFR; weighted-average interest rate of 6.28% for 2023. 60.0 — Total debt and credit facilities 290.0 205.0 Current maturities (100.0) (70.0) Long-term debt and credit facilities $ 190.0 $ 135.0
Schedule of Debt Maturities	Scheduled future debt principal payments are as follows: (in millions) December 31, 2023 2024 $ 100.0 2025 95.0 2026 — 2027 45.0 2028 50.0 Total $ 290.0

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Schedule of Net Lease Costs and Other Lease Information	The following table presents our net lease costs for the years ended December 31, 2023, 2022, and 2021. Financial Statement Classification Year Ended December 31, (in millions) 2023 2022 2021 Operating lease cost Operating lease cost Operating supplies and expenses—net $ 36.7 $ 32.9 $ 31.3 Short-term lease cost (1) Operating supplies and expenses—net 7.7 6.3 3.0 Finance lease cost Amortization of right-of-use assets Depreciation and amortization 3.9 2.2 0.8 Interest on lease liabilities Interest expense 0.5 0.2 0.1 Variable lease cost Operating supplies and expenses—net 2.7 2.9 0.9 Sublease income Operating supplies and expenses—net (2.3) (3.0) (4.5) Total net lease cost $ 49.2 $ 41.5 $ 31.6 (1) Includes short-term lease costs for leases twelve months or less, including those with a duration of one month or less. As of December 31, 2023 and 2022, remaining lease terms and discount rates under operating and finance leases were as follows: December 31, 2023 December 31, 2022 Weighted-average remaining lease term Operating leases 3.8 years 3.2 years Finance leases 3.2 years 3.2 years Weighted-average discount rate (1) Operating leases 5.0 % 3.7 % Finance leases 5.0 % 4.3 % (1) Determined based on a portfolio approach. Additional information related to our leases is as follows: Year Ended December 31, (in millions) 2023 2022 2021 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for operating leases $ 36.7 $ 33.3 $ 31.4 Operating cash flows for finance leases 0.5 0.2 0.1 Financing cash flows for finance leases 3.9 2.0 0.8 Right-of-use assets obtained in exchange for new lease liabilities Operating leases $ 52.6 $ 23.7 $ 28.7 Finance leases 5.8 6.8 4.1
Schedule of Future Minimum Lease Payments for Operating Leases	At December 31, 2023, future lease payments under operating and finance leases were as follows: (in millions) Operating Leases Finance Leases 2024 $ 33.8 $ 4.9 2025 25.0 3.9 2026 15.5 2.3 2027 8.6 1.2 2028 6.7 0.7 2029 and thereafter 7.3 — Total 96.9 13.0 Amount representing interest (8.9) (0.9) Present value of lease payments 88.0 12.1 Current maturities (30.4) (4.5) Long-term lease obligations $ 57.6 $ 7.6
Schedule of Future Minimum Lease Payments for Finance Leases	At December 31, 2023, future lease payments under operating and finance leases were as follows: (in millions) Operating Leases Finance Leases 2024 $ 33.8 $ 4.9 2025 25.0 3.9 2026 15.5 2.3 2027 8.6 1.2 2028 6.7 0.7 2029 and thereafter 7.3 — Total 96.9 13.0 Amount representing interest (8.9) (0.9) Present value of lease payments 88.0 12.1 Current maturities (30.4) (4.5) Long-term lease obligations $ 57.6 $ 7.6
Schedule of Finance Leased Right-of-Use Assets	The consolidated balance sheets include right-of-use assets acquired under finance leases as components of property and equipment as of December 31, 2023 and 2022. Real and other property under finance leases are being amortized to a zero net book value over the initial lease term. (in millions) December 31, 2023 December 31, 2022 Transportation equipment $ 7.9 $ 3.1 Real property 1.1 1.0 Other property 10.4 8.9 Accumulated amortization (7.7) (3.3) Total $ 11.7 $ 9.7
Schedule of Investment in Lease Receivables	As of December 31, 2023 and 2022, investments in lease receivables were as follows: (in millions) December 31, 2023 December 31, 2022 Future minimum payments to be received on leases $ 161.8 $ 198.4 Guaranteed residual lease values 103.9 126.1 Total minimum lease payments to be received 265.7 324.5 Unearned income (42.2) (50.2) Net investment in leases $ 223.5 $ 274.3
Schedule of Principal Amounts to be Received on Lease Receivables	The amounts to be received on lease receivables as of December 31, 2023 were as follows: (in millions) December 31, 2023 2024 $ 118.2 2025 86.8 2026 60.2 2027 0.5 Total undiscounted lease cash flows 265.7 Amount representing interest (42.2) Present value of lease receivables 223.5 Current lease receivables—net of allowance (93.3) Long-term lease receivable $ 130.2
Schedule of Sales-type Lease Income	The table below provides additional information on our sales-type leases. Revenue and cost of goods sold are recorded in operating revenues and operating supplies and expenses—net in the consolidated statements of comprehensive income, respectively. Year Ended December 31, (in millions) 2023 2022 2021 Revenue $ 206.1 $ 195.0 $ 206.1 Cost of goods sold (174.9) (161.8) (177.6) Operating profit $ 31.2 $ 33.2 $ 28.5 Interest income on lease receivable $ 36.1 $ 37.0 $ 32.4

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Components of the Provision for Income Taxes	The components of the provision for income taxes for the years ended December 31, 2023, 2022, and 2021 were as follows: (in millions) 2023 2022 2021 Current: Federal $ 15.2 $ 28.1 $ 112.5 Foreign (10.1) 15.8 — State 6.7 19.3 22.1 11.8 63.2 134.6 Deferred: Federal 47.7 82.8 0.8 State and other 8.1 0.2 1.2 55.8 83.0 2.0 Total provision for income taxes $ 67.6 $ 146.2 $ 136.6
Schedule of Effective Income Tax Rate Reconciliation	The provision for income taxes for the years ended December 31, 2023, 2022, and 2021 differed from the amounts computed using the federal statutory rate in effect as follows: 2023 2022 2021 (in millions, except percentages) Dollar Impact Rate Dollar Impact Rate Dollar Impact Rate Income tax at federal statutory rate $ 64.3 21.0 % $ 126.8 21.0 % $ 113.8 21.0 % State tax—net of federal effect 13.8 4.5 15.4 2.6 18.9 3.5 Change in valuation allowance (10.7) (3.5) 10.7 1.8 — — Other—net 0.2 0.1 (6.7) (1.2) 3.9 0.7 Total provision for income taxes $ 67.6 22.1 % $ 146.2 24.2 % $ 136.6 25.2 %
Schedule of Deferred Tax Assets and Liabilities	The components of the net deferred tax liability included in deferred income taxes in the consolidated balance sheets as of December 31, 2023 and 2022 were as follows: (in millions) 2023 2022 Deferred tax assets: Compensation and employee benefits $ 8.1 $ 7.8 Operating lease liabilities 21.4 16.4 State net operating losses and credit carryforwards 10.5 9.4 Foreign capital loss carryforward — 10.7 Other 14.2 14.9 Total gross deferred tax assets 54.2 59.2 Valuation allowance (0.9) (12.8) Total deferred tax assets—net of valuation allowance 53.3 46.4 Deferred tax liabilities: Property and equipment 596.3 548.0 Prepaid expenses 6.8 5.6 Intangible assets 8.1 2.4 Operating lease right-of-use assets 19.6 15.2 Other 18.2 13.4 Total gross deferred tax liabilities 649.0 584.6 Net deferred tax liability $ 595.7 $ 538.2
Schedule of Unrecognized Tax Benefits	As of December 31, 2023, 2022, and 2021, a reconciliation of the beginning and ending unrecognized tax benefits, which is recorded as other noncurrent liabilities in the consolidated balance sheets, is as follows: (in millions) 2023 2022 2021 Gross unrecognized tax benefits—beginning of year $ 6.0 $ 5.2 $ 4.3 Gross increases—tax positions related to current year — 1.0 0.9 Gross decreases—tax positions taken in prior years (0.5) (0.2) — Settlements (1.1) — — Gross unrecognized tax benefits—end of year $ 4.4 $ 6.0 $ 5.2

