ASGN (ASGN) 10-Q 7 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares shares in Millions	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
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)		53.2
Entity Central Index Key	0000890564
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) shares in Millions, $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 386.5	$ 274.4
Accounts receivable, net	646.9	678.7
Prepaid expenses and income taxes	20.2	23.3
Other current assets	20.6	18
Total current assets	1,074.2	994.4
Property and equipment, net	68.3	69.4
Operating lease right-of-use assets	76.2	84.9
Identifiable intangible assets, net	475.6	487.9
Goodwill	1,617.5	1,618.4
Other	22.7	23
Total assets	3,334.5	3,278
Accounts payable	29.9	39.8
Accrued payroll and contract professional pay	284.7	266.1
Operating lease liabilities	28	29.4
Other current liabilities	86.3	80.9
Total current liabilities	428.9	416.2
Long-term Debt	1,033.7	1,033.4
Operating Lease, Liability, Noncurrent	55	62.9
Deferred income tax liabilities	108.6	108.7
Other	62.5	69.7
Total liabilities	1,688.7	1,690.9
Commitments and Contingencies (Note 5)
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	0.5	0.5
Paid-in capital	674.5	661.3
Retained earnings	975	926.3
Accumulated other comprehensive loss	(4.2)	(1)
Total stockholders’ equity	1,645.8	1,587.1
Total liabilities and stockholders’ equity	$ 3,334.5	$ 3,278
Common Stock, Shares Outstanding	53.2
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	75	75
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (in shares)	1	1
Preferred Stock, shares issued (in shares)	0	0

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares shares in Millions	Mar. 31, 2021	Dec. 31, 2020
Stockholders’ equity:
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (in shares)	1	1
Preferred Stock, shares issued (in shares)	0	0
Common Stock, Shares Outstanding	53.2
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	75	75

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues	$ 1,025.7	$ 990.5
Cost of services	744.7	709.6
Gross profit	281	280.9
Selling, general and administrative expenses	194	197.9
Amortization of intangible assets	12.2	12.1
Operating income	74.8	70.9
Interest expense	(9.2)	(11.4)
Income before income taxes	65.6	59.5
Provision for income taxes	16.9	15.7
Income from continuing operations	48.7
Net income	$ 48.7	$ 43.8
Earnings per share:
Basic earnings per share	$ 0.92	$ 0.83
Diluted earnings per share	$ 0.91	$ 0.82
Number of shares and share equivalents used to calculate earnings per share:
Weighted-average number of common shares outstanding - basic	53	52.8
Diluted	53.7	53.3
Reconciliation of net income to comprehensive income:
Net income	$ 48.7	$ 43.8
Foreign currency translation adjustment	(3.2)	(2.5)
Comprehensive income	$ 45.5	$ 41.3

