CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities:
Net income	$ 135.4	$ 111.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	68.8	71.3
Stock-based compensation	31.1	22.4
Allowance for doubtful accounts	3.0	2.1
Workers’ compensation provision	2.3	2.5
Other	6.8	13.0
Changes in operating assets and liabilities:
Accounts receivable	(30.3)	(47.8)
Prepaid expenses and income taxes	(1.9)	12.5
Accounts payable	(17.9)	9.9
Accrued payroll and contract professional pay	25.1	26.9
Income taxes payable	15.5	6.8
Workers’ compensation loss reserves	(2.4)	(2.3)
Operating lease right of use assets	20.9	0.0
Operating lease liabilities	(21.3)	0.0
Other	(3.3)	(5.5)
Net Cash Provided by Operating Activities	231.8	223.6
Cash Flows from Investing Activities:
Cash paid for property and equipment	(22.8)	(22.1)
Cash paid for acquisitions, net of cash acquired	(48.5)	(760.3)
Other	(0.1)	(0.1)
Net cash used in investing activities	(71.4)	(782.5)
Cash Flows from Financing Activities:
Proceeds from long-term debt	59.0	822.0
Principal payments of long-term debt	(178.0)	(231.0)
Payments of Debt Issuance Costs	0.0	22.5
Proceeds from option exercises and employee stock purchase plan	12.7	9.3
Payment of employment taxes related to release of restricted stock awards	(7.7)	(4.4)
Payments for Repurchase of Common Stock	(20.0)	0.0
Proceeds from (Payments for) Other Financing Activities	0.0	(9.5)
Net Cash provided by (used in) Financing Activities	(134.0)	563.9
Effect of exchange rate changes on cash and cash equivalents	(0.7)	(0.8)
Net Increase (Decrease) in Cash and Cash Equivalents	25.7	4.2
Cash and Cash Equivalents at Beginning of Year	41.8	36.7
Cash and Cash Equivalents at End of Period	67.5	40.9
Supplemental Disclosure of Cash Flow Information:
Income taxes	36.6	10.2
Interest	37.0	37.8
Supplemental Disclosure of Non-Cash Transactions:
Unpaid portion of additions to property and equipment	$ 1.1	$ 1.7

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Amount of cash inflow (outflow) from financing activities classified as other.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Name Accounting Standards Codification
-Topic 230
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 50
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-Section S99
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-Subparagraph (SX 210.5-03(5))
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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of noncash expense for share-based payment arrangement.

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No definition available.

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