Schneider National (SNDR) 10-Q 30 Apr 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	3 Months Ended
	Mar. 31, 2018shares
Document Information [Line Items]
Document Type	10-Q
Entity Registrant Name	Schneider National, Inc.
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	SNDR
Entity Central Index Key	1,692,063
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Class A Common Shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (shares)	83,029,500
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (shares)	94,603,373

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
OPERATING REVENUES	$ 1,139	$ 1,006.4
OPERATING EXPENSES:
Purchased transportation	425	367.3
Salaries, wages, and benefits	311.3	297.7
Fuel and fuel taxes	84.7	73.2
Depreciation and amortization	71.7	67.9
Operating supplies and expenses	119.1	106.3
Insurance and related expenses	23.1	21.8
Other general expenses, net	36.5	28.7
Total operating expenses	1,071.4	962.9
INCOME FROM OPERATIONS	67.6	43.5
OTHER EXPENSES (INCOME):
Interest expense—net	3.5	5.5
Other expenses (income)—net	(0.4)	0.1
Total other expenses	3.1	5.6
INCOME BEFORE INCOME TAXES	64.5	37.9
PROVISION FOR INCOME TAXES	16.9	15.3
NET INCOME	47.6	22.6
OTHER COMPREHENSIVE INCOME (LOSS):
Foreign currency translation adjustments	(0.4)	(0.1)
Unrealized gain (loss) on marketable securities—net of tax	(0.2)	0.1
Total other comprehensive income (loss)	(0.6)	0
COMPREHENSIVE INCOME	$ 47	$ 22.6
Weighted average common shares outstanding (shares)	176.9	156.4
Basic earnings (usd per share)	$ 0.27	$ 0.14
Weighted average diluted shares outstanding (shares)	177.2	156.8
Diluted earnings (usd per share)	$ 0.27	$ 0.14
Dividends per share of common stock (usd per share)	$ 0.06	$ 0.05

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 300.1	$ 238.5
Marketable securities	40.3	41.6
Trade accounts receivable—net of allowance of $6.1 and $5.2, respectively	530.4	527.9
Other receivables	18.4	22.4
Current portion of lease receivables—net of allowance of $2.1 and $1.7, respectively	115.6	104.9
Inventories	73.2	83.1
Prepaid expenses and other current assets	115	75.6
Total current assets	1,193	1,094
Property and equipment:
Transportation equipment	2,771.5	2,770.1
Land, buildings, and improvements	174	183.8
Other property and equipment	177.3	175.7
Total property and equipment	3,122.8	3,129.6
Accumulated depreciation	1,275.6	1,271.5
Net property and equipment	1,847.2	1,858.1
Lease receivables	133.5	138.9
Capitalized software and other noncurrent assets	73.8	74.7
Goodwill	165.3	164.8
Total noncurrent assets	2,219.8	2,236.5
TOTAL	3,412.8	3,330.5
CURRENT LIABILITIES:
Trade accounts payable	270.6	230.4
Accrued salaries and wages	65.9	85.8
Claims accruals - current	54.4	48.3
Current maturities of debt and capital lease obligations	15.7	19.1
Dividends payable	10.7	8.8
Other current liabilities	75.4	69.6
Total current liabilities	492.7	462
NONCURRENT LIABILITIES:
Long-term Debt and Capital Lease Obligations	417.1	420.6
Claims accruals - noncurrent	103.5	102.5
Deferred income taxes	403	386.6
Other	62.1	68.6
Total noncurrent liabilities	985.7	978.3
SHAREHOLDERS' EQUITY
Additional paid-in capital	1,535.2	1,534.6
Retained earnings	399.8	355.6
Accumulated other comprehensive income	(0.6)	0
Total shareholders' equity	1,934.4	1,890.2
TOTAL	3,412.8	3,330.5
Class A Common Shares
SHAREHOLDERS' EQUITY
Common stock	0	0
Class B Common Stock
SHAREHOLDERS' EQUITY
Common stock	$ 0	$ 0

Consolidated Balance Sheets (U4

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Trade allowance	$ (6.1)	$ (5.2)
Allowance for lease receivables	$ (2.1)	$ (1.7)
Class A Common Shares
Common stock, par value (usd per share)	$ 0
Common stock, shares authorized (shares)	250,000,000
Common stock, shares issued (shares)	83,029,500
Common stock, shares outstanding (shares)	83,029,500
Class B Common Stock
Common stock, par value (usd per share)	$ 0
Common stock, shares authorized (shares)	750,000,000
Common stock, shares issued (shares)	94,596,670
Common stock, shares outstanding (shares)	93,951,067

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING ACTIVITIES:
Net income	$ 47.6	$ 22.6
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	71.7	67.9
Gains on sales of property and equipment	(0.9)	(3.2)
Deferred income taxes	14	15.1
Share-based Compensation	5.9	5.6
Other noncash items	(2.8)	(0.1)
Changes in operating assets and liabilities:
Receivables	1.7	21.4
Other assets	(24.2)	(20.5)
Payables	15.9	10.1
Other liabilities	(28.9)	(29.7)
Net cash provided by operating activities	100	89.2
INVESTING ACTIVITIES:
Purchases of transportation equipment	(44.8)	(39.3)
Purchases of other property and equipment	(7.5)	(8)
Proceeds from sale of property and equipment	26.3	15.3
Proceeds from lease receipts and sale of off-lease inventory	16.4	14.6
Purchases of lease equipment	(13.9)	(23.7)
Sales of marketable securities	0.9	3.1
Net cash used in investing activities	(22.6)	(38)
FINANCING ACTIVITIES:
Payments under revolving credit agreements	0	(85)
Payments of debt and capital lease obligations	(7)	(9.9)
Dividends paid	(8.8)	(7.8)
Net cash used in financing activities	(15.8)	(102.7)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	61.6	(51.5)
CASH AND CASH EQUIVALENTS:
Beginning of period	238.5	130.8
End of period	300.1	79.3
Noncash investing and financing activity:
Equipment purchases in accounts payable	33.8	35.3
Dividends payable	10.7	0
Costs In Accounts Payable From Initial Public Offering	0	5.2
Costs in accounts payable related to our IPO	0	126.6
Cash paid (refunded) during the period for:
Interest	5.4	6.1
Income taxes—net of refunds	$ 0.5	$ (15.6)

