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DEBT - Narrative (Details) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 04, 2020 USD ($) $ / shares | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Feb. 03, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Term loan component of senior credit facility |  |  |  | $ 45,000,000 |  | $ 33,750,000 |
Cost of call transactions |  |  |  | 0 | $ 104,248,000 |  |
Proceeds from warrant transactions |  |  |  | 0 | 44,563,000 |  |
Carrying amount, liability component |  |  |  | 563,697,000 |  | 474,834,000 |
Securitization program outstanding borrowings, maximum limit |  |  |  | 150,000,000 |  |  |
Long-term borrowings under securitization facility |  |  |  | 111,700,000 |  | 0 |
Secured long-term debt, securitization program |  |  |  | $ 111,700,000 |  | $ 112,500,000 |
Weighted average interest rate, accounts receivable securitization revolving loan facility |  |  |  | 1.20% |  | 1.30% |
Fair Value, Inputs, Level 2 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Securitization facility, outstanding borrowings, fair value |  |  |  | $ 108,000,000 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 1,300,000,000
Line of credit facility outstanding |  |  |  | $ 20,000,000 |  | $ 97,500,000 |
Weighted average interest rate on debt |  |  |  | 1.30% |  | 1.50% |
Revolving Credit Facility | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, fair value of amount outstanding |  |  |  | $ 19,300,000 |  |  |
Standby Letters of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 60,000,000
Swingline Loans |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 60,000,000
Senior Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 2,200,000,000
Incremental financing costs capitalized |  |  |  |  |  |  | 4,600,000
Previously capitalized financing costs, written-off |  |  | $ 1,200,000 |  |  |  |
Incremental financing cost expense |  | $ 3,300,000 |  |  |  |  |
Senior Credit Facility | Overnight Federal Funds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rates available |  |  |  | 0.50% |  |  |
Senior Credit Facility | One Month Eurodollar Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rates available |  |  |  | 1.00% |  |  |
Senior Credit Facility | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit, commitment fee percentage |  |  |  | 0.15% |  |  |
Senior Credit Facility | Minimum | Eurodollar |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rates available |  |  |  | 1.00% |  |  |
Senior Credit Facility | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit, commitment fee percentage |  |  |  | 0.30% |  |  |
Senior Credit Facility | Maximum | Eurodollar |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rates available |  |  |  | 2.25% |  |  |
Senior Credit Facility | Standby Letters of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility outstanding |  |  |  | $ 0 |  |  |
Letters of credit outstanding |  |  |  | 1,600,000 |  | $ 1,600,000 |
Term Loan Facility | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 877,500,000
Line of credit facility outstanding |  |  |  | $ 855,000,000 |  | $ 877,500,000 |
Weighted average interest rate on debt |  |  |  | 1.30% |  | 1.50% |
Term loan component of senior credit facility |  |  |  | $ 45,000,000.0 |  |  |
Term Loan Facility | Secured Debt | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, fair value of amount outstanding |  |  |  | 826,600,000 |  |  |
2025 Notes | Convertible Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Incremental financing costs capitalized | $ 13,200,000 |  |  |  |  |  |
Convertible notes, maximum borrowing capacity | $ 575,000,000 |  |  | 575,000,000.0 |  | $ 575,000,000 |
Convertible notes, interest rate | 0.50% |  |  |  |  |  |
Debt proceeds, classified as equity at time of offering | $ 104,500,000 |  |  |  |  |  |
Effective interest rate | 4.20% |  |  |  |  |  |
Initial conversion rate | 13.5739 |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 73.67 |  |  |  |  |  |
Maximum selling price of the company's common stock of the conversion price | 130.00% |  |  |  |  |  |
Maximum average conversion value of notes | 98.00% |  |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |  |
Warrant strike price (in dollars per share) | $ / shares | $ 113.34 |  |  |  |  |  |
Carrying amount, liability component |  |  |  |  |  | 485,900,000 |
Unamortized discount |  |  |  |  |  | $ 89,100,000 |
Fair value |  |  |  | 636,700,000 |  |  |
Cash interest |  |  |  | $ 2,100,000 |  |  |
2025 Notes | Convertible Debt | Call Option |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Cost of call transactions | $ 104,200,000 |  |  |  |  |  |
Proceeds from warrant transactions | $ 44,500,000 |  |  |  |  |  |
Initial strike price (in dollars per share) | $ / shares | $ 73.67 |  |  |  |  |  |
2020 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Incremental financing cost expense |  |  |  |  | 11,100,000 |  |
Cash interest |  |  |  |  | 1,900,000 |  |
Interest expense |  |  |  |  | $ 13,000,000 |  |

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- Definition Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69E -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495743-112612 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69F -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495745-112612 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph 8 -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Definition Carrying value as of the balance sheet date of the portion of long-term, collateralized debt obligations due within one year or the operating cycle, if longer. Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(1)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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