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Debt and Credit Arrangements - Summary of Outstanding Borrowings (Details) € in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 EUR (€) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Nov. 06, 2017 USD ($)
Debt Instrument |  |  |  |  |  |  |  |
Total debt, net of unamortized debt issuance costs | $ 922,800,000 |  | $ 922,800,000 |  |  | $ 856,700,000 |  |
Less: current maturities | 256,400,000 |  | 256,400,000 |  |  | 255,900,000 |  |
Long-term debt | 666,400,000 |  | 666,400,000 |  |  | 600,800,000 |  |
Foreign currency transaction gain | 1,700,000 | $ (900,000) | 100,000 | $ (900,000) |  |  |  |
Convertible Notes, due 2024 | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Principal amount | 258,800,000 |  | 258,800,000 |  |  | 258,800,000 |  | $ 258,800,000
Unamortized debt issuance costs | (2,400,000) |  | (2,400,000) |  |  | (2,900,000) |  |
Convertible Debt | 256,400,000 |  | 256,400,000 |  |  | 255,900,000 |  |
Debt instrument stated interest rate (percent) |  |  |  |  |  |  |  | 1.00%
Revolving Credit Facility | Senior secured revolving credit facility due October 2026 |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Long term debt, gross | $ 666,400,000 |  | $ 666,400,000 |  |  | $ 600,800,000 |  |
Debt instrument stated interest rate (percent) | 2.60% |  | 2.60% |  | 2.60% | 2.10% | 2.10% |
Letters of credit outstanding | $ 61,400,000 |  | $ 61,400,000 |  |  |  |  |
Line of credit remaining borrowing amount | 272,200,000 |  | 272,200,000 |  |  |  |  |
Revolving Credit Facility | Euro senior secured revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Long term debt, gross | 91,400,000 |  | 91,400,000 |  | € 88.0 | $ 88,300,000 | € 78.0 |
Foreign currency transaction gain | $ 5,700,000 | $ 8,900,000 | $ 6,600,000 | $ 5,000,000.0 |  |  |  |

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