Common Equity (Tables)

Common Equity (Tables)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Calculation of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share for the years ended December 31, 2023, 2022, and 2021. Year Ended December 31, (in millions, except per share data) 2023 2022 2021 Numerator: Net income available to common shareholders $ 238.5 $ 457.8 $ 405.4 Denominator: Weighted average common shares outstanding 177.3 177.9 177.6 Dilutive effect of share-based awards and options outstanding 0.8 0.9 0.5 Weighted average diluted common shares outstanding (1) 178.2 178.8 178.1 Basic earnings per common share $ 1.35 $ 2.57 $ 2.28 Diluted earnings per common share 1.34 2.56 2.28 (1) Weighted average diluted common shares outstanding may not sum due to rounding.
Schedule of Common Stock Outstanding Roll Forward	The following table shows changes to our Class B common shares outstanding for the years ended December 31, 2023, 2022, and 2021. Year Ended December 31, 2023 2022 2021 Outstanding at beginning of period 94,993,144 94,626,740 94,311,653 Repurchases of common stock (2,505,267) — — Share issuances 681,642 306,071 370,226 Exercise of employee stock options 6,000 150,692 42,904 Shares withheld for employee taxes (244,277) (90,359) (98,043) Outstanding at end of period 92,931,242 94,993,144 94,626,740

Share-based Compensation (Table

Share-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Components of Share-Based Compensation Program Expense	The following table summarizes the components of our employee share-based compensation expense. Year Ended December 31, (in millions) 2023 2022 2021 Restricted shares and RSUs $ 9.7 $ 5.7 $ 5.8 Performance shares and PSUs 3.9 8.7 6.1 Non-qualified stock options 2.0 1.4 1.4 Share-based compensation expense $ 15.6 $ 15.8 $ 13.3 Related tax benefit $ 3.5 $ 3.8 $ 3.3
Schedule of Restricted Shares and RSU's Activity	Under the Plan, RSUs granted in 2023 vest ratably over a period of three years while the majority of the restricted shares and RSUs granted prior to 2023 vest ratably over a period of four years beginning approximately one year after the date of grant and are subject to continued employment through the vesting date or retirement eligibility. Dividend equivalents, equal to dividends paid on our common shares during the vesting period, are tracked and accumulated for each restricted share and RSU. The dividend equivalents are forfeitable and are distributed to participants in cash consistent with the date the awards vest. Restricted Shares and RSUs Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2020 589,587 $ 22.96 Granted 341,508 22.61 Vested (229,226) 22.82 Forfeited (22,610) 22.77 Unvested at December 31, 2021 679,259 22.84 Granted (1) 322,316 25.85 Vested (256,779) 23.49 Forfeited (49,329) 23.91 Unvested at December 31, 2022 695,467 23.92 Granted (1) 378,453 28.45 Vested (272,678) 23.41 Forfeited (53,685) 26.21 Unvested at December 31, 2023 747,557 $ 26.24 (1) No restricted shares were granted during 2022 or 2023.
Schedule of Performance Shares and PSU's Activity	Performance shares and PSUs cliff-vest at the end of a performance period of three years with vesting based on attainment of threshold performance of earnings and return on capital targets. These awards are subject to continued employment through the vesting date or retirement eligibility, with payout ranging from 0% - 200% of the target number of shares for both PSUs and performance shares. Awards granted since 2021 include an additional rTSR component that allows for payout ranging from 0% - 250% of the target number of shares. Dividend equivalents equal to dividends paid on our common shares during the vesting period are tracked and accumulated for each award. The dividend equivalents are forfeitable consistent with the date the awards vest and are distributed to participants in cash at the same time as the underlying shares. Performance Shares and PSUs Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2020 655,022 $ 22.15 Granted 439,620 24.44 Vested — — Forfeited (313,362) 22.27 Unvested at December 31, 2021 781,280 23.39 Granted (1) 224,455 28.32 Vested (304,794) 22.04 Forfeited (97,942) 24.23 Unvested at December 31, 2022 602,999 25.77 Granted (1) 237,886 31.60 Vested (310,648) 24.43 Forfeited (129,682) 26.40 Unvested at December 31, 2023 400,555 $ 30.07 (1) No performance shares were granted during 2022 or 2023.
Schedule of Assumptions Used in Calculating Value of Performance Shares and PSU's	Assumptions used in the Monte Carlo simulation for awards granted in 2023, 2022, and 2021 were as follows: 2023 2022 2021 Weighted-average Monte Carlo value $ 31.60 $ 28.32 $ 24.44 Monte Carlo assumptions: Expected term 2.87 years 2.87 years 2.87 years Expected volatility 39.3 % 45.3 % 45.8 % Risk-free interest rate 4.3 1.8 0.2
Schedule of Nonqualified Stock Options Activity	The options granted under the Plan have an exercise price equal to the fair market value of the underlying stock at the date of grant and vest ratably over a period of four years, with the first 25% of the grant becoming exercisable approximately one year after the date of grant. The options expire ten years from the date of grant. Non-qualified Stock Options Outstanding Number of Awards Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (1) (in thousands) Outstanding at December 31, 2020 685,900 $ 20.60 7.1 $ 735 Granted 305,668 22.63 Exercised (2) (42,904) 17.00 243 Forfeited — — Outstanding at December 31, 2021 948,664 21.42 7.3 5,208 Granted 311,501 25.58 Exercised (2) (150,692) 22.65 467 Forfeited (70,830) 22.92 Outstanding at December 31, 2022 1,038,643 22.39 7.6 1,794 Granted (3) — — Exercised (2) (6,000) 18.99 64 Forfeited (61,946) 23.71 Outstanding at December 31, 2023 970,697 $ 22.33 5.8 $ 3,140 Exercisable as of: December 31, 2021 329,711 $ 21.15 5.7 $ 1,898 December 31, 2022 402,945 20.89 6.4 1,098 December 31, 2023 630,171 21.48 4.9 2,531 (1) The aggregate intrinsic value was computed using the closing share price on December 29, 2023 of $25.45, December 30, 2022 of $23.40, and December 31, 2021 of $26.91, as applicable. (2) Cash received upon exercise of stock options was $0.1 million in 2023, $3.4 million in 2022, and $0.7 million in 2021. (3) No NQSOs were granted in 2023. Unvested Non-qualified Stock Options Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2020 506,007 $ 6.89 Granted 305,668 5.86 Vested (192,722) 7.01 Forfeited — — Unvested at December 31, 2021 618,953 6.34 Granted 311,501 7.32 Vested (223,926) 6.75 Forfeited (70,830) 6.55 Unvested at December 31, 2022 635,698 6.65 Granted (1) — — Vested (233,226) 6.59 Forfeited (61,946) 6.64 Unvested at December 31, 2023 340,526 $ 6.69 (1) No NQSOs were granted during 2023.
Schedule of Assumptions Used in Calculating Value of Stock Options	Assumptions used in calculating the Black-Scholes value of options granted during 2022 and 2021 were as follows: 2022 2021 Weighted-average Black-Scholes value $ 7.32 $ 5.86 Black-Scholes assumptions: Expected term 6.25 years 6.25 years Expected volatility 30.0 % 30.0 % Expected dividend yield 1.2 1.2 Risk-free interest rate 2.1 0.7

