ASGN (ASGN) 10-Q 10 Aug 20 2020 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares shares in Millions	6 Months Ended
	Jun. 30, 2020	Aug. 03, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	001-35636
Entity Registrant Name	ASGN Inc
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-4023433
Entity Address, Address Description	4400 Cox Road, Suite 110
Entity Address, City or Town	Glen Allen
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	23060
City Area Code	888
Local Phone Number	482-8068
Title of 12(b) Security	Common Stock
Trading Symbol	ASGN
Security Exchange Name	NYSE
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		52.5
Entity Central Index Key	0000890564
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 207.9	$ 95.2
Accounts receivable, net	612.1	648.7
Prepaid expenses and income taxes	15.9	29.4
Other current assets	18.7	18.2
Total current assets	854.6	791.5
Property and equipment, net	79.2	73.7
Operating lease right of use assets	90.3	94.6
Identifiable intangible assets, net	474.6	476.5
Goodwill	1,547.3	1,486.9
Other non-current assets	19.5	18.2
Total assets	3,065.5	2,941.4
Current liabilities:
Accounts payable	37.5	39.2
Accrued payroll and contract professional pay	206.5	203.2
Operating lease liabilities	27.6	25.8
Other current liabilities	85.7	72.7
Total current liabilities	357.3	340.9
Long-term debt	1,032.9	1,032.3
Operating lease liabilities	69.5	75.7
Deferred income tax liabilities	98.6	98.7
Other long-term liabilities	50.1	17.6
Total liabilities	1,608.4	1,565.2
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred Stock, Value, $0.01 par value	0	0
Common stock, $0.01 par value	0.5	0.5
Paid-in capital	645.9	638
Retained earnings	818.6	744.7
Accumulated other comprehensive loss	(7.9)	(7)
Total stockholders’ equity	1,457.1	1,376.2
Total liabilities and stockholders’ equity	$ 3,065.5	$ 2,941.4

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares shares in Millions, $ / shares in Millions	Jun. 30, 2020	Dec. 31, 2019
Stockholders’ equity:
Preferred Stock, par value (in dollars per share)	$ 0	$ 0
Preferred Stock, shares authorized (in shares)	1	1
Preferred Stock, shares issued (in shares)	0	0
Preferred Stock, shares outstanding (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0	$ 0
Common Stock, shares authorized (in shares)	75	75
Common Stock, Shares	52.5	52.9
Common Stock: shares outstanding (in shares)	52.5	52.9

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 936.8	$ 972.3	$ 1,927.3	$ 1,896
Cost of services	676	687.1	1,385.6	1,346.9
Gross profit	260.8	285.2	541.7	549.1
Selling, general and administrative expenses	172.2	198.8	370.1	386.2
Amortization of intangible assets	12.6	13.1	24.7	26.9
Operating income	76	73.3	146.9	136
Interest expense	(9.7)	(14)	(21.1)	(28.5)
Income before income taxes	66.3	59.3	125.8	107.5
Provision for income taxes	17.5	16.2	33.2	29.5
Net income	$ 48.8	$ 43.1	$ 92.6	$ 78
Earnings per share:
Basic	$ 0.93	$ 0.82	$ 1.76	$ 1.48
Diluted	$ 0.92	$ 0.81	$ 1.74	$ 1.46
Number of shares and share equivalents used to calculate earnings per share:
Basic	52.5	52.8	52.7	52.7
Diluted	53	53.4	53.1	53.3
Reconciliation of net income to comprehensive income:
Net income	$ 48.8	$ 43.1	$ 92.6	$ 78
Foreign currency translation adjustment	1.6	1	(0.9)	(0.1)
Comprehensive income	$ 50.4	$ 44.1	$ 91.7	$ 77.9