General

General	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	GENERAL Description of Business In this report, when we refer to “the Company,” “us,” “we,” “our,” or “ours,” we are referring to Schneider National, Inc. and its subsidiaries. We are a leading transportation services organization headquartered in Green Bay, Wisconsin. We provide a broad portfolio of premier truckload, intermodal, and logistics solutions and operate one of the largest trucking fleets in North America. Our IPO of shares of Class B Common Stock was completed in early April 2017, and additional shares were sold in May 2017 under an option granted to the underwriters. In connection with the offering, we sold a total of 20,145,000 shares of common stock at $19 per share and received proceeds of $382.7 million. Expenses related to the offering totaled approximately $42.1 million, resulting in net proceeds of $340.6 million. Basis of Presentation The accompanying unaudited interim Consolidated Financial Statements have been prepared in accordance with GAAP and the rules and regulations of the SEC applicable to quarterly reports on Form 10-Q. Therefore, these financial statements and footnotes do not include all disclosures required by GAAP for annual financial statements. These financial statements should be read in conjunction with the Consolidated Financial Statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2017. Financial results for an interim period are not necessarily indicative of the results for a full year. All intercompany transactions have been eliminated in consolidation. In the opinion of management, these statements reflect all adjustments (consisting only of normal recurring adjustments) necessary for the fair presentation of our financial results for the interim periods presented. Certain prior period amounts have been reclassified to conform with the current year presentation. Accounting Standards Issued But Not Yet Adopted In February 2016, the FASB issued ASU 2016-02, Leases , which requires lessees to recognize assets and liabilities in the consolidated balance sheets for leases with lease terms of more than 12 months. Consistent with current accounting principles, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, unlike current accounting principles, which require only capital leases to be recognized in the consolidated balance sheets, the new ASU will require both types of leases to be recognized in the consolidated balance sheets. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The modified retrospective approach includes a number of optional practical expedients that companies may elect to apply. These practical expedients relate to the identification and classification of leases that commenced before the effective date, initial direct costs for leases that commenced before the effective date, and the ability to use hindsight in evaluating lessee options to extend or terminate a lease or to purchase the underlying asset. The transition guidance also provides specific guidance for sale and leaseback transactions, build-to-suit leases, leveraged leases, and amounts previously recognized in accordance with the business combinations guidance for leases. The new standard is effective for us beginning with the reporting period ending March 31, 2019, with early adoption permitted. We expect an increase in our assets and liabilities from the recognition of operating leases on the consolidated balance sheets and are in the process of evaluating other potential impacts that the adoption of this ASU will have on our consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments , which requires companies to use a forward-looking, expected loss model to estimate credit losses on various types of financial assets and net investments in leases. It also requires additional disclosure related to credit quality of trade and other receivables, including information related to management’s estimate of credit allowances. This guidance is effective for us beginning with the reporting period ending March 31, 2020. We currently cannot reasonably estimate the impact that the adoption of this ASU will have on our consolidated financial statements.

Revenue Recognition Revenue Rec

Revenue Recognition Revenue Recognition	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	REVENUE RECOGNITION We implemented ASU 2014-09, Revenue from Contracts with Customers, which is codified as ASC 606, for the reporting period ended March 31, 2018 . We used the modified retrospective approach for adoption, which required us to record the cumulative effect of the transition through retained earnings as of January 1, 2018. Retained earnings increased by $7.3 million upon adoption. The adjustment related only to contracts that were not completed as of January 1, 2018. The following table shows the amount by which financial statement lines were affected by the adoption of the new standard. The changes relate to the recognition of transportation revenue over time rather than at delivery, as explained below under the Transportation heading. Three Months Ended March 31, 2018 Financial Statement Line Item ( in millions ) Under ASC 605 Adjustment As Reported Consolidated Statement of Comprehensive Income Operating revenues $ 1,138.5 $ 0.5 $ 1,139.0 Purchased transportation 424.2 0.8 425.0 Salaries, wages, and benefits 311.0 0.3 311.3 Total operating expenses 1,070.3 1.1 1,071.4 Income from operations 68.2 (0.6 ) 67.6 Provision for income taxes 17.1 (0.2 ) 16.9 Net income 48.0 (0.4 ) 47.6 Comprehensive Income 47.4 (0.4 ) 47.0 Consolidated Balance Sheet Prepaid expenses and other current assets 95.4 19.6 115.0 Total current assets 1,173.4 19.6 1,193.0 Total assets 3,393.2 19.6 3,412.8 Other current liabilities 65.1 10.3 75.4 Total current liabilities 482.4 10.3 492.7 Deferred income taxes 400.6 2.4 403.0 Total noncurrent liabilities 983.3 2.4 985.7 Retained earnings 392.9 6.9 399.8 Total shareholders' equity 1,927.5 6.9 1,934.4 Total liabilities and shareholders' equity 3,393.2 19.6 3,412.8 Consolidated Statement of Cash Flows Operating Cash Flows Net income 48.0 (0.4 ) 47.6 Other noncash items (3.4 ) 0.6 (2.8 ) Change in: Payables 16.1 (0.2 ) 15.9 ASC 606 requires us to look at revenue from customers at a contract level to determine the appropriate accounting. As defined by the new standard, a "contract" can range from an individual order to a multi-year agreement with a customer, depending on the specific arrangement. The majority of our revenues are related to transportation and have similar characteristics. The following table breaks down our revenues by type of service, and each type of service is further described below. Three Months Ended March 31, (in millions) 2018 2017 Transportation $ 1,049.9 $ 935.5 Logistics management 52.1 52.3 Other 37.0 18.6 Total operating revenues $ 1,139.0 $ 1,006.4 Transportation Transportation revenues relate to the Truckload and Intermodal reporting segments, as well as to our Brokerage business, which is included in the Logistics reporting 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 is 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 Schneider's influence, such as the weather or the accumulation of accessorial charges. Pricing information is supplied by the rate schedules that accompany negotiated contracts. Transportation orders are very short-term in nature and generally have 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 Dedicated business. These payments are due regardless of volumes, and in these arrangements, the master agreement rather than the individual order may be considered the "contract." See the Remaining Performance Obligations table below for more information on fixed payments. Prior to the adoption of ASC 606, we recognized revenue from transportation services when we completed our obligation to the customer, upon delivery. In accordance with the new standard, we now 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 that is 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 (start of transportation services) to the arrival date (completion of transportation services). 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. Revenue recognized in the period ended March 31, 2018 includes amounts related to orders that were partially completed (in transit) in prior periods. 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 all 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 Supply Chain Management and Import/Export Services operating segments, both of which are included in our Logistics reportable segment. Within this portfolio, the key service we provide to the customer is management of freight shipping and/or storage. The "contracts" in our Logistics Management portfolio are the 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. See the Remaining Performance Obligations table below for additional information. Supply Chain Management and Import/Export Services contracts typically have terms that extend beyond one year, and they do not include financing components. Prior to the adoption of ASC 606, we recognized revenue under these contracts over time, based on pricing terms within the arrangements. Our recognition model will remain the same under the new standard, as 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). 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 that they are acceptable to the customer, and we are therefore considered to be 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 the transactions and expected timing of revenue recognition related to performance obligations that are fixed in nature and relate to contracts with terms greater than one year. Remaining Performance Obligations (in millions) March 31, 2018 Expected to be recognized within one year Transportation $ 15.7 Logistics Management 14.7 Expected to be recognized after one year Transportation 1.3 Logistics Management 5.5 Total $ 37.2 This disclosure does not include revenue related to performance obligations that are part of a contract whose original expected duration is one year or less. In addition, this disclosure does not 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. Contract Balances ( in millions ) March 31, 2018 January 1, 2018 Other current assets - contract assets $ 22.8 $ 22.2 Other current liabilities - contract liabilities $ 8.3 $ — 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. For certain of our contracts, we incur upfront costs to fulfill the master agreement, including driver recruiting and equipment relocation, that are capitalized and amortized over the master contract term, which has been deemed to be the period of benefit. These costs usually relate to dedicated transportation arrangements. The following table presents the amounts capitalized for contract fulfillment costs. (in millions) March 31, 2018 December 31, 2017 Capitalized contract fulfillment costs $ 4.4 $ 3.7 Amortization of capitalized contract fulfillment costs was as follows: Three Months Ended March 31, 2018 (in millions) 2018 2017 Amortization of contract fulfillment costs $ 0.6 $ 0.6 Practical Expedients We elected to use the following practical expedients that are available under ASC 606: (i) 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; (ii) to apply the new revenue standard to a portfolio of contracts (or performance obligations) with similar characteristics, as we reasonably expect that the effects on the 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 (iii) to recognize revenue in the Logistics Management portfolio in 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	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value	FAIR VALUE Fair value focuses on the estimated price that would be received to sell an asset or paid to transfer a liability, which is referred to as the exit price. 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). All marketable securities were 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 (Level 2 in the fair value hierarchy). We measure our marketable securities on a recurring, monthly basis. See Note 4 , Marketable Securities , for information on the fair value of our marketable securities. In connection with the June 1, 2016 acquisition of WSL, a contingent payment arrangement based on the achievement of specified earnings targets is in place for three consecutive 12-month periods after the closing, with the aggregate payment total not to exceed $40.0 million. No payments have been made through March 31, 2018 . The fair value of the contingent consideration at March 31, 2018 and December 31, 2017 was zero . The valuation was based on Level 3 inputs. There were no transfers between levels for the periods shown. Fair Value of Other Financial Instruments The recorded value of cash, trade accounts receivable, and trade accounts payable approximates fair value. The table below presents the carrying value of our debt portfolio along with the fair value of a fixed-rate debt portfolio with similar terms and maturities, which is based on borrowing rates available to us in the applicable year. This valuation used Level 2 inputs. March 31, 2018 December 31, 2017 (in millions) Carrying Value Fair Value Carrying Value Fair Value Debt portfolio 423.8 418.1 429.8 432.4

