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FINANCING ARRANGEMENTS - Convertible Senior Notes (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2021 | Apr. 30, 2021 | May 31, 2016 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Apr. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 0 | $ 5,090,000 | $ 0 | $ 5,090,000 |  |  |
Cost of convertible note hedges |  |  | $ 59,100,000 |  |  |  |  |  |  |
Proceeds from Issuance of Warrants |  |  | $ 35,500,000 |  |  |  |  |  |  |
Cash received on hedges | $ 2,300,000 |  |  |  |  |  |  |  |  |
Settlement of cash paid for warrants | 1,300,000 |  |  |  |  |  |  |  |  |
3.25% Convertible Senior Notes due 2022 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 3.25%
Principal amount |  |  |  |  |  |  |  |  |  | $ 250,000,000
Aggregate purchase price | 255,000,000 |  |  |  |  |  |  |  |  |
Repurchased debt outstanding principal amount | 250,000,000 |  |  |  |  |  |  |  |  |
Accrued and unpaid interest | 1,000,000 |  |  |  |  |  |  |  |  |
Debt repurchase prepayment penalty | 4,000,000 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ 5,100,000 |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  | 3.76% |  | 3.76% |  |  |  |
1.125% Convertible Senior Notes Due 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 1.125% |  |  |  |  |  |  |  |
Principal amount |  | $ 230,000,000 |  | $ 230,000,000 |  | $ 230,000,000 |  | $ 230,000,000 |  |
Net proceeds from issuance of debt |  | $ 222,100,000 |  |  |  |  |  |  |  |
Proceeds from debt used for capped call transactions payment |  |  |  | 27,400,000 |  | 27,400,000 |  |  |  |
Debt issuance costs |  |  |  | $ 7,800,000 |  | $ 7,800,000 |  |  |  |
Effective interest rate |  |  |  | 1.83% |  | 1.83% |  |  |  |
Fair value of debt |  |  |  | $ 156,200,000 |  | $ 156,200,000 |  | $ 183,300,000 |  |
Conversion price (in usd per share) |  |  |  |  |  |  |  |  | $ 68.12 |
Debt conversion price, premium on stock price |  | 100.00% |  |  |  |  |  |  |  |
1.125% Convertible Senior Notes Due 2026 | Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion price (in usd per share) |  | $ 104.80 |  |  |  |  |  |  |  |

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