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Summary of Segment Reporting Information	The following tables summarize our segment information. Inter-segment revenues within Other include revenues from insurance premiums charged to other segments for workers’ compensation, auto, and other types of insurance and were $77.5 million, $73.5 million, and $62.4 million for the years ended December 31, 2023, 2022, and 2021, respectively. Revenues by Segment Year Ended December 31, (in millions) 2023 2022 2021 Truckload $ 2,155.7 $ 2,236.6 $ 1,934.9 Intermodal 1,050.7 1,287.4 1,143.1 Logistics 1,393.7 1,956.2 1,808.7 Other 333.4 364.0 365.3 Fuel surcharge 684.3 862.5 444.8 Inter-segment eliminations (118.9) (102.3) (88.1) Operating revenues $ 5,498.9 $ 6,604.4 $ 5,608.7 Income (Loss) from Operations by Segment Year Ended December 31, (in millions) 2023 2022 2021 Truckload $ 170.7 $ 352.2 $ 284.7 Intermodal 71.0 165.1 155.2 Logistics 45.9 141.2 92.4 Other 8.8 (58.1) 1.4 Income from operations $ 296.4 $ 600.4 $ 533.7 Depreciation and Amortization by Segment Year Ended December 31, (in millions) 2023 2022 2021 Truckload $ 278.7 $ 249.3 $ 210.2 Intermodal 53.4 57.2 48.4 Logistics 0.1 0.1 0.2 Other 50.3 43.4 37.4 Depreciation and amortization $ 382.5 $ 350.0 $ 296.2

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Credit loss allowance on marketable securities	$ 0	$ 0
Accrued claims, net of reinsurance receivables	178.4	164.9
Prepaid insurance	9.6	9.2
Government assistance amount (offset to depreciation)	1.3
Government grants receivable	2.1
Deferred grant income, current	2.4
Deferred grant income, noncurrent	13.5
Loss on sale of business	$ 0	5	$ 0
Payment for sale of business		$ 4.1

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Inventory Balances (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Inventory
Inventory	$ 117.9	$ 53
Tractors and trailing equipment for sale or lease
Inventory
Inventory	99	35.8
Replacement parts
Inventory
Inventory	17.5	15.7
Tires and other
Inventory
Inventory	$ 1.4	$ 1.5

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment
Gain or (loss) on sales of property and equipment—net	$ 28.7	$ 85.7	$ 63.9
Tractors | Minimum
Property, Plant and Equipment
Useful life	3 years
Salvage value percentage	0%
Tractors | Maximum
Property, Plant and Equipment
Useful life	8 years
Salvage value percentage	30%
Trailing equipment | Minimum
Property, Plant and Equipment
Useful life	6 years
Salvage value percentage	0%
Trailing equipment | Maximum
Property, Plant and Equipment
Useful life	20 years
Salvage value percentage	25%
Other transportation equipment | Minimum
Property, Plant and Equipment
Useful life	4 years
Other transportation equipment | Maximum
Property, Plant and Equipment
Useful life	5 years
Buildings and improvements | Minimum
Property, Plant and Equipment
Useful life	5 years
Buildings and improvements | Maximum
Property, Plant and Equipment
Useful life	25 years
Other property | Minimum
Property, Plant and Equipment
Useful life	3 years
Other property | Maximum
Property, Plant and Equipment
Useful life	10 years

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Assets Held for Sale (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Long Lived Assets Held-for-sale
Assets held for sale	$ 28.8	$ 21.8
Truckload
Long Lived Assets Held-for-sale
Assets held for sale	22.1	21
Intermodal
Long Lived Assets Held-for-sale
Assets held for sale	$ 6.7	$ 0.8

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Internal Use Software and Cloud Computing Arrangements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Internal use software useful life	5 years
Internal use software amortization expense	$ 25.2	$ 24.5	$ 20.2
Cloud computing arrangement implementation amortization expense	4.7	1.3	$ 1
Internal Use Software and Cloud Computing Arrangements
Internal use software, gross	325.6	341.3
Internal use software, accumulated amortization	242.3	249.5
Internal use software, net	83.3	91.8
Cloud computing arrangement implementation costs, gross	35.9	27.2
Cloud computing arrangement implementation costs, accumulated amortization	7	2.3
Cloud computing arrangement implementation costs, net	28.9	24.9
Internal use software and other noncurrent assets
Internal Use Software and Cloud Computing Arrangements
Cloud computing arrangement implementation costs, net	22.2	23.5
Prepaid Expenses and other current assets
Internal Use Software and Cloud Computing Arrangements
Cloud computing arrangement implementation costs, net	$ 6.7	$ 1.3

Business Combinations and Ass_3

Business Combinations and Asset Acquisitions- Acquisition Details (Details)	Aug. 01, 2023	Jun. 07, 2022	Dec. 31, 2021
M&M Transport Services, LLC (M&M)
Business Acquisition
Date of acquisition	Aug. 01, 2023
Percentage of business acquired	100%
deBoer Transportation, Inc.
Business Acquisition
Date of acquisition		Jun. 07, 2022
Percentage of business acquired		100%
Midwest Logistics Systems (MLS)
Business Acquisition
Date of acquisition			Dec. 31, 2021
Percentage of business acquired			100%

Business Combinations and Ass_4

Business Combinations and Asset Acquisitions- Consideration Transferred (Details) - USD ($) $ in Millions	Aug. 01, 2023	Jun. 07, 2022	Dec. 31, 2021
M&M Transport Services, LLC (M&M)
Business Acquisition
Fair value of consideration transferred	$ 243.8
deBoer Transportation, Inc.
Business Acquisition
Fair value of consideration transferred		$ 34.6
Midwest Logistics Systems (MLS)
Business Acquisition
Fair value of consideration transferred			$ 268.8
Midwest Logistics Systems (MLS) | Consideration for Debt Payments
Business Acquisition
Fair value of consideration transferred			26.9
Midwest Logistics Systems (MLS) | Deferred cash consideration
Business Acquisition
Fair value of consideration transferred			3.2
Midwest Logistics Systems (MLS) | Net working capital adjustment
Business Acquisition
Fair value of consideration transferred			$ (5.7)