Marketable Securities

Marketable Securities	3 Months Ended
	Mar. 31, 2018
Investments Schedule [Abstract]
Marketable Securities	MARKETABLE SECURITIES Our marketable securities have maturities ranging from 1 month to 80 months , but our intent is to hold them for less than one year. They are classified as available for sale and carried at fair value in current assets on the consolidated balance sheets. Any unrealized gains and losses, net of tax, are included as a component of accumulated other comprehensive income. The following table presents the values of our marketable securities as of the dates shown. March 31, 2018 December 31, 2017 (in millions) Amortized Cost Fair Value Amortized Cost Fair Value Zero coupon bonds $ 3.9 $ 3.8 $ 3.8 $ 3.9 U.S. treasury and government agencies 6.0 5.9 6.0 6.0 Asset-backed securities 0.1 0.2 0.3 0.3 Corporate debt securities 9.1 9.1 9.1 9.2 State and political subdivisions 21.7 21.3 22.7 22.2 Total marketable securities $ 40.8 $ 40.3 $ 41.9 $ 41.6 Gross realized and unrealized gains and losses on sales of marketable securities were not material for the three months ended March 31, 2018 and 2017 .

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill represents the excess of the purchase price of our acquisitions over the fair value of the identifiable net assets acquired. Changes in the carrying amount of goodwill were as follows: (in millions) Truckload Logistics Other Total Balance at December 31, 2017 $ 138.2 $ 14.2 $ 12.4 $ 164.8 Foreign currency translation — — 0.5 0.5 Balance at March 31, 2018 $ 138.2 $ 14.2 $ 12.9 $ 165.3 At March 31, 2018 and December 31, 2017 , we had accumulated goodwill impairment charges of $6 million . The identifiable intangible assets other than goodwill listed below are included in other noncurrent assets on the consolidated balance sheets. March 31, 2018 December 31, 2017 (in millions) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer lists $ 10.5 $ 2.7 $ 7.8 $ 10.5 $ 2.5 $ 8.0 Trade names 1.4 0.9 0.5 1.4 0.7 0.7 Total intangible assets $ 11.9 $ 3.6 $ 8.3 $ 11.9 $ 3.2 $ 8.7 Amortization expense for intangible assets was $0.4 million and $0.4 million for the three months ended March 31, 2018 and 2017 , respectively. Accumulated amortization in the table above includes foreign currency translation related to a customer list. Estimated future amortization expense related to intangible assets is as follows (in millions): Remaining 2018 $ 1.0 2019 1.1 2020 1.0 2021 1.0 2022 1.0 2023 and thereafter 3.2 $ 8.3

Debt and Credit Facilities

Debt and Credit Facilities	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Debt and Credit Facilities	DEBT AND CREDIT FACILITIES As of March 31, 2018 and December 31, 2017 , debt included the following: (in millions) March 31, December 31, Unsecured senior notes: principal payable at maturities ranging from 2019 through 2025; interest payable in semiannual installments through the same timeframe; weighted-average interest rate of 3.36% for both 2018 and 2017 $ 400.0 $ 400.0 Equipment financing notes: principal and interest payable in monthly installments through 2023; weighted average interest rate of 3.74% and 3.76% for 2018 and 2017, respectively 23.8 29.8 Total principal outstanding 423.8 429.8 Current maturities (12.2 ) (15.2 ) Debt issuance costs (0.8 ) (0.9 ) Long-term debt $ 410.8 $ 413.7 Our master revolving credit agreement provides borrowing capacity of up to $250.0 million through November 2018. This agreement also provides a sublimit of $100.0 million to be used for the issuance of letters of credit. We had no outstanding borrowings under this agreement as of March 31, 2018 or December 31, 2017 . Standby letters of credit under this agreement amounted to $3.9 million at March 31, 2018 and December 31, 2017 , and were primarily related to the requirements of certain of our real estate leases. We have a secured credit facility that allows us to borrow up to $200.0 million against qualifying trade receivables at rates based on the 30-day London InterBank Offered Rate. We had no outstanding borrowings under this facility at March 31, 2018 or December 31, 2017. At March 31, 2018 and December 31, 2017 , standby letters of credit under this agreement amounted to $63.3 million and $63.8 million, respectively, and were primarily related to the requirements of certain of our insurance obligations.

Lease Receivables

Lease Receivables	3 Months Ended
	Mar. 31, 2018
Leases [Abstract]
Lease Receivables	LEASE RECEIVABLES We finance various types of transportation-related equipment for independent third parties. The transactions are generally for one to five years and are accounted for as sales-type or direct financing leases. As of March 31, 2018 and December 31, 2017 , the investment in lease receivables was as follows: (in millions) March 31, 2018 December 31, 2017 Future minimum payments to be received on leases $ 141.2 $ 141.2 Guaranteed residual lease values 136.0 130.7 Total minimum lease payments to be received 277.2 271.9 Unearned income (28.1 ) (28.1 ) Net investment in leases 249.1 243.8 Current maturities of lease receivables 117.7 106.6 Less—allowance for doubtful accounts (2.1 ) (1.7 ) Current portion of lease receivables—net of allowance 115.6 104.9 Lease receivables—noncurrent $ 133.5 $ 138.9

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Our effective income tax rate was 26.2% and 40.5% for the three months ended March 31, 2018 , and 2017 , respectively. The decrease in the rate quarter over quarter was due to the enactment of the Tax Cuts and Jobs Act. In determining the quarterly provision for income taxes, we use an estimated annual effective tax rate, adjusted for discrete items. This rate is based on our expected annual income, statutory tax rates, and best estimate of nontaxable and nondeductible items of income and expense. In accordance with SEC Staff Accounting Bulletin No. 118, the amounts recorded in the fourth quarter of 2017 related to the Tax Cuts and Jobs Act represent reasonable estimates based on our analysis to date and are considered to be provisional and subject to revision during 2018. Provisional amounts were recorded for the remeasurement of our 2017 net deferred tax liabilities and ancillary state tax effects. These amounts are considered to be provisional as we continue to assess available tax methods and elections and refine our computations. In addition, further regulatory guidance related to the Tax Cuts and Jobs Act is expected to be issued in 2018 which may result in changes to our current estimates. Any revisions to the estimated impacts of the Tax Cuts and Jobs Act will be recorded quarterly until the computations are complete, which is expected to be no later than the fourth quarter of 2018. No changes were made to the estimated impacts in the first quarter of 2018.