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Shares Outstanding at Dec. 31, 2018		52.5
Total stockholders’ equity at Dec. 31, 2018	$ 1,182.1	$ 0.5	$ 601.8	$ 586.1	$ (6.3)
Vesting of restricted stock units, shares		0.2
Vesting of restricted stock units, value	(6.8)		(6.8)
Employee stock purchase plan, shares		0.1
Employee stock purchase plan, value	6.9		6.9
Stock Issued During Period, Value, Stock Options Exercised	23.6
Stock-based compensation expense			23.6
Stock Repurchased and Retired During Period, Value	(0.1)
Foreign currency translation adjustments	78				(0.1)
Net income	78			78
Shares Outstanding at Jun. 30, 2019		52.8
Total stockholders’ equity at Jun. 30, 2019	1,283.7	$ 0.5	625.5	664.1	(6.4)
Shares Outstanding at Mar. 31, 2019		52.8
Total stockholders’ equity at Mar. 31, 2019	1,227.3	$ 0.5	613.2	621	(7.4)
Vesting of restricted stock units, shares		0
Vesting of restricted stock units, value	(1.3)		(1.3)
Stock-based compensation expense	13.6		13.6
Foreign currency translation adjustments	1				1
Net income	43.1			43.1
Shares Outstanding at Jun. 30, 2019		52.8
Total stockholders’ equity at Jun. 30, 2019	1,283.7	$ 0.5	625.5	664.1	(6.4)
Shares Outstanding at Dec. 31, 2019		52.9
Total stockholders’ equity at Dec. 31, 2019	1,376.2	$ 0.5	638	744.7	(7)
Vesting of restricted stock units, shares		0.2
Vesting of restricted stock units, value	(5.9)		(5.9)
Employee stock purchase plan, shares		0.2
Employee stock purchase plan, value	5.9		5.9
Stock Issued During Period, Value, Stock Options Exercised	17.1
Stock-based compensation expense	$ (27.9)		17.1
Stock Repurchased and Retired During Period, Shares	(0.8)
Stock Repurchased and Retired During Period, Value	$ (0.9)		(9.2)	(18.7)
Foreign currency translation adjustments	92.6				(0.9)
Net income	92.6			92.6
Shares Outstanding at Jun. 30, 2020		52.5
Total stockholders’ equity at Jun. 30, 2020	1,457.1	$ 0.5	645.9	818.6	(7.9)
Shares Outstanding at Mar. 31, 2020		52.4
Total stockholders’ equity at Mar. 31, 2020	1,399.5	$ 0.5	638.7	769.8	(9.5)
Vesting of restricted stock units, shares		0.1
Vesting of restricted stock units, value	(1)		(1)
Stock-based compensation expense	8.2		8.2
Foreign currency translation adjustments	1.6				1.6
Net income	48.8			48.8
Shares Outstanding at Jun. 30, 2020		52.5
Total stockholders’ equity at Jun. 30, 2020	$ 1,457.1	$ 0.5	$ 645.9	$ 818.6	$ (7.9)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows from Operating Activities:
Net income	$ 92.6	$ 78
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	43	46.6
Stock-based compensation	16.9	23.3
Other	3.5	8.5
Changes in operating assets and liabilities:
Accounts receivable	40.5	1
Prepaid expenses and income taxes	13.5	(5.3)
Accounts payable	(0.2)	(21)
Accrued payroll and contract professional pay	(0.1)	0.5
Income taxes payable	16.7	10
Operating lease right of use assets	14.4	13.9
Operating lease liabilities	(14.6)	(13.7)
Other	24	(1.3)
Net Cash Provided by Operating Activities	250.2	140.5
Cash Flows from Investing Activities:
Cash paid for property and equipment	(22.6)	(15.9)
Cash paid for acquisitions, net of cash acquired	(85.5)	(48.5)
Other	(0.3)	(0.9)
Net cash used in investing activities	(108.4)	(65.3)
Cash Flows from Financing Activities:
Proceeds from long-term debt	65.5	50
Principal payments of long-term debt	(65.5)	(127)
Payments of Debt Issuance Costs	(1.3)	0
Proceeds from option exercises and employee stock purchase plan	5.9	6.9
Payment of employment taxes related to release of restricted stock awards	(5.9)	(6.8)
Payments for Repurchase of Common Stock	(27.9)	0
Net Cash provided by (used in) Financing Activities	(29.2)	(76.9)
Effect of exchange rate changes on cash and cash equivalents	0.1	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	112.7	(1.7)
Cash and Cash Equivalents at Beginning of Year	95.2	41.8
Cash and Cash Equivalents at End of Period	207.9	40.1
Supplemental Disclosure of Cash Flow Information:
Income taxes	5.3	21
Interest	19.7	25.4
Supplemental Disclosure of Non-Cash Transactions:
Unpaid portion of additions to property and equipment	4.2	1.1
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 10.4	$ 7.6

Financial Statement Presentatio

Financial Statement Presentation (Notes)	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Statement Presentation	1. General Basis of presentation — The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") and the rules of the Securities and Exchange Commission (the "SEC"). Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations. The December 31, 2019 condensed consolidated balance sheet was derived from audited financial statements. The financial statements include adjustments consisting of normal recurring items, which, in the opinion of management, are necessary for a fair presentation of the financial position of ASGN Incorporated and its subsidiaries ("ASGN" or the "Company") and its results of operations for the interim dates and periods set forth herein. The results for any of the interim periods are not necessarily indicative of the results to be expected for the full year or any other period. This Quarterly Report on Form 10-Q should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2019 ("2019 10-K"). COVID-19 pandemic — As a result of the COVID-19 pandemic, the Company experienced a precipitous decline in revenues from its creative marketing and permanent placement divisions in the second quarter of 2020. In the aggregate, these divisions accounted for approximately 8.9 percent of consolidated revenues for the quarter. Due to this decline and the uncertainty related to future performance, the Company performed an assessment of the goodwill and trademarks of these divisions. This assessment included sensitivity analyses and stress testing on certain of our more sensitive inputs to our valuation models, including the weighted-average cost of capital and future expected revenues. Based on this assessment, we concluded that their fair values, more likely than not, exceeded their carrying values. Given the uncertainty of the current economic environment, accounting estimates and assumptions that require management's judgments concerning the effects of the economic downturn and recovery, particularly those relating to the recoverability of intangible assets and goodwill, are being closely monitored. As allowed by the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”), the Company deferred the payment of certain federal payroll taxes. This relief program is applicable for wages paid through December 31, 2020 and requires 50 percent of the amounts deferred to be paid by December 31, 2021 with the remaining amount paid by December 31, 2022. This deferral, which totaled $31.1 million

Accounting Standard Update (Not

Accounting Standard Update (Notes)	6 Months Ended
	Jun. 30, 2020
Accounting Standard Update [Abstract]
New Accounting Pronouncements	2. Accounting Standards Update On January 1, 2020, the Company adopted Accounting Standard Update ("ASU") No. 2016-13, Financial Instruments - Credit Losses (Topic 326). This standard requires a financial asset to be presented at the net amount expected to be collected. The financial assets of the Company in scope of ASU 2016-13 were primarily accounts receivable. The adoption of this standard did not have a significant impact to the Company's consolidated financial statements. The Company estimates an allowance for expected credit losses on accounts receivable that result from the inability of customers to make required payments. These estimates are based on a combination of historical loss statistics, current business conditions and macro-economic trends. In estimating the allowance for expected credit losses, consideration is given to the current aging of receivables and a specific review for potential bad debts. The resulting bad debt expense is included in selling, general and administrative expenses in the consolidated statements of operations and comprehensive income. Receivables are written-off when deemed uncollectible. The Company evaluates the adequacy of its allowance for credit losses on accounts receivable on a regular basis. The accounts receivable allowance was $5.7 million and $5.1 million at June 30, 2020 and December 31, 2019 , respectively, and the activity in the six months ended June 30, 2020 was not material. On January 1, 2020, the Company adopted ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract . This update provides guidance regarding the capitalization of implementation costs incurred in a cloud computing arrangement that is a service contract. ASU 2018-15 was adopted prospectively and cloud computing implementation costs incurred on January 1, 2020 or later are included in other noncurrent assets in the consolidated balance sheet and are presented within operating cash flows. As of June 30, 2020 , $2.0 million of capitalized implementation costs were included in other noncurrent assets, and there was an insignificant amount of amortization expense recorded during the six and three months ended June 30, 2020. Effective January 1, 2020, the Company adopted ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350) Simplifying the Test for Goodwill Impairment. This guidance eliminates Step 2 of the goodwill impairment test and goodwill impairment will now be measured as the amount by which a reporting unit’s carrying amount exceeds its fair value. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements. In March 2020, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2020-04 Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting. ASU 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases and other contracts. This guidance is optional and may be elected over time as reference rate reform activities occur. The Company is currently evaluating the impact of this guidance.