Business Combinations and Ass_5

Business Combinations and Asset Acquisitions- Acquisition-Related Costs (Details) - USD ($) $ in Millions	Aug. 01, 2023	Jun. 07, 2022	Dec. 31, 2021
M&M Transport Services, LLC (M&M)
Business Acquisition
Acquisition-related costs	$ 0.9
deBoer Transportation, Inc.
Business Acquisition
Acquisition-related costs		$ 0.3
Midwest Logistics Systems (MLS)
Business Acquisition
Acquisition-related costs			$ 1.9

Business Combinations and Ass_6

Business Combinations and Asset Acquisitions- Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Aug. 01, 2023	Dec. 31, 2021
Business Acquisition
Goodwill acquired during period	$ 104.6	$ 7.7
Goodwill	331.7	228.2		$ 240.5
Truckload
Business Acquisition
Goodwill	317.5	214		226.3
M&M Transport Services, LLC (M&M)
Business Acquisition
Cash and cash equivalents	3.6		$ 3.6
Trade accounts receivable—net of allowance	15.1		15.1
Prepaid expenses and other current assets	3		3
Net property and equipment	77.8		77.8
Internal use software and other noncurrent assets	57.4		56.9
Goodwill	103.5		104.6
Total assets acquired	260.4		261
Trade accounts payable	1.4		1.4
Accrued salaries, wages, and benefits	5.3		5.3
Claims liabilities—current	1.8		1.8
Other current liabilities	2.9		4.2
Other noncurrent liabilities	5.2		5.2
Total liabilities assumed	16.6		17.9
Net assets acquired	243.8		$ 243.1
M&M Transport Services, LLC (M&M) | Truckload
Business Acquisition
Goodwill acquired during period	104.6
M&M Transport Services, LLC (M&M) | Restatement Adjustment
Business Acquisition
Cash and cash equivalents	0
Trade accounts receivable—net of allowance	0
Prepaid expenses and other current assets	0
Net property and equipment	0
Internal use software and other noncurrent assets	0.5
Goodwill	(1.1)
Total assets acquired	(0.6)
Trade accounts payable	0
Accrued salaries, wages, and benefits	0
Claims liabilities—current	0
Other current liabilities	(1.3)
Other noncurrent liabilities	0
Total liabilities assumed	(1.3)
Net assets acquired	$ 0.7
deBoer Transportation, Inc.
Business Acquisition
Goodwill		6.1
deBoer Transportation, Inc. | Truckload
Business Acquisition
Goodwill acquired during period		7.7
deBoer Transportation, Inc. | Restatement Adjustment
Business Acquisition
Goodwill		(1.6)
Midwest Logistics Systems (MLS)
Business Acquisition
Cash and cash equivalents		1.8		0
Trade accounts receivable—net of allowance		11.9		18.6
Other receivables		2.4		0.9
Prepaid expenses and other current assets		1.6		1.6
Net property and equipment		148.1		148.9
Internal use software and other noncurrent assets		11.7		0
Goodwill		104.3		122.7
Total assets acquired		281.8		292.7
Trade accounts payable		3.4		1.8
Accrued salaries, wages, and benefits		2.6		1.7
Claims liabilities—current		4.5		7.5
Other current liabilities		3.3		7.2
Deferred income taxes		(1.1)		0
Other noncurrent liabilities		0.3		0
Total liabilities assumed		13		18.2
Net assets acquired		268.8		$ 274.5
Midwest Logistics Systems (MLS) | Restatement Adjustment
Business Acquisition
Cash and cash equivalents		1.8
Trade accounts receivable—net of allowance		(6.7)
Other receivables		1.5
Prepaid expenses and other current assets		0
Net property and equipment		(0.8)
Internal use software and other noncurrent assets		11.7
Goodwill		(18.4)
Total assets acquired		(10.9)
Trade accounts payable		1.6
Accrued salaries, wages, and benefits		0.9
Claims liabilities—current		(3)
Other current liabilities		(3.9)
Deferred income taxes		(1.1)
Other noncurrent liabilities		0.3
Total liabilities assumed		(5.2)
Net assets acquired		$ (5.7)

Business Combinations and Ass_7

Business Combinations and Asset Acquisitions- Pro Forma Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
M&M Transport Services, LLC (M&M)
Business Acquisition
Pro forma operating revenues	$ 5,569.6	$ 6,729.6	$ 5,720.5
Midwest Logistics Systems (MLS)
Business Acquisition
Pro forma operating revenues			$ 5,816

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Noncash consideration recorded as revenue	$ 0	$ 16	$ 6.3
Timing of payment after completion of performance obligations	40 days

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregated of Revenues
Operating revenues	$ 5,498.9	$ 6,604.4	$ 5,608.7
Transportation
Disaggregated of Revenues
Operating revenues	5,102	6,119.9	5,166.7
Logistics Management
Disaggregated of Revenues
Operating revenues	190.1	274.2	219
Other
Disaggregated of Revenues
Operating revenues	$ 206.8	$ 210.3	$ 223

Revenue Recognition - Remaining

Revenue Recognition - Remaining Performance Obligation (Details) $ in Millions	Dec. 31, 2023 USD ($)
Remaining Performance Obligation
Remaining performance obligations	$ 95.8
Expected to be recognized within one year | Transportation
Remaining Performance Obligation
Remaining performance obligations	27.2
Expected to be recognized within one year | Logistics Management
Remaining Performance Obligation
Remaining performance obligations	17.3
Expected to be recognized after one year | Transportation
Remaining Performance Obligation
Remaining performance obligations	36.6
Expected to be recognized after one year | Logistics Management
Remaining Performance Obligation
Remaining performance obligations	$ 14.7

Revenue Recognition - Contract

Revenue Recognition - Contract Balances (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Contract assets	$ 23.7	$ 27	$ 33.8
Contract liabilities	$ 0	$ 2.6	$ 3.2

Fair Value - Recurring Fair Val

Fair Value - Recurring Fair Value Measurements (Details) - Recurring fair value measurement - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Level 1
Fair Value, Assets Measured on Recurring or Nonrecurring Basis
Equity investment in TuSimple	$ 0.3	$ 0.6
Level 2
Fair Value, Assets Measured on Recurring or Nonrecurring Basis
Marketable securities	$ 57.2	$ 45.9

Fair Value - Other Financial In

Fair Value - Other Financial Instruments (Details) - Unsecured Senior Notes - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets Measured on Recurring or Nonrecurring Basis
Long-term debt	$ 185	$ 205
Level 2
Fair Value, Assets Measured on Recurring or Nonrecurring Basis
Fair value of debt	$ 183.2	$ 199.1

Fair Value - Nonrecurring Fair

Fair Value - Nonrecurring Fair Value Measurements (Details) $ in Millions	Dec. 31, 2023 USD ($)
Nonrecurring fair value measurement | Level 2
Fair Value, Assets Measured on Recurring or Nonrecurring Basis
Fair value of assets held for sale	$ 6.4

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Other Investments
Value in investments without readily determinable fair values	$ 121.8	$ 86
Net loss on investment	0.3	$ 12.1
Mastery Logistics | Notes Receivable
Other Investments
Notes receivable	$ 10