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	Other
Common Stock, Shares		52.9
Total stockholders’ equity at Dec. 31, 2019	$ 1,376.2	$ 0.5	$ 638	$ 744.7	$ (7)
Vesting of restricted stock units, shares		0.1
Vesting of restricted stock units, value	(4.9)		(4.9)
Employee stock purchase plan, shares		0.2
Employee stock purchase plan, value	5.9		5.9
Stock-based compensation expense	8.9		8.9
Stock Repurchased and Retired During Period, Shares		(0.8)
Stock Repurchased and Retired During Period, Value	(27.9)		(9.2)	(18.7)
Foreign currency translation adjustments	(2.5)				(2.5)
Net income	43.8			43.8
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)
Common Stock, Shares		52.9
Total stockholders’ equity at Dec. 31, 2020	1,587.1	$ 0.5	661.3	926.3	(1)
Vesting of restricted stock units, shares		0.1
Vesting of restricted stock units, value	(4.8)		(4.8)
Employee stock purchase plan, shares		0.2
Employee stock purchase plan, value	7.6		7.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0.1		0.1
Stock-based compensation expense	10.3		10.3
Foreign currency translation adjustments	(3.2)				(3.2)
Net income	48.7			48.7
Shares Outstanding at Mar. 31, 2021		53.2
Total stockholders’ equity at Mar. 31, 2021	$ 1,645.8	$ 0.5	$ 674.5	$ 975	$ (4.2)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows from Operating Activities:
Net income	$ 48.7	$ 43.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22	21.4
Stock-based compensation	10.3	8.7
Other	(1)	(1.7)
Changes in operating assets and liabilities:
Accounts receivable	30.3	(30.5)
Prepaid expenses and income taxes	3	7.9
Accounts payable	(10)	(3.9)
Accrued payroll and contract professional pay	19.3	9.1
Income taxes payable	9.9	5.7
Operating lease right of use assets	8.9	7.2
Operating lease liabilities	(9.5)	(7.4)
Other	(14.1)	0.4
Net cash provided by operating activities	119.8	64.1
Cash Flows from Investing Activities:
Cash paid for property and equipment	(9.3)	(15.3)
Cash paid for acquisitions, net of cash acquired	0	(85.5)
Other	(0.1)	(0.2)
Net cash used in investing activities	(9.4)	(101)
Cash Flows from Financing Activities:
Proceeds from long-term debt	0	65.5
Principal payments of long-term debt	0	(32.5)
Proceeds from option exercises and employee stock purchase plan	7.7	5.9
Payment of employment taxes related to release of restricted stock awards	(4.8)	(4.9)
Repurchase of common stock	0	(27.9)
Net cash provided by financing activities	2.9	6.1
Effect of Exchange Rate on Cash and Cash Equivalents	(1.2)	(0.4)
Net Increase (Decrease) in Cash and Cash Equivalents	112.1	(31.2)
Cash and Cash Equivalents at Beginning of Year	274.4	95.2
Cash and Cash Equivalents at End of Period	386.5	64
Supplemental Disclosure of Cash Flow Information Cash paid for:
Income Taxes Paid	2.6	1.2
Interest	2.4	4.7
Operating lease liabilities	8.8	8.4
Non-cash transactions —
Operating lease right of use assets obtained in exchange for operating lease liabilities	$ 0.3	$ 8.5

General (Notes)

General (Notes)	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Statement Presentation	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 ("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, 2020 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, 2020 ("2020 10-K").

Acquisitions (Notes)

Acquisitions (Notes)	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
Acquisitions	In 2020, the Company acquired four consulting services businesses for $186.0 million in aggregate purchase consideration. None of these acquisitions were material individually or in the aggregate. At March 31, 2021, the Company had not finalized the determination of fair values allocated to all of the assets and liabilities for certain of these acquisitions.

Goodwill and Identifiable Asset

Goodwill and Identifiable Assets (Notes)	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Identifiable Intangible Assets	Goodwill and Identifiable Intangible Assets The following table summarizes the activity related to the carrying amount of goodwill by reportable segment for the three months ended March 31, 2021 and the year ended December 31, 2020 (in millions): Apex Segment Oxford Segment ECS Segment Total Balance as of December 31, 2019 $ 703.5 $ 230.5 $ 552.9 $ 1,486.9 2020 acquisitions (1) 40.3 — 89.2 129.5 Translation adjustment (0.1) 2.1 — 2.0 Balance as of December 31, 2020 743.7 232.6 642.1 1,618.4 Purchase price adjustments — — 0.2 0.2 Translation adjustment (0.1) (1.0) — (1.1) Balance as of March 31, 2021 $ 743.6 $ 231.6 $ 642.3 $ 1,617.5 _____ (1) For the 2020 acquisitions, approximately $77.1 million of the goodwill was deductible for income tax purposes. Acquired intangible assets consisted of the following (in millions): March 31, 2021 December 31, 2020 Estimated Useful Life in Years Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer and contractual relationships 7.3 - 12.8 $ 440.9 $ 233.4 $ 207.5 $ 441.3 $ 222.9 $ 218.4 Contractor relationships 4.0 71.1 71.0 0.1 71.2 71.0 0.2 Contract Backlog 1.0 - 2.8 29.3 28.7 0.6 29.3 28.5 0.8 Non-compete agreements 3.0 - 5.0 27.8 19.3 8.5 27.8 18.2 9.6 569.1 352.4 216.7 569.6 340.6 229.0 Not subject to amortization: Trademarks 258.9 — 258.9 258.9 — 258.9 Total $ 828.0 $ 352.4 $ 475.6 $ 828.5 $ 340.6 $ 487.9 Estimated future amortization expense follows (in millions): Remainder of 2021 $ 35.6 2022 39.1 2023 33.9 2024 26.6 2025 21.5 Thereafter 60.0 $ 216.7