Leases (Notes)

Leases (Notes)	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Leases Disclosure	7. Leases The Company has operating leases for corporate offices, branch offices and data centers. Two of these properties were owned indirectly by certain board members and an executive of the Company. Related-party rent expense for these properties was $0.2 million and $0.4 million for the three and six months ended June 30, 2020 , respectively; and $0.3 million and $0.6 million for the three and six months ended June 30, 2019

Acquisitions (Notes)

Acquisitions (Notes)	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Acquisitions	3. Acquisitions Blackstone Federal Acquisition On January 24, 2020 , the Company acquired certain specified assets and liabilities that make up the federal division of Blackstone Technology Group (“Blackstone Federal”), for $85.5 million in cash. Blackstone Federal is headquartered in Arlington, Virginia . The acquisition expands the Company's capabilities in agile application development, cloud modernization and systems architecture, cybersecurity, user experience design and branding services to government clients and is part of the ECS Segment. The results of operations of Blackstone Federal are included in the consolidated results of the Company from the date of its acquisition. The Company does not provide pro forma information for the Blackstone Federal acquisition due to its size. The purchase accounting for the acquisition of Blackstone Federal remains incomplete with respect to the provisional fair value of assets acquired and liabilities assumed, as management continues to gather and evaluate information about circumstances that existed as of the acquisition date. Measurement period adjustments will be recognized prospectively within 12 months from the date of acquisition. Goodwill associated with this acquisition totaled $61.1 million , which is deductible for income tax purposes. Goodwill represents the acquired assembled workforce, potential new customers and future cash flows after the acquisition. Identifiable intangible assets related to this acquisition totaled $22.8 million , with useful lives ranging from one to nine years. Intersys Acquisition On October 17, 2019, the Company acquired all of the membership interests of Intersys Consulting, LLC ("Intersys"), headquartered in Austin, Texas , for $67.0 million in cash. The acquisition expands the Company's capabilities in digital innovation and enterprise solutions and it is part of the Apex Segment. The results of operations of Intersys are included in the consolidated results of the Company from the date of its acquisition. The Company does not provide pro forma information for the Intersys acquisition due to its size. The purchase accounting for the acquisition of Intersys remains incomplete with respect to the provisional fair value of assets acquired and liabilities assumed, as management continues to gather and evaluate information about circumstances that existed as of the acquisition date. Measurement period adjustments will be recognized prospectively within 12 months from the date of acquisition. Goodwill associated with this acquisition totaled $41.4 million , of which $38.7 million is deductible for income tax purposes. Goodwill represents the acquired assembled workforce, potential new customers and future cash flows after the acquisition. Identifiable intangible assets related to this acquisition totaled $23.8 million

Goodwill and Identifiable Asset

Goodwill and Identifiable Assets (Notes)	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Identifiable Intangible Assets	4. Goodwill and Identifiable Intangible Assets The changes in the carrying amount of goodwill by segment for the six months ended June 30, 2020 and the year ended December 31, 2019 were as follows (in millions): Apex Oxford ECS Total Balance as of December 31, 2018 $ 662.1 $ 230.8 $ 528.2 $ 1,421.1 DHA acquisition — — 24.7 24.7 Intersys acquisition 41.4 — — 41.4 Translation adjustment — (0.3 ) — (0.3 ) Balance as of December 31, 2019 703.5 230.5 552.9 1,486.9 Blackstone Federal acquisition — — 61.1 61.1 Translation adjustment (0.5 ) (0.2 ) — (0.7 ) Balance as of June 30, 2020 $ 703.0 $ 230.3 $ 614.0 $ 1,547.3 Acquired intangible assets consisted of the following (in millions): June 30, 2020 December 31, 2019 Estimated Useful Life in Years Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Subject to amortization: Customer and contractual relationships 2 - 12.75 $ 403.6 $ 200.4 $ 203.2 $ 384.9 $ 179.9 $ 205.0 Contractor relationships 2 - 5 71.1 70.7 0.4 71.1 70.6 0.5 Backlog 1 - 2.75 28.3 25.9 2.4 25.0 23.9 1.1 Non-compete agreements 2 - 7 25.6 15.9 9.7 24.8 13.8 11.0 In-use software 6 18.9 18.9 — 18.9 18.9 — 547.5 331.8 215.7 524.7 307.1 217.6 Not subject to amortization: Trademarks 258.9 — 258.9 258.9 — 258.9 Total $ 806.4 $ 331.8 $ 474.6 $ 783.6 $ 307.1 $ 476.5 Estimated future amortization expense is as follows (in millions): Remainder of 2020 $ 25.1 2021 41.0 2022 32.7 2023 28.0 2024 21.2 Thereafter 67.7 $ 215.7

Long-Term Debt (Notes)

