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TREASURY STOCK - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 05, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 11, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock (in shares) |  |  |  |  | 4.9 |  | 2.9 |
Treasury stock |  |  |  |  | $ 235,200,000 |  | $ 119,900,000 |
Treasury stock, average cost per share (in dollars per share) |  |  |  |  | $ 47.86 |  | $ 41.87 |
Stock repurchase program, authorized amount (up to) |  |  |  |  |  |  |  | $ 225,000,000.0
Stock repurchased during period (in shares) | 1.3 | 0.6 |  |  | 2.1 |  |  |
Net proceeds from offering of convertible senior notes |  |  |  |  | $ 575,000,000 | $ 0 |  |
Accelerated share repurchase program, payment | $ 92,400,000 |  |  |  |  |  |  |
Accelerated shares repurchased, amount | $ 100,000,000.0 |  | $ 0 | $ 92,368,000 |  |  |  |
Accelerated share repurchases, percentage of expected total repurchased | 80.00% |  |  |  |  |  |  |
Remaining amount under share repurchase |  |  |  |  | 125,000,000.0 |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Net proceeds from offering of convertible senior notes |  |  |  |  | 100,000,000.0 |  |  |
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=121586364&loc=d3e3255-108585 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: 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(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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