Long-Term Debt (Notes)

Long-Term Debt (Notes)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Long-Term Debt	Long-term debt consisted of the following (in millions): March 31, 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 (7.1) (7.4) $ 1,033.7 $ 1,033.4 Senior Secured Credit Facility — The senior secured credit facility ("Credit Facility") consists of a term B loan and a $250.0 million revolving credit facility ("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 to 2.25 percent, or the bank’s base rate plus 0.25 to 1.25 percent, depending on leverage levels. A commitment fee of 0.20 to 0.35 percent is payable on the undrawn portion of the Revolver. The Revolver is limited to a maximum ratio of senior secured debt to trailing 12-months of lender-defined consolidated EBITDA of 4.00 to 1.00, which was 1.13 to 1.00 at March 31, 2021. 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. At March 31, 2021, the Company was in compliance with its debt covenants. Unsecured Senior Notes — The Company has $550.0 million of unsecured senior notes ("Senior Notes"), which bear interest at 4.625 percent. Interest is payable semiannually in arrears on May 15 and November 15. 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)	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	The Company’s deferred compensation plan liability was $14.1 million and $14.4 million at March 31, 2021 and December 31, 2020, respectively. The employees' deferred compensation is deposited in a rabbi trust (see Note 10. Fair Value Measurements ).

Revenues (Notes)

Revenues (Notes)	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenues	The Company has contract liabilities of $14.0 million and $18.4 million at March 31, 2021 and December 31, 2020, respectively, for payments received in advance of providing services under certain contracts. Contract liabilities are included in other current liabilities on the condensed consolidated balance sheets and are generally recognized as revenues within three months from the balance sheet date.

Income Taxes (Notes)

Income Taxes (Notes)	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
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)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings per share	The following table shows the calculation of basic and diluted earnings per share (in millions, except per share amounts): Three Months Ended March 31, 2021 2020 Net income $ 48.7 $ 43.8 Weighted-average number of common shares outstanding - basic 53.0 52.8 Dilutive effect of share equivalents 0.7 0.5 Number of common shares and share equivalents outstanding - diluted 53.7 53.3 Basic earnings per share $ 0.92 $ 0.83 Diluted earnings per share $ 0.91 $ 0.82 Number of anti-dilutive share equivalents — 0.3

Segment Reporting (Notes)