Long-Term Debt (Notes)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Long-Term Debt	5. Long-Term Debt Long-term debt consisted of the following (in millions): June 30, December 31, Senior Secured Credit Facility: $250 million revolving credit facility, due 2024 $ — $ — Term B loan facility, due 2025 490.8 490.8 Unsecured Senior Notes, due 2028 550.0 550.0 1,040.8 1,040.8 Unamortized deferred loan costs (7.9 ) (8.5 ) Total Long-Term Debt $ 1,032.9 $ 1,032.3 Senior Secured Credit Facility The senior secured credit facility ("Credit Facility") consists of a term B loan and a senior secured revolving credit facility with a maximum borrowing capacity of $250.0 million (the "Revolver"). Borrowings under the term B loan bear interest at LIBOR plus 1.75 percent , or the bank’s base rate plus 0.75 percent . Borrowings under the Revolver bear interest at LIBOR plus 1.25 percent to 2.25 percent , or the bank’s base rate plus 0.25 to 1.25 percent , depending on leverage levels. At June 30, 2020 , the Company had no outstanding borrowings under the Revolver and had $3.9 million in undrawn stand-by letters of credit to secure certain obligations. A commitment fee of 0.20 to 0.35 percent is payable on the undrawn portion of the Revolver. There are no required minimum payments on the Credit Facility and it is secured by substantially all of the Company's assets and includes various restrictive covenants. The Company is required to make mandatory prepayments on its term B loan from excess cash flow and with the proceeds of asset sales, debt issuances and specified other events, subject to certain exceptions. The Revolver is limited to a maximum ratio of senior secured debt to trailing 12-months of lender defined consolidated EBITDA. At June 30, 2020 , the Company was in compliance with its debt covenants. Unsecured Senior Notes The Company has $550.0 million of unsecured senior notes due in 2028 (the "Senior Notes"). The Senior Notes bear interest at 4.625 percent , which is payable in arrears on May 15 and November 15 of each year. The Senior Notes are unsecured obligations and are subordinate to the Company's Credit Facility to the extent of the collateral securing such facility. The Senior Notes also contain certain customary limitations including, among other terms and conditions, the Company's ability to incur additional indebtedness, engage in mergers and acquisitions, transfer or sell assets and make certain distributions.

Commitments and Contingencies (

Commitments and Contingencies (Notes)	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	6. Commitments and Contingencies The Company’s deferred compensation plan liability was $12.2 million and $11.8 million at June 30, 2020 and December 31, 2019 , respectively, and was primarily included in other long-term liabilities. The employees' deferred compensation is deposited in a rabbi trust (see Note 12. Fair Value Measurements ). The Company is involved in various legal proceedings, claims and litigation arising in the ordinary course of business. The Company does not believe that the disposition of matters that are pending or asserted will have a material effect on its condensed consolidated financial statements.

Revenues (Notes)

Revenues (Notes)	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenues	8. Revenues The Company’s contracts have termination for convenience provisions and do not have substantive termination penalties; therefore, the contract duration for accounting purposes may be less than the stated terms. For accounting purposes, the Company's contracts with customers are considered to be of a short-term nature (one year or less). The Company does not disclose the value of remaining performance obligations for short-term contracts. The Company has contract liabilities of $12.1 million and $8.4 million at June 30, 2020 and December 31, 2019

Income Taxes (Notes)

Income Taxes (Notes)	6 Months Ended
	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	9. Income Taxes For interim reporting periods, the Company’s provision for income taxes is calculated using its annualized estimated effective tax rate for the year. This rate is based on its estimated full year income and the related income tax expense for each jurisdiction in which the Company operates. The effective tax rate can be affected by changes in the geographical mix, permanent differences and the estimate of full year pretax accounting income. This rate is adjusted for the effects of discrete items occurring in the period.

Earnings Per Share (Notes)

Earnings Per Share (Notes)	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Earnings per share	10. Earnings per Share The following is a reconciliation of the number of shares and share equivalents used to calculate basic and diluted earnings per share (in millions, except per share data): Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Net income $ 48.8 $ 43.1 $ 92.6 $ 78.0 Weighted-average number of common shares outstanding - basic 52.5 52.8 52.7 52.7 Dilutive effect of share equivalents 0.5 0.6 0.4 0.6 Number of common shares and share equivalents outstanding - diluted 53.0 53.4 53.1 53.3 Basic earnings per share $0.93 $0.82 $1.76 $1.48 Diluted earnings per share $0.92 $0.81 $1.74 $1.46 Anti-dilutive share equivalents (1) 0.5 0.2 0.3 0.3 _____ (1) Anti-dilutive stock-based awards that were excluded from the calculation of the number of shares used to compute diluted earnings per share because they were anti-dilutive when applying the treasury-stock method.

Segment Reporting (Notes)