Common Equity

Common Equity	3 Months Ended
	Mar. 31, 2018
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 three months ended March 31, 2018 and 2017 . Three Months Ended March 31, (in millions, except per share data) 2018 2017 Basic earnings per common share: Net income available to common shareholders $ 47.6 $ 22.6 Weighted average common shares issued and outstanding 176.9 156.4 Basic earnings per common share $ 0.27 $ 0.14 Diluted earnings per common share: Net income applicable to diluted earnings per common share $ 47.6 $ 22.6 Dilutive potential common shares: Restricted share units 0.3 0.4 Dilutive potential common shares 0.3 0.4 Total diluted average common shares issued and outstanding 177.2 156.8 Diluted earnings per common share $ 0.27 $ 0.14 The calculation of diluted earnings per share for the three months ended March 31, 2018 excluded an immaterial amount of share-based compensation awards that had an anti-dilutive effect. Subsequent Event - Dividends Declared In April 2018, our Board of Directors declared a quarterly cash dividend for the second fiscal quarter of 2018 in the amount of $0.06 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 June 15, 2018, and is expected to be paid on July 9, 2018.

Share-based Compensation

Share-based Compensation	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation	SHARE-BASED COMPENSATION We grant various equity-based awards relating to Class B Common Stock under our 2017 Omnibus Incentive Plan ("the Plan"). These awards consist of the following: restricted shares, restricted stock units ("RSUs"), performance-based restricted shares ("Performance Shares"), performance-based restricted stock units ("PSUs"), and non-qualified stock options. The following table summarizes the components of our share-based compensation program expense: Three Months Ended March 31, (in millions) 2018 2017 Restricted Shares and RSUs 0.6 — Pre-IPO Restricted Shares 0.5 0.6 Performance Shares and PSUs 0.6 — Nonqualified Stock Options 0.3 — Share-based compensation expense 2.0 0.6 Related tax benefit 0.5 0.2 As of March 31, 2018 , we had $17.6 million of pre-tax unrecognized compensation cost related to outstanding share-based compensation awards that is expected to be recognized over a weighted-average period of 2.8 years . Restricted Shares and RSUs The majority of the restricted shares and RSUs granted in 2017 and 2018 under the Plan vest ratably over a four -year period, with the first 25% of the grant vesting approximately one year after the date of grant, 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. A small portion of the restricted shares relate to a one-time 2018 grant, which vests 50% after a five -year period, with the remaining 50% vesting after a six -year period after the grant date, subject to continued employment through the vesting date. Dividend equivalents equal to dividends paid on our common shares during the vesting period are tracked and accumulated for each restricted share. The dividends equivalents 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, 2017 240,016 $ 19.00 Granted 215,212 26.81 Vested (59,281 ) 19.00 Forfeited (3,636 ) 20.60 Unvested at March 31, 2018 392,311 $ 23.27 Prior to our IPO, we granted restricted shares of Class B Common Stock. Shares included in the pre-IPO restricted share grants vest ratably over a three -year period. Cash dividends are not paid on the unvested pre-IPO restricted shares, nor do they accumulate during the vesting period. Pre-IPO Restricted Shares Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2017 152,199 $ 19.00 Granted — — Vested (101,643 ) 19.00 Forfeited — — Unvested at March 31, 2018 50,556 $ 19.00 Performance Shares and PSUs Performance shares and PSUs include a three -year performance period with vesting based on attainment of threshold performance of net income and return on capital targets. These awards cliff-vest at the end of the three year performance period, subject to continued employment through the vesting date or retirement eligibility, and payout ranges from 0% - 200% for PSUs and from 0% - 100% for performance 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 and are distributed to participants in cash consistent with the date the awards vest. Performance Shares and PSUs Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2017 391,541 $ 19.00 Granted 260,726 26.81 Vested — — Forfeited — — Unvested at March 31, 2018 652,267 $ 22.12 Nonqualified 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 four year period, 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. Nonqualified Stock Options Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2017 229,620 $ 6.37 Granted 145,368 8.95 Vested (57,405 ) 6.37 Forfeited — — Unvested at March 31, 2018 317,583 $ 7.55 Assumptions used in calculating the Black-Scholes value of options granted during 2018 were as follows: Three Months Ended March 31, 2018 Weighted-average Black-Scholes value $ 8.95 Black-Scholes Assumptions: Expected term 6.25 years Expected volatility 32.0 % Expected dividend yield 0.9 % Risk-free interest rate 2.8 %

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
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 on a number of matters, including liability claims, taxes other than income taxes, contract disputes, employment, and other litigation matters. We accrue for anticipated costs to defend and 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 financial statements. At March 31, 2018 , our firm commitments to purchase transportation equipment totaled approximately $217.4 million. WSL Acquisition The purchase and sale agreement related to our June 2016 acquisition of WSL included guaranteed payments of $20.0 million to the former owners of WSL on each of the first three anniversary dates of the closing. The liability recorded was discounted between one percent and three percent , based on credit-adjusted discount rates. The initial payment in the amount of $19.7 million, including calculated interest based on the discounted amount recorded, was made in June 2017 and reflected an adjustment for a working capital true-up. The total present value of the remaining two payments was $38.0 million at March 31, 2018 , which is recorded in other current and noncurrent liabilities on the Consolidated Balance Sheets. The representative of the former owners of WSL has claimed that we have not fulfilled certain obligations under the purchase and sale agreement relating to the post-closing operation of the business and that, as a result, the former owners are entitled to an accelerated payment of the contingent amount described in Note 3 , Fair Value , without regard to whether the specified earnings targets are met. We believe this claim is meritless and have filed an action in the Delaware Court of Chancery seeking a declaratory judgment that we have complied with our obligations under the agreement and that no accelerated payment is owed.

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2018
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. The chief operating decision maker reviews revenue for each segment upon delivery and 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, and in-transit revenue is not reflected in segment results. Income from operations at a segment level reflects the measures presented to the chief operating decision maker 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 reporting segments are eliminated in consolidation. The following tables summarize our segment information. Intersegment revenues were immaterial for all segments, with the exception of Other, which included revenues from insurance premiums charged to other segments for workers’ compensation, auto, and other types of insurance. Intersegment revenues included in Other revenues below were $20.7 million and $16.9 million for the three months ended March 31, 2018 and 2017 , respectively. Three Months Ended March 31, Revenues by Segment (in millions) 2018 2017 Truckload $ 551.3 $ 522.1 Intermodal 201.0 181.1 Logistics 220.8 183.9 Total revenues of reportable segments 973.1 887.1 Other 74.6 50.3 Fuel surcharge 117.8 90.2 Inter-segment eliminations (26.5 ) (21.2 ) Operating revenues $ 1,139.0 $ 1,006.4 Three Months Ended March 31, Income (Loss) from Operations by Segment (in millions) 2018 2017 Truckload $ 47.4 $ 38.5 Intermodal 21.8 6.6 Logistics 7.7 5.2 Other (9.3 ) (6.8 ) Income from operations $ 67.6 $ 43.5 Other expenses (income) $ 3.1 $ 5.6 Income before income taxes $ 64.5 $ 37.9 Three Months Ended March 31, Depreciation and Amortization Expense by Segment (in millions) 2018 2017 Truckload $ 52.5 $ 50.4 Intermodal 9.2 8.0 Logistics 0.1 0.1 Other 9.9 9.4 Depreciation and amortization expense $ 71.7 $ 67.9