Segment Reporting (Notes)	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Segment Reporting Disclosure	ASGN provides professional staffing and IT consulting services in the technology, digital, creative, engineering and life sciences fields across commercial and government sectors. ASGN operates through its Commercial and Federal Government businesses. The Commercial business is comprised of the Apex and Oxford segments, and the Federal Government business is the ECS segment. Approximately 95 percent of the Company's revenues are generated in the United States. 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 ECS segment 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. Management evaluates the performance of each segment primarily based on revenues, gross profit and operating income, which is derived directly from internal financial reporting of the segments used for corporate management purposes, which is presented below by segment (in millions): Three Months Ended March 31, 2021 2020 Apex Revenues $ 630.4 $ 629.1 Gross profit 182.0 184.5 Operating income 68.5 67.1 Amortization 5.7 5.3 Oxford Revenues $ 137.5 $ 148.7 Gross profit 54.0 59.3 Operating income 11.3 11.1 Amortization 0.1 0.2 ECS Revenues $ 257.8 $ 212.7 Gross profit 45.0 37.1 Operating income 14.8 11.3 Amortization 6.4 6.6 Consolidated Revenues $ 1,025.7 $ 990.5 Gross profit 281.0 280.9 Operating income (1) 74.8 70.9 Amortization 12.2 12.1 ___________________ (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 Company has three major revenue sources: (i) Assignment, (ii) Consulting and (iii) Federal Government. Permanent placement revenues for full year 2020 were approximately 2.6 percent of total revenues and are no longer significant to our consolidated results for disclosure purposes. Consequently, we no longer present these revenues separately in our financial statements and instead they are included in assignment revenues. For comparability, all prior periods have been recast for this change in presentation. The following table presents disaggregated revenues by type (in millions): Three Months Ended March 31, 2021 2020 Apex Assignment $ 512.8 $ 539.5 Consulting 117.6 89.6 630.4 629.1 Oxford Assignment 117.4 135.5 Consulting 20.1 13.2 137.5 148.7 ECS Firm-fixed-price 60.5 57.0 Time and materials 90.7 72.4 Cost reimbursable 106.6 83.3 257.8 212.7 Consolidated $ 1,025.7 $ 990.5 The following table presents the ECS Segment (federal government business) revenues by customer type (in millions): Three Months Ended March 31, 2021 2020 Department of Defense and Intelligence Agencies $ 143.3 $ 114.9 Federal Civilian 92.5 84.6 Other 22.0 13.2 $ 257.8 $ 212.7

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Recurring 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 March 31, 2021 was $1.0 billion and approximated its fair value (see Note 4. Long-Term Debt ), which was determined using quoted prices in active markets for identical liabilities (Level 1 inputs). The Company had investments, primarily mutual funds of $14.1 million and $14.4 million at March 31, 2021 and December 31, 2020, respectively, held in a rabbi trust restricted to fund the Company's deferred compensation plan, which are measured at fair value using the net asset value practical expedient. These assets were primarily included in other noncurrent assets in the accompanying condensed consolidated balance sheets. Certain acquisitions completed in 2020 contained provisions requiring that the Company pay contingent consideration in the event the acquired businesses achieved certain specified earnings results in 2021. The Company determined the fair value of the contingent consideration as of each acquisition date using a valuation model which included the evaluation of the expected performance of the acquired entity against the target performance metric and the application of an appropriate discount rate (Level 3 inputs). At the end of each reporting period, the fair value of the contingent consideration was remeasured and any changes were recorded as an adjustment to goodwill if the purchase accounting window was still open. Contingent consideration liabilities with fair values of $5.0 million at March 31, 2021 and December 31, 2020 were included in other current liabilities and other non-current liabilities in the accompanying condensed consolidated balance sheets, respectively. Nonrecurring Fair Value Measurements —Certain assets, such as goodwill and trademarks, are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances, such as, when there is evidence of impairment. There were no fair value adjustments for non-financial assets or liabilities during the three months ended March 31, 2021 and 2020.

