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TREASURY STOCK - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Feb. 05, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 07, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock (in shares) | 4.9 | 4.9 |  |  | 4.9 |  | 4.9 |
Treasury stock | $ 234,400,000 | $ 235,100,000 |  |  | $ 234,400,000 |  | $ 235,100,000 |
Treasury stock, average cost per share (in dollars per share) | $ 47.86 | $ 47.86 |  |  |  |  |  |
Stock repurchase program, authorized amount (up to) |  |  |  |  |  |  |  | $ 225,000,000
Stock repurchased during period (in shares) |  |  | 1.3 | 0.6 |  |  | 2.1 |
Net proceeds from offering of convertible senior notes |  |  |  |  | $ 0 | $ 575,000,000 |  |
Accelerated share repurchase program, payment |  |  | $ 92,400,000 |  |  |  |  |
Accelerated share repurchases, remaining share repurchases expected to be completed, value |  |  | $ 100,000,000 |  |  |  |  |
Accelerated share repurchases, percentage of expected total repurchased |  |  | 80.00% |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Net proceeds from offering of convertible senior notes |  |  |  |  |  |  | $ 100,000,000 |
Convertible Debt | Certain Purchasers |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Net proceeds from offering of convertible senior notes |  |  |  |  |  |  | $ 7,600,000 |

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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + 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 (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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