General (Policies)

General (Policies)	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business In this report, when we refer to “the Company,” “us,” “we,” “our,” or “ours,” we are referring to Schneider National, Inc. and its subsidiaries. We are a leading transportation services organization headquartered in Green Bay, Wisconsin. We provide a broad portfolio of premier truckload, intermodal, and logistics solutions and operate one of the largest trucking fleets in North America.
Basis of Presentation	Basis of Presentation The accompanying unaudited interim Consolidated Financial Statements have been prepared in accordance with GAAP and the rules and regulations of the SEC applicable to quarterly reports on Form 10-Q. Therefore, these financial statements and footnotes do not include all disclosures required by GAAP for annual financial statements. These financial statements should be read in conjunction with the Consolidated Financial Statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2017. Financial results for an interim period are not necessarily indicative of the results for a full year. All intercompany transactions have been eliminated in consolidation. In the opinion of management, these statements reflect all adjustments (consisting only of normal recurring adjustments) necessary for the fair presentation of our financial results for the interim periods presented.
Accounting Standards Issued But Not Yet Adopted	Accounting Standards Issued But Not Yet Adopted In February 2016, the FASB issued ASU 2016-02, Leases , which requires lessees to recognize assets and liabilities in the consolidated balance sheets for leases with lease terms of more than 12 months. Consistent with current accounting principles, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, unlike current accounting principles, which require only capital leases to be recognized in the consolidated balance sheets, the new ASU will require both types of leases to be recognized in the consolidated balance sheets. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The modified retrospective approach includes a number of optional practical expedients that companies may elect to apply. These practical expedients relate to the identification and classification of leases that commenced before the effective date, initial direct costs for leases that commenced before the effective date, and the ability to use hindsight in evaluating lessee options to extend or terminate a lease or to purchase the underlying asset. The transition guidance also provides specific guidance for sale and leaseback transactions, build-to-suit leases, leveraged leases, and amounts previously recognized in accordance with the business combinations guidance for leases. The new standard is effective for us beginning with the reporting period ending March 31, 2019, with early adoption permitted. We expect an increase in our assets and liabilities from the recognition of operating leases on the consolidated balance sheets and are in the process of evaluating other potential impacts that the adoption of this ASU will have on our consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments , which requires companies to use a forward-looking, expected loss model to estimate credit losses on various types of financial assets and net investments in leases. It also requires additional disclosure related to credit quality of trade and other receivables, including information related to management’s estimate of credit allowances. This guidance is effective for us beginning with the reporting period ending March 31, 2020. We currently cannot reasonably estimate the impact that the adoption of this ASU will have on our consolidated financial statements.

Revenue Recognition Revenue R19

Revenue Recognition Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Summary of Impact of Adoption of Accounting Standards [Table Text Block]	The following table shows the amount by which financial statement lines were affected by the adoption of the new standard. The changes relate to the recognition of transportation revenue over time rather than at delivery, as explained below under the Transportation heading. Three Months Ended March 31, 2018 Financial Statement Line Item ( in millions ) Under ASC 605 Adjustment As Reported Consolidated Statement of Comprehensive Income Operating revenues $ 1,138.5 $ 0.5 $ 1,139.0 Purchased transportation 424.2 0.8 425.0 Salaries, wages, and benefits 311.0 0.3 311.3 Total operating expenses 1,070.3 1.1 1,071.4 Income from operations 68.2 (0.6 ) 67.6 Provision for income taxes 17.1 (0.2 ) 16.9 Net income 48.0 (0.4 ) 47.6 Comprehensive Income 47.4 (0.4 ) 47.0 Consolidated Balance Sheet Prepaid expenses and other current assets 95.4 19.6 115.0 Total current assets 1,173.4 19.6 1,193.0 Total assets 3,393.2 19.6 3,412.8 Other current liabilities 65.1 10.3 75.4 Total current liabilities 482.4 10.3 492.7 Deferred income taxes 400.6 2.4 403.0 Total noncurrent liabilities 983.3 2.4 985.7 Retained earnings 392.9 6.9 399.8 Total shareholders' equity 1,927.5 6.9 1,934.4 Total liabilities and shareholders' equity 3,393.2 19.6 3,412.8 Consolidated Statement of Cash Flows Operating Cash Flows Net income 48.0 (0.4 ) 47.6 Other noncash items (3.4 ) 0.6 (2.8 ) Change in: Payables 16.1 (0.2 ) 15.9
Disaggregation of Revenue [Table Text Block]	The following table breaks down our revenues by type of service, and each type of service is further described below. Three Months Ended March 31, (in millions) 2018 2017 Transportation $ 1,049.9 $ 935.5 Logistics management 52.1 52.3 Other 37.0 18.6 Total operating revenues $ 1,139.0 $ 1,006.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]	The following table provides information related to the transactions and expected timing of revenue recognition related to performance obligations that are fixed in nature and relate to contracts with terms greater than one year. Remaining Performance Obligations (in millions) March 31, 2018 Expected to be recognized within one year Transportation $ 15.7 Logistics Management 14.7 Expected to be recognized after one year Transportation 1.3 Logistics Management 5.5 Total $ 37.2
Contract with Customer, Asset and Liability [Table Text Block]	The following table provides information related to contract balances associated with our contracts with customers. Contract Balances ( in millions ) March 31, 2018 January 1, 2018 Other current assets - contract assets $ 22.8 $ 22.2 Other current liabilities - contract liabilities $ 8.3 $ —
Capitalized Contract Cost [Table Text Block]	The following table presents the amounts capitalized for contract fulfillment costs. (in millions) March 31, 2018 December 31, 2017 Capitalized contract fulfillment costs $ 4.4 $ 3.7
Amortization of Contract Fulfillment Costs [Table Text Block]	Amortization of capitalized contract fulfillment costs was as follows: Three Months Ended March 31, 2018 (in millions) 2018 2017 Amortization of contract fulfillment costs $ 0.6 $ 0.6

Fair Value Fair Value (Tables)

Fair Value Fair Value (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]	The table below presents the carrying value of our debt portfolio along with the fair value of a fixed-rate debt portfolio with similar terms and maturities, which is based on borrowing rates available to us in the applicable year. This valuation used Level 2 inputs. March 31, 2018 December 31, 2017 (in millions) Carrying Value Fair Value Carrying Value Fair Value Debt portfolio 423.8 418.1 429.8 432.4

Marketable Securities (Tables)

Marketable Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Investments Schedule [Abstract]
Schedule of Marketable Securities	The following table presents the values of our marketable securities as of the dates shown. March 31, 2018 December 31, 2017 (in millions) Amortized Cost Fair Value Amortized Cost Fair Value Zero coupon bonds $ 3.9 $ 3.8 $ 3.8 $ 3.9 U.S. treasury and government agencies 6.0 5.9 6.0 6.0 Asset-backed securities 0.1 0.2 0.3 0.3 Corporate debt securities 9.1 9.1 9.1 9.2 State and political subdivisions 21.7 21.3 22.7 22.2 Total marketable securities $ 40.8 $ 40.3 $ 41.9 $ 41.6