Goodwill and Identifiable Ass_2

Goodwill and Identifiable Assets (Tables)	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table summarizes the activity related to the carrying amount of goodwill by reportable segment for the three months ended March 31, 2021 and the year ended December 31, 2020 (in millions): Apex Segment Oxford Segment ECS Segment Total Balance as of December 31, 2019 $ 703.5 $ 230.5 $ 552.9 $ 1,486.9 2020 acquisitions (1) 40.3 — 89.2 129.5 Translation adjustment (0.1) 2.1 — 2.0 Balance as of December 31, 2020 743.7 232.6 642.1 1,618.4 Purchase price adjustments — — 0.2 0.2 Translation adjustment (0.1) (1.0) — (1.1) Balance as of March 31, 2021 $ 743.6 $ 231.6 $ 642.3 $ 1,617.5
Schedule of Acquired Intangible Assets	Acquired intangible assets consisted of the following (in millions): March 31, 2021 December 31, 2020 Estimated Useful Life in Years Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer and contractual relationships 7.3 - 12.8 $ 440.9 $ 233.4 $ 207.5 $ 441.3 $ 222.9 $ 218.4 Contractor relationships 4.0 71.1 71.0 0.1 71.2 71.0 0.2 Contract Backlog 1.0 - 2.8 29.3 28.7 0.6 29.3 28.5 0.8 Non-compete agreements 3.0 - 5.0 27.8 19.3 8.5 27.8 18.2 9.6 569.1 352.4 216.7 569.6 340.6 229.0 Not subject to amortization: Trademarks 258.9 — 258.9 258.9 — 258.9 Total $ 828.0 $ 352.4 $ 475.6 $ 828.5 $ 340.6 $ 487.9
Schedule of Estimated Future Amortization Expense	Estimated future amortization expense follows (in millions): Remainder of 2021 $ 35.6 2022 39.1 2023 33.9 2024 26.6 2025 21.5 Thereafter 60.0 $ 216.7

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consisted of the following (in millions): March 31, 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 (7.1) (7.4) $ 1,033.7 $ 1,033.4

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table shows the calculation of basic and diluted earnings per share (in millions, except per share amounts): Three Months Ended March 31, 2021 2020 Net income $ 48.7 $ 43.8 Weighted-average number of common shares outstanding - basic 53.0 52.8 Dilutive effect of share equivalents 0.7 0.5 Number of common shares and share equivalents outstanding - diluted 53.7 53.3 Basic earnings per share $ 0.92 $ 0.83 Diluted earnings per share $ 0.91 $ 0.82 Number of anti-dilutive share equivalents — 0.3

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2021
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	Three Months Ended March 31, 2021 2020 Apex Revenues $ 630.4 $ 629.1 Gross profit 182.0 184.5 Operating income 68.5 67.1 Amortization 5.7 5.3 Oxford Revenues $ 137.5 $ 148.7 Gross profit 54.0 59.3 Operating income 11.3 11.1 Amortization 0.1 0.2 ECS Revenues $ 257.8 $ 212.7 Gross profit 45.0 37.1 Operating income 14.8 11.3 Amortization 6.4 6.6 Consolidated Revenues $ 1,025.7 $ 990.5 Gross profit 281.0 280.9 Operating income (1) 74.8 70.9 Amortization 12.2 12.1 ___________________ (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 Company has three major revenue sources: (i) Assignment, (ii) Consulting and (iii) Federal Government. Permanent placement revenues for full year 2020 were approximately 2.6 percent of total revenues and are no longer significant to our consolidated results for disclosure purposes. Consequently, we no longer present these revenues separately in our financial statements and instead they are included in assignment revenues. For comparability, all prior periods have been recast for this change in presentation. The following table presents disaggregated revenues by type (in millions): Three Months Ended March 31, 2021 2020 Apex Assignment $ 512.8 $ 539.5 Consulting 117.6 89.6 630.4 629.1 Oxford Assignment 117.4 135.5 Consulting 20.1 13.2 137.5 148.7 ECS Firm-fixed-price 60.5 57.0 Time and materials 90.7 72.4 Cost reimbursable 106.6 83.3 257.8 212.7 Consolidated $ 1,025.7 $ 990.5
Revenue from External Customers by Products and Services	The following table presents the ECS Segment (federal government business) revenues by customer type (in millions): Three Months Ended March 31, 2021 2020 Department of Defense and Intelligence Agencies $ 143.3 $ 114.9 Federal Civilian 92.5 84.6 Other 22.0 13.2 $ 257.8 $ 212.7

Acquisitions Business Combinati

Acquisitions Business Combinations Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Acquired Indefinite-lived Intangible Assets [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 0	$ 85.5
2020 Acquisitions
Acquired Indefinite-lived Intangible Assets [Line Items]
Goodwill, Acquired During Period			$ 129.5
Business Acquisition, Goodwill, Expected Tax Deductible Amount			$ 77.1