Investments - Schedule of Marke

Investments - Schedule of Marketable Securities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Available for Sale Debt Securities
Amortized cost	$ 60.4	$ 50.3
U.S. treasury and government agencies
Available for Sale Debt Securities
Amortized cost	$ 24.9	21.9
U.S. treasury and government agencies | Minimum
Available for Sale Debt Securities
Maturity date	Aug. 31, 2024
U.S. treasury and government agencies | Maximum
Available for Sale Debt Securities
Maturity date	Feb. 15, 2031
Corporate debt securities
Available for Sale Debt Securities
Amortized cost	$ 20	16
Corporate debt securities | Minimum
Available for Sale Debt Securities
Maturity date	Apr. 01, 2024
Corporate debt securities | Maximum
Available for Sale Debt Securities
Maturity date	Apr. 01, 2033
State and municipal bonds
Available for Sale Debt Securities
Amortized cost	$ 15.5	12.4
State and municipal bonds | Minimum
Available for Sale Debt Securities
Maturity date	Jun. 01, 2024
State and municipal bonds | Maximum
Available for Sale Debt Securities
Maturity date	Oct. 01, 2038
Current asset
Available for Sale Debt Securities
Fair value	$ 57.2	45.9
Current asset | U.S. treasury and government agencies
Available for Sale Debt Securities
Fair value	22.9	19.3
Current asset | Corporate debt securities
Available for Sale Debt Securities
Fair value	19.2	14.9
Current asset | State and municipal bonds
Available for Sale Debt Securities
Fair value	$ 15.1	$ 11.7

Investments - Equity Investment

Investments - Equity Investments without Readily Determinable Fair Values (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Investments
Investment in equity security	$ 15.8	$ 24	$ 0
Upward adjustments	20	$ 25.8	$ 13.9
Cumulative upward adjustments	$ 72

Investments - Investment in TuS

Investments - Investment in TuSimple (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Other Investments
Net loss on investment	$ 0.3	$ 12.1

Investments - Equity Method Inv

Investments - Equity Method Investment (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Other Investments
Investment in equity method investment	$ 5
Income (loss) from equity method investments	0.1
Equity method investments	$ 4.9
Scope 23
Other Investments
Ownership interest in investment	50%

Goodwill - Schedule of Changes

Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Aug. 01, 2023	Dec. 31, 2021
Goodwill
Goodwill acquired during period	$ 104.6	$ 7.7
Acquisition adjustments	(1.1)	(20)
Goodwill	331.7	228.2		$ 240.5
deBoer Transportation, Inc.
Goodwill
Goodwill		6.1
M&M Transport Services, LLC (M&M)
Goodwill
Goodwill	103.5		$ 104.6
Truckload
Goodwill
Goodwill	317.5	214		226.3
Truckload | deBoer Transportation, Inc.
Goodwill
Goodwill acquired during period		7.7
Truckload | Midwest Logistics Systems (MLS) and deBoer Transportation, Inc.
Goodwill
Acquisition adjustments		(20)
Truckload | M&M Transport Services, LLC (M&M)
Goodwill
Goodwill acquired during period	104.6
Acquisition adjustments	(1.1)
Logistics
Goodwill
Goodwill acquired during period	0	0
Acquisition adjustments	0	0
Goodwill	$ 14.2	$ 14.2		$ 14.2

Intangibles - Schedule of Chang

Intangibles - Schedule of Changes in Carrying Amount of Intangibles (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets
Gross carrying amount	$ 59.8	$ 10
Accumulated amortization	3.7	1
Net carrying amount	56.1	9
Customer Relationships
Finite-Lived Intangible Assets
Gross carrying amount	43.5	3.2
Accumulated amortization	1.8	0.3
Net carrying amount	41.7	2.9
Trademarks
Finite-Lived Intangible Assets
Gross carrying amount	10.9	6.8
Accumulated amortization	1.5	0.7
Net carrying amount	9.4	6.1
Noncompete Agreements
Finite-Lived Intangible Assets
Gross carrying amount	5.4	0
Accumulated amortization	0.4	0
Net carrying amount	$ 5	$ 0

Intangibles - Schedule of Futur

Intangibles - Schedule of Future Amortization Expense (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets
2024	$ 5
2025	5
2026	5
2027	5
2028	4.6
2029 and thereafter	31.5
Net carrying amount	$ 56.1	$ 9

Goodwill - Additional Informati

Goodwill - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets
Accumulated goodwill impairment charge	$ 34,600,000	$ 34,600,000
Goodwill impairment charge	$ 0	$ 0	$ 10,600,000

Intangibles - Additional Inform

Intangibles - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets
Amortization of intangible assets	$ 2.7	$ 1
M&M Transport Services, LLC (M&M)
Finite-Lived Intangible Assets
Customer relationships	40.3
Non-compete agreements,	5.4
Trademarks	$ 4.1
Weighted average useful life	13 years 10 months 24 days
M&M Transport Services, LLC (M&M) | Customer Relationships
Finite-Lived Intangible Assets
Weighted average useful life	15 years
M&M Transport Services, LLC (M&M) | Trademarks
Finite-Lived Intangible Assets
Weighted average useful life	15 years
M&M Transport Services, LLC (M&M) | Noncompete Agreements
Finite-Lived Intangible Assets
Weighted average useful life	5 years

Debt and Credit Facilities - Su

Debt and Credit Facilities - Summary of Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument
Total debt and credit facilities	$ 290	$ 205
Current maturities	(100)	(70)
Long-term debt and credit facilities	$ 190	$ 135
Unsecured Senior Notes
Debt Instrument
Long-term debt frequency of interest payments.	semiannual
Weighted-average interest rate	3.68%	3.93%
Long-term debt	$ 185	$ 205
Unsecured Senior Notes | Minimum
Debt Instrument
Maturity year	2024
Unsecured Senior Notes | Maximum
Debt Instrument
Maturity year	2028
Credit Facility
Debt Instrument
Weighted-average interest rate	6.43%
Long-term debt	$ 45	0
Receivables Purchase Agreement
Debt Instrument
Weighted-average interest rate	6.28%
Short-term debt	$ 60	$ 0

Debt and Credit Facilities - Sc

Debt and Credit Facilities - Schedule of Debt Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument
2024	$ 100
2025	95
2026	0
2027	45
2028	50
Total debt and credit facilities	$ 290	$ 205

Debt and Credit Facilities - Ad

Debt and Credit Facilities - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Unsecured Senior Notes
Debt Instrument
Long-term debt frequency of interest payments.	semiannual
Change of control threshold	50%
Long-term debt	$ 185	$ 205
Credit Facility
Debt Instrument
Current borrowing capacity	250
Potential increase amount	150
Maximum borrowing capacity	$ 400
Expiration date	Nov. 04, 2027
Change of control threshold	50%
Long-term debt	$ 45	0
Credit Facility | Standby Letters of Credit
Debt Instrument
Maximum borrowing capacity	100
Standby letters of credit	0.4	0.1
Receivables Purchase Agreement
Debt Instrument
Maximum borrowing capacity	$ 150
Expiration date	Jul. 30, 2024
Change of control threshold	50%
Receivables Purchase Agreement | Standby Letters of Credit
Debt Instrument
Standby letters of credit	$ 81.4	$ 77.1
2023 PGIM Note Payable
Debt Instrument
Long-term debt, interest rate	5.63%
Long-term debt frequency of interest payments.	semiannual
Long-term debt	$ 50
Minimum | Unsecured Senior Notes
Debt Instrument
Debt prepayment terms	20 days
Maximum | Unsecured Senior Notes
Debt Instrument
Debt prepayment terms	60 days