Segment Reporting (Notes)	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Segment Reporting	11. Segment Reporting ASGN provides IT and professional staffing services in the technology, digital, creative, engineering and life sciences fields across commercial and government sectors. ASGN operates through its Apex, Oxford and ECS segments. The Apex Segment provides technology, digital, creative, scientific, engineering staffing and consulting services to Fortune 1000 and mid-market clients across the United States and Canada. The Oxford Segment provides hard-to-find technology, digital, engineering and life sciences staffing and consulting services in select skill and geographic markets in the United States and Europe. The Company’s commercial business is comprised of the Apex and Oxford segments. The ECS Segment, the Company’s federal government IT solutions business, delivers advanced solutions in cloud, cybersecurity, artificial intelligence, machine learning, application and IT modernization, science and engineering to U.S. defense, intelligence and federal civilian agencies. The Company has three major revenue streams: (i) contract, (ii) permanent placement and (iii) federal government IT solutions. The Company’s contract revenues are comprised of assignment revenues and consulting revenues. Consulting services consist of deliverables-based projects including support service centers and managed projects such as software development. The Company’s management evaluates the performance of each segment primarily based on revenues, gross profit and operating income. The information in the following tables is derived directly from internal financial reporting of the segments used for corporate management purposes. The following tables present revenues, gross profit, operating income and amortization by segment (in millions): Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Apex Revenues $ 576.9 $ 628.5 $ 1,206.0 $ 1,234.6 Gross profit 170.6 187.8 355.1 363.2 Operating income 66.0 72.9 133.1 133.9 Amortization 5.5 5.5 10.8 11.5 Oxford Revenues $ 120.2 $ 153.2 $ 268.9 $ 302.8 Gross profit 46.4 62.5 105.7 121.4 Operating income 7.8 11.0 18.9 22.7 Amortization 0.1 1.0 0.3 2.0 ECS Revenues $ 239.7 $ 190.6 $ 452.4 $ 358.6 Gross profit 43.8 34.9 80.9 64.5 Operating income 16.2 10.9 27.5 17.8 Amortization 7.0 6.6 13.6 13.4 Consolidated Revenues $ 936.8 $ 972.3 $ 1,927.3 $ 1,896.0 Gross profit 260.8 285.2 541.7 549.1 Operating income (1) 76.0 73.3 146.9 136.0 Amortization 12.6 13.1 24.7 26.9 ____________ (1) Consolidated operating income includes corporate operating expenses, which are not allocated to the segments, consisting of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses and depreciation expense for corporate assets. The following table presents segment revenues by type (in millions): Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Apex Contract — Assignment $ 483.8 $ 533.5 $ 1,010.1 $ 1,053.3 Consulting 85.3 79.5 174.9 151.9 569.1 613.0 1,185.0 1,205.2 Permanent placement 7.8 15.5 21.0 29.4 576.9 628.5 1,206.0 1,234.6 Oxford Contract — Assignment $ 96.2 $ 117.1 $ 211.1 $ 234.7 Consulting 11.1 14.3 24.3 26.1 107.3 131.4 235.4 260.8 Permanent placement 12.9 21.8 33.5 42.0 120.2 153.2 268.9 302.8 ECS Firm-fixed-price $ 63.5 $ 46.1 $ 120.5 $ 89.4 Time and materials 81.4 70.8 153.8 132.2 Cost reimbursable 94.8 73.7 178.1 137.0 239.7 190.6 452.4 358.6 Consolidated $ 936.8 $ 972.3 $ 1,927.3 $ 1,896.0 The Company operates internationally, with operations mainly in the United States. The following table presents revenues within and outside of the United States (in millions): Three Months Ended Six Months Ended June 30, June 30, 2020 % 2019 % 2020 % 2019 % Revenues: Domestic $ 897.9 95.8 % $ 929.8 95.6 % $ 1,843.3 95.6 % $ 1,810.9 95.5 % Foreign 38.9 4.2 % 42.5 4.4 % 84.0 4.4 % 85.1 4.5 % $ 936.8 100.0 % $ 972.3 100.0 % $ 1,927.3 100.0 % $ 1,896.0 100.0 % The following table presents the ECS segment (federal government IT solutions) revenues by customer type (in millions): Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Department of Defense and Intelligence Agencies $ 127.1 $ 107.6 $ 242.0 $ 203.6 Federal Civilian 96.0 71.3 180.6 131.5 Other 16.6 11.7 29.8 23.5 $ 239.7 $ 190.6 $ 452.4 $ 358.6

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	12. Fair Value Measurements The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and accrued payroll and contract professional pay approximate their fair value based on their short-term nature. The carrying amount of long-term debt recorded in the Company’s condensed consolidated balance sheet at June 30, 2020 was $1.0 billion and approximated its fair value (see Note 5. Long-Term Debt ), which was determined using quoted prices in active markets for identical liabilities (Level 1 inputs) . The Company has a deferred compensation plan and the employees' deferred compensation is deposited in a rabbi trust. This rabbi trust had investments, primarily mutual funds, of $12.2 million and $11.8 million at June 30, 2020 and December 31, 2019 , respectively, which are measured at fair value using the net asset value per share. These assets were primarily included in other non-current assets.

Goodwill and Identifiable Ass_2

Goodwill and Identifiable Assets (Tables)	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in the carrying amount of goodwill by segment for the six months ended June 30, 2020 and the year ended December 31, 2019 were as follows (in millions): Apex Oxford ECS Total Balance as of December 31, 2018 $ 662.1 $ 230.8 $ 528.2 $ 1,421.1 DHA acquisition — — 24.7 24.7 Intersys acquisition 41.4 — — 41.4 Translation adjustment — (0.3 ) — (0.3 ) Balance as of December 31, 2019 703.5 230.5 552.9 1,486.9 Blackstone Federal acquisition — — 61.1 61.1 Translation adjustment (0.5 ) (0.2 ) — (0.7 ) Balance as of June 30, 2020 $ 703.0 $ 230.3 $ 614.0 $ 1,547.3
Schedule of Acquired Intangible Assets	Acquired intangible assets consisted of the following (in millions): June 30, 2020 December 31, 2019 Estimated Useful Life in Years Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Subject to amortization: Customer and contractual relationships 2 - 12.75 $ 403.6 $ 200.4 $ 203.2 $ 384.9 $ 179.9 $ 205.0 Contractor relationships 2 - 5 71.1 70.7 0.4 71.1 70.6 0.5 Backlog 1 - 2.75 28.3 25.9 2.4 25.0 23.9 1.1 Non-compete agreements 2 - 7 25.6 15.9 9.7 24.8 13.8 11.0 In-use software 6 18.9 18.9 — 18.9 18.9 — 547.5 331.8 215.7 524.7 307.1 217.6 Not subject to amortization: Trademarks 258.9 — 258.9 258.9 — 258.9 Total $ 806.4 $ 331.8 $ 474.6 $ 783.6 $ 307.1 $ 476.5
Schedule of Estimated Future Amortization Expense	Estimated future amortization expense is as follows (in millions): Remainder of 2020 $ 25.1 2021 41.0 2022 32.7 2023 28.0 2024 21.2 Thereafter 67.7 $ 215.7