Business Combinations and Asset

Business Combinations and Asset Acquisitions (Details)	12 Months Ended
	Dec. 31, 2020USD ($)
Business Combination and Asset Acquisition [Abstract]
Payments to Acquire Businesses, Gross	$ 186

Goodwill and Identifiable Ass_3

Goodwill and Identifiable Assets (Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Gross goodwill	$ 1,617.5	$ 1,618.4	$ 1,486.9
Goodwill, Purchase Accounting Adjustments	0.2
Translation adjustment	(1.1)	2
Apex
Goodwill [Roll Forward]
Gross goodwill	743.6	743.7	703.5
Translation adjustment	(0.1)	(0.1)
Oxford
Goodwill [Roll Forward]
Gross goodwill	231.6	232.6	230.5
Translation adjustment	(1)	2.1
ECS
Goodwill [Roll Forward]
Gross goodwill	642.3	642.1	$ 552.9
Goodwill, Purchase Accounting Adjustments	$ 0.2
2020 Acquisitions
Goodwill [Roll Forward]
Goodwill, Acquired During Period		129.5
Business Acquisition, Goodwill, Expected Tax Deductible Amount		77.1
Business Acquisition, Goodwill, Expected Tax Deductible Amount		77.1
2020 Acquisitions | Apex
Goodwill [Roll Forward]
Goodwill, Acquired During Period		40.3
2020 Acquisitions | ECS
Goodwill [Roll Forward]
Goodwill, Acquired During Period		$ 89.2

Goodwill and Identifiable Ass_4

Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Intangible assets subject to amortization:
Gross Carrying Amount	$ 569.1	$ 569.6
Accumulated Amortization	352.4	340.6
Net Carrying Amount	216.7	229
Intangible assets not subject to amortization:
Trademarks, Carrying Amount	258.9	258.9
Intangible Assets, Gross (Excluding Goodwill)	828	828.5
Intangible Assets, Net (Excluding Goodwill), Total	475.6	487.9
Customer and Contractual Relationships
Intangible assets subject to amortization:
Accumulated Amortization	233.4	222.9
Net Carrying Amount	207.5	218.4
Total
Other Finite-Lived Intangible Assets, Gross	$ 440.9	441.3
Customer and Contractual Relationships | Minimum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years 3 months 18 days
Customer and Contractual Relationships | Maximum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years 9 months 18 days
Contractor Relations
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Intangible assets subject to amortization:
Accumulated Amortization	$ 71	71
Net Carrying Amount	0.1	0.2
Total
Other Finite-Lived Intangible Assets, Gross	71.1	71.2
Backlog
Intangible assets subject to amortization:
Accumulated Amortization	28.7	28.5
Net Carrying Amount	0.6	0.8
Total
Other Finite-Lived Intangible Assets, Gross	$ 29.3	29.3
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 18 days
Noncompete Agreements
Intangible assets subject to amortization:
Accumulated Amortization	$ 19.3	18.2
Net Carrying Amount	8.5	9.6
Total
Other Finite-Lived Intangible Assets, Gross	$ 27.8	$ 27.8
Noncompete Agreements | Minimum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Noncompete Agreements | Maximum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years

Goodwill and Identifiable Ass_5

Goodwill and Identifiable Assets (Future Amortization Expense) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Net Carrying Amount	$ 216.7	$ 229
Finite-Lived Intangible Assets, Amortization Expense, Next Rolling Twelve Months	35.6
Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Two	39.1
Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Three	33.9
Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Four	26.6
Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Five	21.5
Finite-Lived Intangible Assets, Amortization Expense, Rolling after Year Five	$ 60

Long-term Debt (Details)