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases
Operating lease right-of-use asset	$ 82.9	$ 63.5
Operating lease right-of-use asset impairment loss	0	0.1	$ 0
Operating lease payments related to options to extend that are reasonably certain to exercise	1
Leases not yet commenced	0.5
Total minimum lease payments to be received	265.7	$ 324.5
Financial Asset, Past Due
Leases
Total minimum lease payments to be received	3.4
With any portion past due
Leases
Net investment in leases	$ 71
Minimum
Leases
Lease terms of leases not yet commenced	3 years
Terms of sales-type leases	1 year
Maximum
Leases
Lease terms of leases not yet commenced	5 years
Terms of sales-type leases	3 years

Leases - Schedule of Net Lease

Leases - Schedule of Net Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lease costs
Operating lease cost	$ 36.7	$ 32.9	$ 31.3
Short-term lease cost	7.7	6.3	3
Amortization of right-of-use assets	3.9	2.2	0.8
Interest on lease liabilities	0.5	0.2	0.1
Variable lease cost	2.7	2.9	0.9
Sublease income	(2.3)	(3)	(4.5)
Total net lease cost	$ 49.2	$ 41.5	$ 31.6

Leases - Schedule of Remaining

Leases - Schedule of Remaining Lease Terms and Discount Rates (Details)	Dec. 31, 2023 Rate	Dec. 31, 2022 Rate
Weighted-average remaining lease term
Operating leases - remaining lease terms	3 years 9 months 18 days	3 years 2 months 12 days
Finance leases - remaining lease terms	3 years 2 months 12 days	3 years 2 months 12 days
Weighted-average discount rate
Operating leases - weighted average discount rate	5%	3.70%
Finance leases - weighted average discount rate	5%	4.30%

Leases - Schedule of Other Leas

Leases - Schedule of Other Lease Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating cash flows for operating leases	$ 36.7	$ 33.3	$ 31.4
Operating cash flows for finance leases	0.5	0.2	0.1
Financing cash flows for finance leases	3.9	2	0.8
Right-of-use assets obtained in exchange for new operating lease liability	52.6	23.7	28.7
Right-of-use assets obtained in exchange for new finance lease liability	$ 5.8	$ 6.8	$ 4.1

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Lease Payments for Operating Leases (Details) $ in Millions	Dec. 31, 2023 USD ($)
Leases
2024	$ 33.8
2025	25
2026	15.5
2027	8.6
2028	6.7
2029 and thereafter	7.3
Total	96.9
Amount representing interest	(8.9)
Present value of lease payments	88
Current maturities	(30.4)
Long-term lease obligations	$ 57.6

Leases - Schedule of Future M_2

Leases - Schedule of Future Minimum Lease Payments for Finance Leases (Details) $ in Millions	Dec. 31, 2023 USD ($)
Finance Leases
2024	$ 4.9
2025	3.9
2026	2.3
2027	1.2
2028	0.7
2029 and thereafter	0
Total	13
Amount representing interest	(0.9)
Present value of lease payments	12.1
Current maturities	(4.5)
Long-term lease obligations	$ 7.6

Leases - Schedule of Finance Le

Leases - Schedule of Finance Leased Right-of-Use Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Leases
Accumulated amortization	$ (7.7)	$ (3.3)
Finance lease right-of-use asset, net	11.7	9.7
Transportation equipment
Leases
Finance lease right-of-use asset, gross	7.9	3.1
Real property
Leases
Finance lease right-of-use asset, gross	1.1	1
Other property
Leases
Finance lease right-of-use asset, gross	$ 10.4	$ 8.9

Leases - Schedule of Investment

Leases - Schedule of Investment in Lease Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Future minimum payments to be received on leases	$ 161.8	$ 198.4
Guaranteed residual lease values	103.9	126.1
Total minimum lease payments to be received	265.7	324.5
Unearned income	(42.2)	(50.2)
Net investment in leases	$ 223.5	$ 274.3

Leases - Schedule of Principal

Leases - Schedule of Principal Amounts to be Received on Lease Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
2024	$ 118.2
2025	86.8
2026	60.2
2027	0.5
Total minimum lease payments to be received	265.7	$ 324.5
Unearned income	(42.2)	(50.2)
Net investment in leases	223.5	274.3
Current lease receivables—net of allowance	(93.3)	(111.2)
Lease receivables	$ 130.2	$ 163.1

Leases - Schedule of Sales-type

Leases - Schedule of Sales-type Lease Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Revenue	$ 206.1	$ 195	$ 206.1
Cost of goods sold	(174.9)	(161.8)	(177.6)
Operating profit	31.2	33.2	28.5
Interest income on lease receivable	$ 36.1	$ 37	$ 32.4

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Accrued interest and penalties on unrecognized tax benefits	$ 2.7	$ 3.1
Carryforwards
State net operating loss carryforwards	169.8
Deferred tax assets for state net operating loss carryforwards	9.4
Deferred tax asset for state credit carryforwards	0.4
Valuation allowance	$ 0.9	$ 12.8
Minimum
Carryforwards
State net operating loss carryforward - expiration date	Jan. 01, 2023
Maximum
Carryforwards
State net operating loss carryforward - expiration date	Dec. 31, 2043
Tax Year 2020
Income Tax Contingency
Open tax year for examination by IRS	2020
Tax Year 2021
Income Tax Contingency
Open tax year for examination by IRS	2021
Tax Year 2022
Income Tax Contingency
Open tax year for examination by IRS	2022
State credit carryforward
Carryforwards
Carryforwards	$ 1.2
Capital loss carryforward
Carryforwards
Carryforwards	$ 0
Capital loss carryforward | Minimum
Carryforwards
Carryforwards - expiration date	Jan. 01, 2023
Capital loss carryforward | Maximum
Carryforwards
Carryforwards - expiration date	Dec. 31, 2027
State deferred tax assets
Carryforwards
Valuation allowance	$ 0.9

Income Taxes - Components of th

Income Taxes - Components of the Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 15.2	$ 28.1	$ 112.5
Foreign	(10.1)	15.8	0
State	6.7	19.3	22.1
Current income tax provision	11.8	63.2	134.6
Deferred:
Federal	47.7	82.8	0.8
State and other	8.1	0.2	1.2
Deferred income tax provision for	55.8	83	2
Total provision for income taxes	$ 67.6	$ 146.2	$ 136.6

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income tax at federal statutory rate	$ 64.3	$ 126.8	$ 113.8
Corporate income tax rate	21%	21%	21%
State tax—net of federal effect	$ 13.8	$ 15.4	$ 18.9
State tax—net of federal effect, rate	4.50%	2.60%	3.50%
Valuation allowance	$ (10.7)	$ 10.7	$ 0
Valuation allowance, rate	(3.50%)	1.80%	0%
Other—net	$ 0.2	$ (6.7)	$ 3.9
Other—net, rate	0.10%	(1.20%)	0.70%
Total provision for income taxes	$ 67.6	$ 146.2	$ 136.6
Total provision for income taxes, rate	22.10%	24.20%	25.20%