Goodwill and Other Intangible22

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Carrying Amount of Goodwill	Changes in the carrying amount of goodwill were as follows: (in millions) Truckload Logistics Other Total Balance at December 31, 2017 $ 138.2 $ 14.2 $ 12.4 $ 164.8 Foreign currency translation — — 0.5 0.5 Balance at March 31, 2018 $ 138.2 $ 14.2 $ 12.9 $ 165.3
Schedule of Identifiable Intangible Assets Other Than Goodwill	The identifiable intangible assets other than goodwill listed below are included in other noncurrent assets on the consolidated balance sheets. March 31, 2018 December 31, 2017 (in millions) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer lists $ 10.5 $ 2.7 $ 7.8 $ 10.5 $ 2.5 $ 8.0 Trade names 1.4 0.9 0.5 1.4 0.7 0.7 Total intangible assets $ 11.9 $ 3.6 $ 8.3 $ 11.9 $ 3.2 $ 8.7
Schedule Estimated Future Amortization Expense	Estimated future amortization expense related to intangible assets is as follows (in millions): Remaining 2018 $ 1.0 2019 1.1 2020 1.0 2021 1.0 2022 1.0 2023 and thereafter 3.2 $ 8.3

Debt and Credit Facilities (Tab

Debt and Credit Facilities (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Summary of Debt	As of March 31, 2018 and December 31, 2017 , debt included the following: (in millions) March 31, December 31, Unsecured senior notes: principal payable at maturities ranging from 2019 through 2025; interest payable in semiannual installments through the same timeframe; weighted-average interest rate of 3.36% for both 2018 and 2017 $ 400.0 $ 400.0 Equipment financing notes: principal and interest payable in monthly installments through 2023; weighted average interest rate of 3.74% and 3.76% for 2018 and 2017, respectively 23.8 29.8 Total principal outstanding 423.8 429.8 Current maturities (12.2 ) (15.2 ) Debt issuance costs (0.8 ) (0.9 ) Long-term debt $ 410.8 $ 413.7

Lease Receivables (Tables)

Lease Receivables (Tables)	3 Months Ended
	Mar. 31, 2018
Leases [Abstract]
Summary of Investment in Lease Receivables	As of March 31, 2018 and December 31, 2017 , the investment in lease receivables was as follows: (in millions) March 31, 2018 December 31, 2017 Future minimum payments to be received on leases $ 141.2 $ 141.2 Guaranteed residual lease values 136.0 130.7 Total minimum lease payments to be received 277.2 271.9 Unearned income (28.1 ) (28.1 ) Net investment in leases 249.1 243.8 Current maturities of lease receivables 117.7 106.6 Less—allowance for doubtful accounts (2.1 ) (1.7 ) Current portion of lease receivables—net of allowance 115.6 104.9 Lease receivables—noncurrent $ 133.5 $ 138.9

Common Equity (Tables)

Common Equity (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Calculation of Basic and Diluted Earnings Per Share	Three Months Ended March 31, (in millions, except per share data) 2018 2017 Basic earnings per common share: Net income available to common shareholders $ 47.6 $ 22.6 Weighted average common shares issued and outstanding 176.9 156.4 Basic earnings per common share $ 0.27 $ 0.14 Diluted earnings per common share: Net income applicable to diluted earnings per common share $ 47.6 $ 22.6 Dilutive potential common shares: Restricted share units 0.3 0.4 Dilutive potential common shares 0.3 0.4 Total diluted average common shares issued and outstanding 177.2 156.8 Diluted earnings per common share $ 0.27 $ 0.14

Share-based Compensation (Table

Share-based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	The following table summarizes the components of our share-based compensation program expense: Three Months Ended March 31, (in millions) 2018 2017 Restricted Shares and RSUs 0.6 — Pre-IPO Restricted Shares 0.5 0.6 Performance Shares and PSUs 0.6 — Nonqualified Stock Options 0.3 — Share-based compensation expense 2.0 0.6 Related tax benefit 0.5 0.2
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	Restricted Shares and RSUs Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2017 240,016 $ 19.00 Granted 215,212 26.81 Vested (59,281 ) 19.00 Forfeited (3,636 ) 20.60 Unvested at March 31, 2018 392,311 $ 23.27 Prior to our IPO, we granted restricted shares of Class B Common Stock. Shares included in the pre-IPO restricted share grants vest ratably over a three -year period. Cash dividends are not paid on the unvested pre-IPO restricted shares, nor do they accumulate during the vesting period. Pre-IPO Restricted Shares Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2017 152,199 $ 19.00 Granted — — Vested (101,643 ) 19.00 Forfeited — — Unvested at March 31, 2018 50,556 $ 19.00
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]	Performance Shares and PSUs Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2017 391,541 $ 19.00 Granted 260,726 26.81 Vested — — Forfeited — — Unvested at March 31, 2018 652,267 $ 22.12
Share-based Compensation, Stock Options, Activity [Table Text Block]	Nonqualified Stock Options Number of Awards Weighted Average Grant Date Fair Value Unvested at December 31, 2017 229,620 $ 6.37 Granted 145,368 8.95 Vested (57,405 ) 6.37 Forfeited — — Unvested at March 31, 2018 317,583 $ 7.55
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Assumptions used in calculating the Black-Scholes value of options granted during 2018 were as follows: Three Months Ended March 31, 2018 Weighted-average Black-Scholes value $ 8.95 Black-Scholes Assumptions: Expected term 6.25 years Expected volatility 32.0 % Expected dividend yield 0.9 % Risk-free interest rate 2.8 %

Share-based Compensation Compon

Share-based Compensation Components of Share-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	$ 2	$ 0.6
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	0.5	0.2
Restricted Shares And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	0.6	0
Performance Shares And Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	0.6	0
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	0.3	0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	$ 0.5	$ 0.6

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Summary of Segment Reporting Information	The following tables summarize our segment information. Intersegment revenues were immaterial for all segments, with the exception of Other, which included revenues from insurance premiums charged to other segments for workers’ compensation, auto, and other types of insurance. Intersegment revenues included in Other revenues below were $20.7 million and $16.9 million for the three months ended March 31, 2018 and 2017 , respectively. Three Months Ended March 31, Revenues by Segment (in millions) 2018 2017 Truckload $ 551.3 $ 522.1 Intermodal 201.0 181.1 Logistics 220.8 183.9 Total revenues of reportable segments 973.1 887.1 Other 74.6 50.3 Fuel surcharge 117.8 90.2 Inter-segment eliminations (26.5 ) (21.2 ) Operating revenues $ 1,139.0 $ 1,006.4 Three Months Ended March 31, Income (Loss) from Operations by Segment (in millions) 2018 2017 Truckload $ 47.4 $ 38.5 Intermodal 21.8 6.6 Logistics 7.7 5.2 Other (9.3 ) (6.8 ) Income from operations $ 67.6 $ 43.5 Other expenses (income) $ 3.1 $ 5.6 Income before income taxes $ 64.5 $ 37.9 Three Months Ended March 31, Depreciation and Amortization Expense by Segment (in millions) 2018 2017 Truckload $ 52.5 $ 50.4 Intermodal 9.2 8.0 Logistics 0.1 0.1 Other 9.9 9.4 Depreciation and amortization expense $ 71.7 $ 67.9