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consisted of the following (in millions): June 30, December 31, Senior Secured Credit Facility: $250 million revolving credit facility, due 2024 $ — $ — Term B loan facility, due 2025 490.8 490.8 Unsecured Senior Notes, due 2028 550.0 550.0 1,040.8 1,040.8 Unamortized deferred loan costs (7.9 ) (8.5 ) Total Long-Term Debt $ 1,032.9 $ 1,032.3

Earnings Per Share Schedule Of

Earnings Per Share Schedule Of Earnings Per Share Basic And Diluted Table (Tables)	6 Months Ended
	Jun. 30, 2020
Calculation of Basic and Diluted Earnings per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following is a reconciliation of the number of shares and share equivalents used to calculate basic and diluted earnings per share (in millions, except per share data): Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Net income $ 48.8 $ 43.1 $ 92.6 $ 78.0 Weighted-average number of common shares outstanding - basic 52.5 52.8 52.7 52.7 Dilutive effect of share equivalents 0.5 0.6 0.4 0.6 Number of common shares and share equivalents outstanding - diluted 53.0 53.4 53.1 53.3 Basic earnings per share $0.93 $0.82 $1.76 $1.48 Diluted earnings per share $0.92 $0.81 $1.74 $1.46 Anti-dilutive share equivalents (1) 0.5 0.2 0.3 0.3 _____ (1)

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2020
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	The following tables present revenues, gross profit, operating income and amortization by segment (in millions): Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Apex Revenues $ 576.9 $ 628.5 $ 1,206.0 $ 1,234.6 Gross profit 170.6 187.8 355.1 363.2 Operating income 66.0 72.9 133.1 133.9 Amortization 5.5 5.5 10.8 11.5 Oxford Revenues $ 120.2 $ 153.2 $ 268.9 $ 302.8 Gross profit 46.4 62.5 105.7 121.4 Operating income 7.8 11.0 18.9 22.7 Amortization 0.1 1.0 0.3 2.0 ECS Revenues $ 239.7 $ 190.6 $ 452.4 $ 358.6 Gross profit 43.8 34.9 80.9 64.5 Operating income 16.2 10.9 27.5 17.8 Amortization 7.0 6.6 13.6 13.4 Consolidated Revenues $ 936.8 $ 972.3 $ 1,927.3 $ 1,896.0 Gross profit 260.8 285.2 541.7 549.1 Operating income (1) 76.0 73.3 146.9 136.0 Amortization 12.6 13.1 24.7 26.9 ____________ (1) Consolidated operating income includes corporate operating expenses, which are not allocated to the segments, consisting of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses and depreciation expense for corporate assets.
Disaggregation of Revenue	The following table presents segment revenues by type (in millions): Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Apex Contract — Assignment $ 483.8 $ 533.5 $ 1,010.1 $ 1,053.3 Consulting 85.3 79.5 174.9 151.9 569.1 613.0 1,185.0 1,205.2 Permanent placement 7.8 15.5 21.0 29.4 576.9 628.5 1,206.0 1,234.6 Oxford Contract — Assignment $ 96.2 $ 117.1 $ 211.1 $ 234.7 Consulting 11.1 14.3 24.3 26.1 107.3 131.4 235.4 260.8 Permanent placement 12.9 21.8 33.5 42.0 120.2 153.2 268.9 302.8 ECS Firm-fixed-price $ 63.5 $ 46.1 $ 120.5 $ 89.4 Time and materials 81.4 70.8 153.8 132.2 Cost reimbursable 94.8 73.7 178.1 137.0 239.7 190.6 452.4 358.6 Consolidated $ 936.8 $ 972.3 $ 1,927.3 $ 1,896.0
Schedule of Revenue by Geographical Areas	The Company operates internationally, with operations mainly in the United States. The following table presents revenues within and outside of the United States (in millions): Three Months Ended Six Months Ended June 30, June 30, 2020 % 2019 % 2020 % 2019 % Revenues: Domestic $ 897.9 95.8 % $ 929.8 95.6 % $ 1,843.3 95.6 % $ 1,810.9 95.5 % Foreign 38.9 4.2 % 42.5 4.4 % 84.0 4.4 % 85.1 4.5 % $ 936.8 100.0 % $ 972.3 100.0 % $ 1,927.3 100.0 % $ 1,896.0 100.0 %
Revenue from External Customers by Products and Services	The following table presents the ECS segment (federal government IT solutions) revenues by customer type (in millions): Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Department of Defense and Intelligence Agencies $ 127.1 $ 107.6 $ 242.0 $ 203.6 Federal Civilian 96.0 71.3 180.6 131.5 Other 16.6 11.7 29.8 23.5 $ 239.7 $ 190.6 $ 452.4 $ 358.6

Financial Statement Presentat_2

Financial Statement Presentation Care Act (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)Rate
Presentation of Financial Statements [Abstract]
Federal Tax Deferred (Cares Act) | $	$ 31.1
Percent of Federal Tax Deferred (Cares Act) | Rate	50.00%

Accounting Standard Update Clou

Accounting Standard Update Cloud Computing (Details) $ in Millions	Jun. 30, 2020USD ($)
Capitalized Implementation Costs Disclosure [Abstract]
Capitalized Implementation Cost	$ 2

Accounting Standard Update Allo

Accounting Standard Update Allowance for Credit Loss (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Allowance for Credit Loss [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ 5.7	$ 5.1

Leases Related Party Leases (De

Leases Related Party Leases (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)property	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)property	Jun. 30, 2019USD ($)
Related Party Transactions [Abstract]
Number of Leased Properties Owned by Related Parties | property	2		2
Costs and Expenses, Related Party | $	$ 0.2	$ 0.3	$ 0.4	$ 0.6