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Compensation and employee benefits	$ 8.1	$ 7.8
Operating lease liabilities	21.4	16.4
State net operating losses and credit carryforwards	10.5	9.4
Other	14.2	14.9
Total gross deferred tax assets	54.2	59.2
Valuation allowance	(0.9)	(12.8)
Total deferred tax assets—net of valuation allowance	53.3	46.4
Deferred tax liabilities:
Property and equipment	596.3	548
Prepaid expenses	6.8	5.6
Intangible assets	8.1	2.4
Operating lease right-of-use assets	19.6	15.2
Other	18.2	13.4
Total gross deferred tax liabilities	649	584.6
Net deferred tax liability	595.7	538.2
Foreign
Carryforwards
Deferred tax assets for capital loss carryforwards	$ 0	$ 10.7

Income Taxes - Schedule of Unre

Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Gross unrecognized Tax Benefit Roll Forward
Gross unrecognized tax benefits—beginning of year	$ 6	$ 5.2	$ 4.3
Gross increases—tax positions related to current year	0	1	0.9
Gross (decreases)—tax positions taken in prior years	(0.5)	(0.2)	0
Settlements	(1.1)	0	0
Gross unrecognized tax benefits—end of year	$ 4.4	$ 6	$ 5.2

Common Equity - Calculation of

Common Equity - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic earnings per common share
Net income available to common shareholders	$ 238.5	$ 457.8	$ 405.4
Weighted average common shares outstanding	177.3	177.9	177.6
Diluted earnings per common share
Dilutive effect of share-based awards and options outstanding	0.8	0.9	0.5
Weighted Average Number of Shares Outstanding, Diluted	178.2	178.8	178.1
Basic earnings per share	$ 1.35	$ 2.57	$ 2.28
Diluted earnings per share	$ 1.34	$ 2.56	$ 2.28
Anti-dilutive share-based awards and options excluded from computation of diluted earnings per share	0.2	0.3	0.8

Common Equity- Schedule of comm

Common Equity- Schedule of common shares outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Class A Common Shares
Class of Stock
Common shares outstanding	83,029,500	83,029,500
Common shares outstanding	83,029,500	83,029,500	83,029,500
Class B Common Stock
Class of Stock
Common shares outstanding	94,993,144	94,626,740	94,311,653
Repurchases of common stock	(2,505,267)	0	0
Share issuances	681,642	306,071	370,226
Exercise of employee stock options	6,000	150,692	42,904
Shares withheld for emplyoee taxes	(244,277)	(90,359)	(98,043)
Common shares outstanding	92,931,242	94,993,144	94,626,740

Common Equity - Additional Info

Common Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Jan. 29, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Class of Stock
Dividends declared per share		$ 0.36	$ 0.32	$ 0.28
Stock repurchase program- amount authorized		$ 150
Treasury stock, value		66.9	$ 0
Repurchase Program 2023
Class of Stock
Treasury stock, value		$ 66.2
Class A Common Shares
Class of Stock
Common stock, shares authorized (shares)		250,000,000	250,000,000
Dividends declared per share		$ 0.36	$ 0.32	0.28
Class B Common Stock
Class of Stock
Common stock, shares authorized (shares)		750,000,000	750,000,000
Dividends declared per share		$ 0.36	$ 0.32	$ 0.28
Preferred Stock
Class of Stock
Preferred stock, shares authorized (shares)		50,000,000	50,000,000
Subsequent Event
Class of Stock
Dividend payment date	Apr. 09, 2024
Record date	Mar. 08, 2024
Subsequent Event | Class A Common Shares | Quarterly Dividend Declared
Class of Stock
Dividends declared per share	$ 0.095
Subsequent Event | Class B Common Stock | Quarterly Dividend Declared
Class of Stock
Dividends declared per share	$ 0.095

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Retirement Plan
Employee Benefit Plan Disclosure
Employee benefit plan expense	$ 13.5	$ 12.1	$ 11.3
401K Plan
Employee Benefit Plan Disclosure
Employee benefit plan expense	$ 15.4	$ 14.2	$ 12.9

Share-based Compensation - Addi

Share-based Compensation - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
2017 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized compensation cost related to outstanding share-based compensation awards	$ 16.4
Unrecognized compensation cost related to outstanding share-based compensation awards, recognition period	1 year 10 months 24 days
Share-based compensation expense	$ 15.6	$ 15.8	$ 13.3
Restricted Shares and RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	9.7	5.7	5.8
Performance shares and PSUs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	3.9	8.7	6.1
Non-Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	2	1.4	1.4
Equity based awards | Nonemployee Director
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	1.4	1.4	1.3
Liability based awards | Nonemployee Director
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	$ 1.1	$ 0.9	$ 1.2

Share-based Compensation - Comp

Share-based Compensation - Components of Share-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Related tax benefit	$ 3.5	$ 3.8	$ 3.3
2017 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	15.6	15.8	13.3
Restricted shares and RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	9.7	5.7	5.8
Performance shares and PSUs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	3.9	8.7	6.1
Non-Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	$ 2	$ 1.4	$ 1.4

Share-based Compensation - Rest

Share-based Compensation - Restricted Shares and RSUs (Details) - Restricted Shares and RSUs - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Number of Awards
Unvested, beginning balance (in shares)	695,467	679,259	589,587
Granted (in shares)	378,453	322,316	341,508
Vested (in shares)	(272,678)	(256,779)	(229,226)
Forfeited (in shares)	(53,685)	(49,329)	(22,610)
Unvested, ending balance (in shares)	747,557	695,467	679,259
Weighted Average Grant Date Fair Value
Unvested, beginning balance (usd per share)	$ 23.92	$ 22.84	$ 22.96
Granted (usd per share)	28.45	25.85	22.61
Vested (usd per share)	23.41	23.49	22.82
Forfeited (usd per share)	26.21	23.91	22.77
Unvested, ending balance (usd per share)	$ 26.24	$ 23.92	$ 22.84
Awards 2023 and after
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	3 years
Awards before 2023
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	4 years
First period
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	1 year

Share-based Compensation - Perf

Share-based Compensation - Performance Shares and PSUs (Details) - Performance shares and PSUs - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Performance period	3 years
Number of Awards
Unvested, beginning balance (in shares)	602,999	781,280	655,022
Granted (in shares)	237,886	224,455	439,620
Vested (in shares)	(310,648)	(304,794)	0
Forfeited (in shares)	(129,682)	(97,942)	(313,362)
Unvested, ending balance (in shares)	400,555	602,999	781,280
Weighted Average Grant Date Fair Value
Unvested, beginning balance (usd per share)	$ 25.77	$ 23.39	$ 22.15
Granted (usd per share)	31.60	28.32	24.44
Vested (usd per share)	24.43	22.04	0
Forfeited (usd per share)	26.40	24.23	22.27
Unvested, ending balance (usd per share)	$ 30.07	$ 25.77	$ 23.39
Expected term	2 years 10 months 13 days	2 years 10 months 13 days	2 years 10 months 13 days
Expected volatility	39.30%	45.30%	45.80%
Risk-free interest rate	4.30%	1.80%	0.20%
Minimum | Awards 2021 and after
Share-based Compensation Arrangement by Share-based Payment Award
Payout range	0%
Minimum | Awards prior to 2021
Share-based Compensation Arrangement by Share-based Payment Award
Payout range	0%
Maximum | Awards 2021 and after
Share-based Compensation Arrangement by Share-based Payment Award
Payout range	250%
Maximum | Awards prior to 2021
Share-based Compensation Arrangement by Share-based Payment Award
Payout range	200%