General - Additional Informatio

General - Additional Information (Details) - Class B Common Stock - IPO $ / shares in Units, $ in Millions	1 Months Ended
	May 31, 2017USD ($)$ / sharesshares
Class of Stock [Line Items]
Share issued during the period (shares) | shares	20,145,000
Share issued, (price per share) | $ / shares	$ 19
Proceeds from IPO, net of issuance costs	$ 382.7
Proceeds from IPO, net of issuance costs	0
Expenses related to the offering	$ 42.1

Revenue Recognition Summary of

Revenue Recognition Summary of Impact of Adoption of Accounting Standards (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Item Effected [Line Items]
Operating revenues	$ 1,139	$ 1,006.4
Purchased transportation	425	367.3
Salaries, wages, and benefits	311.3	297.7
Total operating expenses	1,071.4	962.9
Income from operations	67.6	43.5
Provision for income taxes	16.9	15.3
Net income	47.6	22.6
Comprehensive Income	47	22.6
Prepaid expenses and other current assets	115		$ 75.6
Total current assets	1,193		1,094
Total assets	3,412.8		3,330.5
Other current liabilities	75.4		69.6
Total current liabilities	492.7		462
Deferred income taxes	403		386.6
Total noncurrent liabilities	985.7		978.3
Retained earnings	399.8		355.6
Total shareholders' equity	1,934.4		1,890.2
Total liabilities and shareholders' equity	3,412.8		3,330.5
Other noncash items	2.8	0.1
Change in: Payables	15.9	$ 10.1
Balances under ASC 605 [Member]
Item Effected [Line Items]
Operating revenues	1,138.5
Purchased transportation	424.2
Salaries, wages, and benefits	311
Total operating expenses	1,070.3
Income from operations	68.2
Provision for income taxes	17.1
Net income	48
Comprehensive Income	47.4
Prepaid expenses and other current assets	95.4
Total current assets	1,173.4
Total assets	3,393.2
Other current liabilities	65.1
Total current liabilities			482.4
Deferred income taxes			400.6
Total noncurrent liabilities	983.3
Retained earnings			392.9
Total shareholders' equity	1,927.5
Total liabilities and shareholders' equity	3,393.2
Other noncash items	3.4
Change in: Payables	16.1
Effect on line items of ASC 606 [Member]
Item Effected [Line Items]
Operating revenues	0.5
Purchased transportation	0.8
Salaries, wages, and benefits	0.3
Total operating expenses	1.1
Income from operations	(0.6)
Provision for income taxes	(0.2)
Net income	(0.4)
Prepaid expenses and other current assets	19.6
Total current assets	19.6
Total assets	19.6
Other current liabilities	10.3
Total current liabilities			10.3
Deferred income taxes			2.4
Total noncurrent liabilities	2.4
Retained earnings			$ 6.9
Total shareholders' equity	6.9
Total liabilities and shareholders' equity	19.6
Other noncash items	0.6
Change in: Payables	$ (0.2)

Revenue Recognition Disaggregat

Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
OPERATING REVENUES	$ 1,139	$ 1,006.4
Transportation [Member]
Disaggregation of Revenue [Line Items]
OPERATING REVENUES	1,049.9	935.5
Logistics Management [Member]
Disaggregation of Revenue [Line Items]
OPERATING REVENUES	52.1	52.3
Other [Member]
Disaggregation of Revenue [Line Items]
OPERATING REVENUES	$ 37	$ 18.6

Revenue Recognition Revenue, Re

Revenue Recognition Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction (Details) $ in Millions	Mar. 31, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 37.2
Expected to be recongized within one year [Member] | Transportation [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	15.7
Expected to be recongized within one year [Member] | Logistics Management [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	14.7
Expected to be recognized after one year [Member] | Transportation [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	1.3
Expected to be recognized after one year [Member] | Logistics Management [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 5.5

Revenue Recognition Contract wi

Revenue Recognition Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	Mar. 31, 2018	Jan. 01, 2018
Contract Balances [Line Items]
Contract with Customer, Asset, Net	$ 22.8	$ 22.2
Contract with Customer, Liability	$ 8.3	$ 0

Revenue Recognition Capitalized

Revenue Recognition Capitalized Contract Cost (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost	$ 4.4	$ 3.7

Revenue Recognition Amortizatio

Revenue Recognition Amortization of Contract Fulfillment Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Capitalized Contract Cost, Amortization [Line Items]
Capitalized Contract Cost, Amortization	$ 0.6	$ 0.6

Revenue Recognition Initial App

Revenue Recognition Initial Application Period Cumulative Effect Adjustment (Details) $ in Millions	Jan. 01, 2018USD ($)
Initial Application Period Cumulative Translation Adjustment [Abstract]
Cumulative Effect on Retained Earnings, Net of Tax	$ 7.3

Fair Value Fair Value - Additio

Fair Value Fair Value - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Transfers Between Levels Transfers Amount	$ 0
Fair Value, Inputs, Level 3 [Member] | Watkins and Shepard Trucking Inc [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Business Combination, Contingent Consideration, Liability, Fair Value	$ 0	$ 40,000,000

Fair Value Fair value of debt p

Fair Value Fair value of debt portfolio (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount	$ 423.8	$ 429.8
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount	$ 418.1	$ 432.4

Marketable Securities - Additio

Marketable Securities - Additional Information (Details)	3 Months Ended
	Mar. 31, 2018
Minimum
Schedule of Available-for-sale Securities [Line Items]
Marketable securities maturity term	1 month
Maximum
Schedule of Available-for-sale Securities [Line Items]
Marketable securities maturity term	80 months

Marketable Securities - Schedul

Marketable Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 40.8	$ 41.9
Fair Value	40.3	41.6
Current Asset | Zero coupon bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3.9	3.8
Fair Value	3.8	3.9
Current Asset | U.S. treasury and government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6	6
Fair Value	5.9	6
Current Asset | Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0.1	0.3
Fair Value	0.2	0.3
Current Asset | Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9.1	9.1
Fair Value	9.1	9.2
Current Asset | State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21.7	22.7
Fair Value	$ 21.3	$ 22.2

Goodwill and Other Intangible41

Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Goodwill
Beginning balance	$ 164.8
Foreign currency translation	0.5
Ending balance	165.3
Truckload
Goodwill
Beginning balance	138.2
Foreign currency translation	0
Ending balance	138.2
Logistics
Goodwill
Beginning balance	14.2
Foreign currency translation	0
Ending balance	14.2
Other
Goodwill
Beginning balance	12.4
Foreign currency translation	0.5
Ending balance	$ 12.9

Goodwill and Other Intangible42

Goodwill and Other Intangible Assets - Schedule of Identifiable Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	$ 8.3
Other Noncurrent Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11.9	$ 11.9
Accumulated Amortization	3.6	3.2
Net Carrying Amount	8.3	8.7
Other Noncurrent Assets | Customer lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10.5	10.5
Accumulated Amortization	2.7	2.5
Net Carrying Amount	7.8	8
Other Noncurrent Assets | Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1.4	1.4
Accumulated Amortization	0.9	0.7
Net Carrying Amount	$ 0.5	$ 0.7

Goodwill and Other Intangible43

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$ 0.4	$ 0.4
Goodwill, Impaired, Accumulated Impairment Loss	$ 6

Goodwill and Other Intangible44

Goodwill and Other Intangible Assets - Schedule Estimated Future Amortization Expense (Details) $ in Millions	Mar. 31, 2018USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule
Remaining 2,018	$ 1
2,018	1.1
2,019	1
2,020	1
2,021	1
2023 and thereafter	3.2
Net Carrying Amount	$ 8.3