Long-term Debt (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Nov. 22, 2019
Debt Instrument [Line Items]
Senior Notes	$ 550	$ 550	$ 550
Long-term Debt, Gross	1,040.8	1,040.8
Unamortized deferred loan costs	(7.1)	(7.4)
Long-term Debt	$ 1,033.7	1,033.4
leverage ratio	1,130,000
$250 Million Revolving Credit Facility, Due November 2024 [Member]
Debt Instrument [Line Items]
Secured Debt			$ 250
$250 Million Revolving Credit Facility, Due November 2024 [Member] | Minimum [Member] | Bank base rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.25%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.20%
$250 Million Revolving Credit Facility, Due November 2024 [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
$250 Million Revolving Credit Facility, Due November 2024 [Member] | Maximum [Member] | Bank base rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.35%
$250 Million Revolving Credit Facility, Due November 2024 [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Term B Loan Facility, due 2025 [Member] [Domain]
Debt Instrument [Line Items]
Secured Debt	$ 490.8	$ 490.8
Term B Loan Facility, due 2025 [Member] [Domain] | Bank base rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.75%
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.625%
London Interbank Offered Rate (LIBOR) | Term B Loan Facility, due 2025 [Member] [Domain]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020
Other Commitments [Line Items]
Deferred Compensation Liability, Current	$ 14.1	$ 14.4

Revenues (Details)

Revenues (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract with Customer, Liability	$ 14	$ 18.4

Calculation of Basic and Dilute

Calculation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Calculation of Basic and Diluted Earnings per Share [Abstract]
Net income	$ 48.7	$ 43.8
Weighted-average number of common shares outstanding - basic	53	52.8
Dilutive effect of share equivalents	0.7	0.5
Number of common shares and share equivalents outstanding - diluted	53.7	53.3
Basic earnings per share	$ 0.92	$ 0.83
Diluted earnings per share	$ 0.91	$ 0.82
Number of anti-dilutive share equivalents	0	0.3

Segment Reporting (Segment Repo

Segment Reporting (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Revenues	$ 1,025.7	$ 990.5
Gross Profit:
Total Gross Profit	281	280.9
Operating Income (Loss):
Total Operating Income	74.8	70.9
Amortization of intangible assets	12.2	12.1
Apex
Revenues:
Revenues	630.4	629.1
Gross Profit:
Total Gross Profit	182	184.5
Operating Income (Loss):
Total Operating Income	68.5	67.1
Amortization of intangible assets	5.7	5.3
Oxford
Revenues:
Revenues	137.5	148.7
Gross Profit:
Total Gross Profit	54	59.3
Operating Income (Loss):
Total Operating Income	11.3	11.1
Amortization of intangible assets	0.1	0.2
ECS
Revenues:
Revenues	257.8	212.7
Gross Profit:
Total Gross Profit	45	37.1
Operating Income (Loss):
Total Operating Income	14.8	11.3
Amortization of intangible assets	6.4	6.6
Assignment | Apex
Revenues:
Revenues	512.8	539.5
Assignment | Oxford
Revenues:
Revenues	117.4	135.5
Consulting | Apex
Revenues:
Revenues	117.6	89.6
Consulting | Oxford
Revenues:
Revenues	20.1	13.2
Firm-fixed-price | ECS
Revenues:
Revenues	60.5	57
Time and materials | ECS
Revenues:
Revenues	90.7	72.4
Cost reimbursable | ECS
Revenues:
Revenues	$ 106.6	$ 83.3

Segment Reporting Revenue by Cu

Segment Reporting Revenue by Customer Type (details) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from External Customer [Line Items]
Revenues	$ 1,025.7	$ 990.5
Department of Defense and Intelligence Agencies
Revenue from External Customer [Line Items]
Revenues	143.3	114.9
Federal Civilian
Revenue from External Customer [Line Items]
Revenues	92.5	84.6
Other
Revenue from External Customer [Line Items]
Revenues	22	13.2
ECS
Revenue from External Customer [Line Items]
Revenues	$ 257.8	$ 212.7

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Inputs, Liabilities, Quantitative Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Fair Value Inputs, Liabilities, Quantitative Information
Long-term Debt	$ 1,033.7	$ 1,033.4
Business Combination, Contingent Consideration, Liability, Noncurrent	5
Long-term debt, fair value	$ 1,000
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	$ 14.1	$ 14.4