Share-based Compensation - Pe_2

Share-based Compensation - Performance Shares and PSUs Assumptions (Details) - Performance shares and PSUs - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Expected dividend yield	0%	0%	0%
Weighted-average Monte Carlo value (usd per share)	$ 31.60	$ 28.32	$ 24.44
Expected term	2 years 10 months 13 days	2 years 10 months 13 days	2 years 10 months 13 days
Expected volatility	39.30%	45.30%	45.80%
Risk-free interest rate	4.30%	1.80%	0.20%

Share-based Compensation - Nonq

Share-based Compensation - Nonqualified Stock Options (Details) - Non-Qualified Stock Options - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	4 years
Expiration period	10 years
Number of Awards, Outstanding
Outstanding, beginning balance (in shares)	1,038,643	948,664	685,900
Granted (in shares)	0	311,501	305,668
Exercise of employee stock options	(6,000)	(150,692)	(42,904)
Forfeited (in shares)	(61,946)	(70,830)	0
Outstanding, ending balance (in shares)	970,697	1,038,643	948,664	685,900
Weighted Average Exercise Price, Outstanding
Weighted average exercise price, beginning balance	$ 22.39	$ 21.42	$ 20.60
Weighted average exercise price, granted	0	25.58	22.63
Weighted average exercise price, exercised	18.99	22.65	17
Weighted average exercise price, forfeited	23.71	22.92	0
Weighted average exercise price, ending balance	$ 22.33	$ 22.39	$ 21.42	$ 20.60
Additional Option Disclosures
Weighted Average Remaining Contractual Term (in years)	5 years 9 months 18 days	7 years 7 months 6 days	7 years 3 months 18 days	7 years 1 month 6 days
Aggregate intrinsic value, outstanding	$ 3,140,000	$ 1,794,000	$ 5,208,000	$ 735,000
Aggregate intrinsic value, exercised	$ 64,000	$ 467,000	$ 243,000
Number of awards exercisable (in shares)	630,171	402,945	329,711
Weighted average exercise price of exercisable awards (in dollars per share)	$ 21.48	$ 20.89	$ 21.15
Weighted average remaining contractual term of exercisable awards (in years)	4 years 10 months 24 days	6 years 4 months 24 days	5 years 8 months 12 days
Aggregate intrinsic value of exercisable awards	$ 2,531,000	$ 1,098,000	$ 1,898,000
Aggregate intrinsic value share price	$ 25.45	$ 23.40	$ 26.91
Proceeds from stock options exercised	$ 100,000	$ 3,400,000	$ 700,000
Number of Awards, Unvested
Unvested, beginning balance (in shares)	635,698	618,953	506,007
Granted (in shares)	0	311,501	305,668
Vested (in shares)	(233,226)	(223,926)	(192,722)
Forfeited (in shares)	(61,946)	(70,830)	0
Unvested, ending balance (in shares)	340,526	635,698	618,953	506,007
Weighted Average Exercise Price, Unvested
Weighted average grant date fair value, beginning balance	$ 6.65	$ 6.34	$ 6.89
Weighted average grant date fair value, granted	0	7.32	5.86
Weighted average grant date fair value, vested	6.59	6.75	7.01
Weighted average grant date fair value, forfeited	6.64	6.55	0
Weighted average grant date fair value, ending balance	$ 6.69	$ 6.65	$ 6.34	$ 6.89
First period
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	1 year
Vesting percentage	25%
Second period
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	25%
Third period
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	25%
Fourth period
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	25%

Share-based Compensation - Stoc

Share-based Compensation - Stock Option Assumptions (Details) - Non-Qualified Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Weighted-average Black-Scholes value (usd per share)	$ 7.32	$ 5.86
Black-Scholes assumptions:
Expected term	6 years 3 months	6 years 3 months
Expected volatility	30%	30%
Expected dividend yield	1.20%	1.20%
Risk-free interest rate	2.10%	0.70%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Other Commitments
Commitments to purchase transportation equipment	$ 236.7
Loss Contingencies
Loss contingency expense	$ 2.9	$ 5.2
WSL
Loss Contingencies
Loss contingency damages sought		40
Loss contingency damages awarded		40
Loss contingency expense		$ 57

Segment Reporting - Additional

Segment Reporting - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information
Number of reportable segments | Segment	3
Operating revenues | $	$ 5,498.9	$ 6,604.4	$ 5,608.7
Truckload
Segment Reporting Information
Number of operating segments | Segment	3
Logistics
Segment Reporting Information
Number of operating segments | Segment	2
Other
Segment Reporting Information
Operating revenues | $	$ 333.4	364	365.3
Other | Other Insurance
Segment Reporting Information
Operating revenues | $	$ 77.5	$ 73.5	$ 62.4

Segment Reporting - Revenue by

Segment Reporting - Revenue by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information
Operating revenues	$ 5,498.9	$ 6,604.4	$ 5,608.7
Truckload
Segment Reporting Information
Revenues excluding fuel surcharge	2,155.7	2,236.6	1,934.9
Intermodal
Segment Reporting Information
Revenues excluding fuel surcharge	1,050.7	1,287.4	1,143.1
Logistics
Segment Reporting Information
Revenues excluding fuel surcharge	1,393.7	1,956.2	1,808.7
Other
Segment Reporting Information
Operating revenues	333.4	364	365.3
Fuel Surcharge
Segment Reporting Information
Operating revenues	684.3	862.5	444.8
Inter-segment Eliminations
Segment Reporting Information
Operating revenues	$ (118.9)	$ (102.3)	$ (88.1)

Segment Reporting - Income (Los

Segment Reporting - Income (Loss) from Operations by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information
Income from operations	$ 296.4	$ 600.4	$ 533.7
Truckload
Segment Reporting Information
Income from operations	170.7	352.2	284.7
Intermodal
Segment Reporting Information
Income from operations	71	165.1	155.2
Logistics
Segment Reporting Information
Income from operations	45.9	141.2	92.4
Other
Segment Reporting Information
Income from operations	$ 8.8	$ (58.1)	$ 1.4

Segment Reporting - Depreciatio

Segment Reporting - Depreciation and Amortization by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information
Depreciation and amortization	$ 382.5	$ 350	$ 296.2
Truckload
Segment Reporting Information
Depreciation and amortization	278.7	249.3	210.2
Intermodal
Segment Reporting Information
Depreciation and amortization	53.4	57.2	48.4
Logistics
Segment Reporting Information
Depreciation and amortization	0.1	0.1	0.2
Other
Segment Reporting Information
Depreciation and amortization	$ 50.3	$ 43.4	$ 37.4

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for doubtful accounts and revenue adjustments - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves
Balance at Beginning of Year	$ 13.7	$ 5.2	$ 3.7
Charged to Expense / Against Revenue	7.9	10.6	2.3
Write-offs—Net of Recoveries	(6.6)	(2.1)	(0.8)
Balance at End of Year	$ 15	$ 13.7	$ 5.2