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Debt and Credit Arrangements - Summary of Outstanding Borrowings (Details) € in Millions | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 EUR (€) | Jan. 01, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Jun. 14, 2019 USD ($) | Nov. 06, 2017 USD ($)
Debt Instrument |  |  |  |  |  |  |  |  |  |
Total debt, net of unamortized discount and debt issuance costs | $ 706,100,000 |  | $ 706,100,000 |  |  |  | $ 442,500,000 |  |  |
Less: current maturities | 255,500,000 |  | 255,500,000 |  |  |  | 220,900,000 |  |  |
Long-term debt | 450,600,000 |  | 450,600,000 |  |  |  | 221,600,000 |  |  |
Foreign currency transaction gain | (1,700,000) | $ (1,200,000) | (1,500,000) | $ (1,500,000) |  |  |  |  |  |
Convertible Notes, due 2024 | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs | (3,300,000) |  | (3,300,000) |  |  | $ (3,900,000) | (3,100,000) |  |  |
Principal amount | 258,800,000 | $ 258,800,000 | 258,800,000 | $ 258,800,000 |  |  | 258,800,000 |  |  | $ 258,800,000
Unamortized discount | 0 |  | 0 |  |  |  | (34,800,000) |  |  |
Convertible Debt | 255,500,000 |  | 255,500,000 |  |  |  | 220,900,000 |  |  |
Debt instrument stated interest rate (percent) |  |  |  |  |  |  |  |  |  | 1.00%
Revolving Credit Facility | Credit Facilities 2019 |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs | (4,300,000) |  | (4,300,000) |  |  |  | (5,000,000.0) |  |  |
Senior secured revolving credit facility and term loan, net of debt issuance costs | 450,600,000 |  | 450,600,000 |  |  |  | 221,600,000 |  |  |
Revolving Credit Facility | Term loan |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Long term debt | $ 103,100,000 |  | $ 103,100,000 |  |  |  | $ 103,100,000 |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 450,000,000.0 |
Debt instrument stated interest rate (percent) | 2.00% |  | 2.00% |  | 2.00% |  | 2.50% | 2.50% |  |
Revolving Credit Facility | Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Long term debt | $ 351,800,000 |  | $ 351,800,000 |  |  |  | $ 123,500,000 |  |  |
Unamortized debt issuance costs | $ (6,700,000) |  | $ (6,700,000) |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 550,000,000.0 |
Weighted average interest rate (percent) | 1.90% |  | 1.90% |  | 1.90% |  | 2.10% | 2.10% |  |
Letters of credit outstanding | $ 45,200,000 |  | $ 45,200,000 |  |  |  |  |  |  |
Line of credit remaining borrowing amount | 153,000,000.0 |  | 153,000,000.0 |  |  |  |  |  |  |
Revolving Credit Facility | Euro senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Long term debt | 102,800,000 |  | 102,800,000 |  | € 86.5 |  | $ 91,400,000 | € 74.5 |  |
Foreign currency transaction gain | 8,900,000 |  | 5,000,000.0 |  |  |  |  |  |  |
Revolving Credit Facility Sub-limit - Letters of Credit | Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 100,000,000.0 |  | 100,000,000.0 |  |  |  |  |  |  |
Revolving Credit Facility Sub-limit - Discretionary Letters of Credit | Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 250,000,000.0 |  | 250,000,000.0 |  |  |  |  |  |  |
Revolving Credit Facility Sub-limit - Swingline | Senior secured revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 50,000,000.0 |  | $ 50,000,000.0 |  |  |  |  |  |  |

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