Acquisitions Business Combinati

Acquisitions Business Combinations Additional Information (Details) - USD ($) $ in Millions	Jan. 24, 2020	Oct. 17, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired			$ 85.5	$ 48.5
Goodwill			1,547.3		$ 1,486.9
BlackStone Federal
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Jan. 24, 2020
Business Acquisition, Name of Acquired Entity	Blackstone Technology Group
Cash paid for acquisitions, net of cash acquired	$ 85.5
Business Acquisition, Description of Acquired Entity	headquartered in Arlington, Virginia
Business Combination, Reason for Business Combination	The acquisition expands the Company's capabilities in agile application development, cloud modernization and systems architecture, cybersecurity, user experience design and branding services to government clients
Goodwill, Acquired During Period	$ 61.1		$ 61.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	$ 22.8
Intersys
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Oct. 17, 2019
Business Acquisition, Name of Acquired Entity		Intersys Consulting, LLC
Cash paid for acquisitions, net of cash acquired		$ 67
Business Acquisition, Description of Acquired Entity		headquartered in Austin, Texas
Business Combination, Reason for Business Combination		The acquisition expands the Company's capabilities in digital innovation and enterprise solutions
Goodwill		$ 41.4
Goodwill, Acquired During Period					$ 41.4
Business Acquisition, Goodwill, Expected Tax Deductible Amount		38.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets		$ 23.8
Minimum [Member] | BlackStone Federal
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Minimum [Member] | Intersys
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		3 years
Maximum [Member] | BlackStone Federal
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	9 years
Maximum [Member] | Intersys
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years

Goodwill and Identifiable Ass_3

Goodwill and Identifiable Assets (Goodwill) (Details) - USD ($) $ in Millions	Jan. 24, 2020	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Gross goodwill		$ 1,547.3	$ 1,486.9	$ 1,421.1
Translation adjustment		(0.7)	(0.3)
Apex
Goodwill [Roll Forward]
Gross goodwill		703	703.5	662.1
Translation adjustment		(0.5)
Oxford
Goodwill [Roll Forward]
Gross goodwill		230.3	230.5	230.8
Translation adjustment		(0.2)	(0.3)
ECS
Goodwill [Roll Forward]
Gross goodwill		614	552.9	$ 528.2
DHA
Goodwill [Roll Forward]
Goodwill, Acquired During Period			24.7
Intersys
Goodwill [Roll Forward]
Goodwill, Acquired During Period			$ 41.4
BlackStone Federal
Goodwill [Roll Forward]
Goodwill, Acquired During Period	$ 61.1	$ 61.1

Goodwill and Identifiable Ass_4

Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Intangible assets subject to amortization:
Gross Carrying Amount	$ 547.5	$ 524.7
Accumulated Amortization	331.8	307.1
Net Carrying Amount	215.7	217.6
Intangible assets not subject to amortization:
Trademarks, Carrying Amount	258.9	258.9
Intangible Assets, Gross (Excluding Goodwill)	806.4	783.6
Intangible Assets, Net (Excluding Goodwill)	474.6	476.5
Customer and Contractual Relationships
Intangible assets subject to amortization:
Gross Carrying Amount	403.6	384.9
Accumulated Amortization	200.4	179.9
Net Carrying Amount	$ 203.2	205
Customer and Contractual Relationships | Minimum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 months
Customer and Contractual Relationships | Maximum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years 9 months
Contractor Relations
Intangible assets subject to amortization:
Gross Carrying Amount	$ 71.1	71.1
Accumulated Amortization	70.7	70.6
Net Carrying Amount	$ 0.4	0.5
Contractor Relations | Minimum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years
Contractor Relations | Maximum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Backlog
Intangible assets subject to amortization:
Gross Carrying Amount	$ 28.3	25
Accumulated Amortization	25.9	23.9
Net Carrying Amount	$ 2.4	1.1
Backlog | Minimum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Backlog | Maximum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years 9 months
Noncompete Agreements
Intangible assets subject to amortization:
Gross Carrying Amount	$ 25.6	24.8
Accumulated Amortization	15.9	13.8
Net Carrying Amount	$ 9.7	11
Noncompete Agreements | Minimum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years
Noncompete Agreements | Maximum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
In-use software
Intangible assets subject to amortization:
Gross Carrying Amount	$ 18.9	18.9
Accumulated Amortization	18.9	18.9
Net Carrying Amount	$ 0	$ 0
In-use software | Minimum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years

Goodwill and Identifiable Ass_5

Goodwill and Identifiable Assets (Future Amortization Expense) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2019	$ 25.1
2020	41
2021	32.7
2022	28
2023	21.2
Thereafter	67.7
Net Carrying Amount	$ 215.7	$ 217.6

Long-term Debt (Details)

Long-term Debt (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Senior Notes	$ 550	$ 550
Long-term Debt, Gross	1,040.8	1,040.8
Unamortized Debt Issuance Expense	7.9	8.5
Long-term Debt	1,032.9	1,032.3
Letters of Credit Outstanding, Amount	3.9
$250 Million Revolving Credit Facility, Due November 2024 [Member]
Debt Instrument [Line Items]
Secured Debt	0	0
Line of Credit Facility, Maximum Borrowing Capacity	250
$822 Million Term B Loan Facility, due April 2025 [Member] [Domain]
Debt Instrument [Line Items]
Secured Debt	$ 490.8	$ 490.8
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Notes Payable to Banks [Member] | $250 Million Revolving Credit Facility, Due November 2024 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.25%
Notes Payable to Banks [Member] | $250 Million Revolving Credit Facility, Due November 2024 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Notes Payable to Banks [Member] | $822 Million Term B Loan Facility, due April 2025 [Member] [Domain] | Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.20%
Notes Payable to Banks [Member] | $822 Million Term B Loan Facility, due April 2025 [Member] [Domain] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.75%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.35%
Notes Payable to Banks [Member] | Eurodollar [Member] | $250 Million Revolving Credit Facility, Due November 2024 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Notes Payable to Banks [Member] | Eurodollar [Member] | $250 Million Revolving Credit Facility, Due November 2024 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Notes Payable to Banks [Member] | Eurodollar [Member] | $822 Million Term B Loan Facility, due April 2025 [Member] [Domain] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Other Commitments [Line Items]
Deferred Compensation Liability, Classified, Noncurrent	$ 12.2	$ 11.8