Debt and Credit Facilities - Su

Debt and Credit Facilities - Summary of Debt (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total principal outstanding	$ 423.8	$ 429.8
Current maturities	(12.2)	(15.2)
Debt issuance costs	(0.8)	(0.9)
Long-term debt	410.8	413.7
Unsecured Senior Notes
Debt Instrument [Line Items]
Total principal outstanding	$ 400	$ 400
Maturity year	2,025
Weighted-average interest rate	3.36%	3.36%
Equipment Financing Notes
Debt Instrument [Line Items]
Total principal outstanding	$ 23.8	$ 29.8
Maturity year	2,023
Weighted-average interest rate	3.74%	3.76%

Debt and Credit Facilities - Ad

Debt and Credit Facilities - Additional Information (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total principal outstanding	$ 423,800,000	$ 429,800,000
Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Credit facility, Outstanding borrowings	0	0
Revolving Credit Agreement [Member] | Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Credit facility, Standby letters of credit	3,900,000	3,900,000
Secured Credit Facility
Debt Instrument [Line Items]
Credit facility, Maximum borrowing capacity against qualifying trade receivables	0
Secured Credit Facility | Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Credit facility, Standby letters of credit	$ 63,300,000	$ 63,800,000

Lease Receivables - Summary of

Lease Receivables - Summary of Investment in Lease Receivables (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Future minimum payments to be received on leases	$ 141.2	$ 141.2
Guaranteed residual lease values	136	130.7
Total minimum lease payments to be received	277.2	271.9
Unearned income	(28.1)	(28.1)
Net investment in leases	249.1	243.8
Current maturities of lease receivables	117.7	106.6
Less—allowance for doubtful accounts	(2.1)	(1.7)
Current portion of lease receivables—net of allowance	115.6	104.9
Lease receivables—noncurrent	$ 133.5	$ 138.9

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	26.20%	40.50%

Common Equity - Calculation of

Common Equity - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic earnings per common share:
Net income available to common shareholders	$ 47.6	$ 22.6
Weighted average common shares outstanding (shares)	176.9	156.4
Basic earnings (usd per share)	$ 0.27	$ 0.14
Diluted earnings per common share:
Net income applicable to diluted earnings per common share	$ 47.6	$ 22.6
Dilutive potential common shares:
Restricted share units (shares)	0.3	0.4
Dilutive potential common shares (shares)	0.3	0.4
Total diluted average common shares issued and outstanding (shares)	177.2	156.8
Diluted earnings (usd per share)	$ 0.27	$ 0.14

Common Equity - Additional Info

Common Equity - Additional Information (Details) - $ / shares	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Mar. 31, 2017
Class of Stock [Line Items]
Dividends declared per share (usd per share)		$ 0.06	$ 0.05
Subsequent Event | Class A Common Shares
Class of Stock [Line Items]
Dividends declared per share (usd per share)	$ 0.06

Share-based Compensation Restri

Share-based Compensation Restricted Shares and RSUs (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Restricted Shares And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 23.27	$ 19
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	26.81
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	19
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 20.60
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	215,212
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(59,281)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	392,311	240,016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(3,636)
Share-based Compensation Award, Tranche One [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Share-based Compensation Award, Tranche One [Member] | Restricted Shares And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Share-based Compensation Award, Tranche Two [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	6 years
Pre-IPO Share-Based Compensation Plan [Member] | Restricted Shares And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 19	$ 19
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	19
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(101,643)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	50,556	152,199
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0

Share-based Compensation Perfor

Share-based Compensation Performance Shares and PSUs (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Performance Shares And Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	260,726
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	652,267	391,541
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 26.81
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 22.12	$ 19
PSU [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement By Share-based Payment Award, Payout Range, Percentage	200.00%
Performance Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement By Share-based Payment Award, Payout Range, Percentage	0.00%
Performance Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement By Share-based Payment Award, Payout Range, Percentage	100.00%

Share-based Compensation Nonqua

Share-based Compensation Nonqualified Stock Options (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	145,368
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares	(57,405)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	317,583	229,620
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value	$ 7.55	$ 6.37
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	8.95
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value	$ 6.37
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value	$ 0
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 8.95
Employee Stock Option [Member] | Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%

Share-based Compensation Stock

Share-based Compensation Stock Option Valuation Assumptions (Details)	3 Months Ended
	Mar. 31, 2018$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price	$ 8.95
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price	$ 8.95
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years 3 months
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	32.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.80%

Share-based Compensation Additi

Share-based Compensation Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 17.6
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 9 months

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended
	Jun. 30, 2017	Mar. 31, 2018
Business Acquisition [Line Items]
Commitments to purchase transportation equipment		$ 217,400,000
WSL
Business Acquisition [Line Items]
Initial guaranteed payment	$ 0
Business Combination Consideration Transferred Guaranteed Payment		38,000,000
Former Owner [Member]
Business Acquisition [Line Items]
Cash payments		$ 20,000,000
Former Owner [Member] | Minimum
Business Acquisition [Line Items]
Business Acquisition Contingent Consideration Discounted Cash Flow Discount Rate		1.00%
Former Owner [Member] | Maximum [Member]
Business Acquisition [Line Items]
Business Acquisition Contingent Consideration Discounted Cash Flow Discount Rate		3.00%

Segment Reporting - Additional

Segment Reporting - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)Segment	Mar. 31, 2017USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3
Operating revenues	$ 1,139	$ 1,006.4
Other
Segment Reporting Information [Line Items]
Operating revenues	74.6	50.3
Other | Other Insurance
Segment Reporting Information [Line Items]
Operating revenues	$ 20.7	$ 16.9

Segment Reporting - Revenue by

Segment Reporting - Revenue by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Operating revenues	$ 1,139	$ 1,006.4
Revenues excluding fuel surcharge	973.1	887.1
Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(26.5)	(21.2)
Truckload
Segment Reporting Information [Line Items]
Revenues excluding fuel surcharge	551.3	522.1
Intermodal
Segment Reporting Information [Line Items]
Revenues excluding fuel surcharge	201	181.1
Logistics
Segment Reporting Information [Line Items]
Revenues excluding fuel surcharge	220.8	183.9
Other
Segment Reporting Information [Line Items]
Operating revenues	74.6	50.3
Fuel Surcharge
Segment Reporting Information [Line Items]
Operating revenues	$ 117.8	$ 90.2

Segment Reporting - Income From

Segment Reporting - Income From Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Income from operations	$ 67.6	$ 43.5
Nonoperating Income (Expense)	(3.1)	(5.6)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	64.5	37.9
Truckload
Segment Reporting Information [Line Items]
Income from operations	47.4	38.5
Intermodal
Segment Reporting Information [Line Items]
Income from operations	21.8	6.6
Logistics
Segment Reporting Information [Line Items]
Income from operations	7.7	5.2
Other
Segment Reporting Information [Line Items]
Income from operations	$ (9.3)	$ (6.8)

Segment Reporting - Depreciatio

Segment Reporting - Depreciation and Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Depreciation and amortization expense	$ 71.7	$ 67.9
Truckload
Segment Reporting Information [Line Items]
Depreciation and amortization expense	52.5	50.4
Intermodal
Segment Reporting Information [Line Items]
Depreciation and amortization expense	9.2	8
Logistics
Segment Reporting Information [Line Items]
Depreciation and amortization expense	0.1	0.1
Other
Segment Reporting Information [Line Items]
Depreciation and amortization expense	$ 9.9	$ 9.4