Revenues (Details)

Revenues (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Deferred Revenue	$ 12.1	$ 8.4

Earnings Per Share Calculation

Earnings Per Share Calculation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Calculation of Basic and Diluted Earnings per Share [Abstract]
Net income		$ 48.8	$ 43.1	$ 92.6	$ 78
Weighted average number of common shares		52.5	52.8	52.7	52.7
Dilutive effect of stock-based awards		0.5	0.6	0.4	0.6
Number of shares used to compute diluted earnings per share		53	53.4	53.1	53.3
Basic		$ 0.93	$ 0.82	$ 1.76	$ 1.48
Diluted		$ 0.92	$ 0.81	$ 1.74	$ 1.46
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	[1]	0.5	0.2	0.3
[1]	Anti-dilutive stock-based awards that were excluded from the calculation of the number of shares used to compute diluted earnings per share because they were anti-dilutive when applying the treasury-stock method.

Segment Reporting (Segment Repo

Segment Reporting (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Revenues	$ 936.8	$ 972.3	$ 1,927.3	$ 1,896
Gross Profit:
Total Gross Profit	260.8	285.2	541.7	549.1
Operating Income (Loss):
Total Operating Income	76	73.3	146.9	136
Amortization of Intangible Assets	12.6	13.1	24.7	26.9
Apex
Revenues:
Revenues	576.9	628.5	1,206	1,234.6
Gross Profit:
Total Gross Profit	170.6	187.8	355.1	363.2
Operating Income (Loss):
Total Operating Income	66	72.9	133.1	133.9
Amortization of Intangible Assets	5.5	5.5	10.8	11.5
Oxford
Revenues:
Revenues	120.2	153.2	268.9	302.8
Gross Profit:
Total Gross Profit	46.4	62.5	105.7	121.4
Operating Income (Loss):
Total Operating Income	7.8	11	18.9	22.7
Amortization of Intangible Assets	0.1	1	0.3	2
ECS
Revenues:
Revenues	239.7	190.6	452.4	358.6
Gross Profit:
Total Gross Profit	43.8	34.9	80.9	64.5
Operating Income (Loss):
Total Operating Income	16.2	10.9	27.5	17.8
Amortization of Intangible Assets	7	6.6	13.6	13.4
Assignment | Apex
Revenues:
Revenues	483.8	533.5	1,010.1	1,053.3
Assignment | Oxford
Revenues:
Revenues	96.2	117.1	211.1	234.7
IT consulting | Apex
Revenues:
Revenues	85.3	79.5	174.9	151.9
IT consulting | Oxford
Revenues:
Revenues	11.1	14.3	24.3	26.1
Contract Revenue | Apex
Revenues:
Revenues	569.1	613	1,185	1,205.2
Contract Revenue | Oxford
Revenues:
Revenues	107.3	131.4	235.4	260.8
Permanent placement | Apex
Revenues:
Revenues	7.8	15.5	21	29.4
Permanent placement | Oxford
Revenues:
Revenues	12.9	21.8	33.5	42
Fixed-price Contract | ECS
Revenues:
Revenues	63.5	46.1	120.5	89.4
Time and materials Contract | ECS
Revenues:
Revenues	81.4	70.8	153.8	132.2
Cost-plus-fixed-fee Contract | ECS
Revenues:
Revenues	$ 94.8	$ 73.7	$ 178.1	$ 137

Segment Reporting (Revenue by G

Segment Reporting (Revenue by Geographical Areas) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers [Line Items]
Revenues	$ 936.8	$ 972.3	$ 1,927.3	$ 1,896
Revenue as Percentage of Consolidated Revenue	100.00%	100.00%	100.00%	100.00%
Domestic
Revenues from External Customers [Line Items]
Revenues	$ 897.9	$ 929.8	$ 1,843.3	$ 1,810.9
Revenue as Percentage of Consolidated Revenue	95.80%	95.60%	95.60%	95.50%
Foreign
Revenues from External Customers [Line Items]
Revenues	$ 38.9	$ 42.5	$ 84	$ 85.1
Revenue as Percentage of Consolidated Revenue	4.20%	4.40%	4.40%	4.50%

Segment Reporting Revenue by Cu

Segment Reporting Revenue by Customer Type (details) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from External Customer [Line Items]
Revenues	$ 936.8	$ 972.3	$ 1,927.3	$ 1,896
Department of Defense and Intelligence Agencies
Revenue from External Customer [Line Items]
Revenues	127.1	107.6	242	203.6
Federal Civilian
Revenue from External Customer [Line Items]
Revenues	96	71.3	180.6	131.5
Other
Revenue from External Customer [Line Items]
Revenues	16.6	11.7	29.8	23.5
ECS
Revenue from External Customer [Line Items]
Revenues	$ 239.7	$ 190.6	$ 452.4	$ 358.6

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Inputs, Liabilities, Quantitative Information) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Fair Value Inputs, Liabilities, Quantitative Information
Long-term Debt, Gross	$ 1,040.8	$ 1,040.8
Level 1 Inputs
Fair Value Inputs, Liabilities, Quantitative Information
Fair value level 1 inputs	quoted prices in active markets for identical liabilities (Level 1 inputs)
Fair Value Measured at Net Asset Value Per Share [Member]
Fair Value Inputs, Liabilities, Quantitative Information
Deferred Compensation Plan Assets	$ 12.2	$ 11.8