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Debt and Credit Arrangements - Senior Secured Revolving Credit Facility and Term Loan (Details) - Revolving Credit Facility - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 14, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Credit Facilities 2024 |  |  |
Debt Instrument |  |  |
Maximum percentage of capital stock guaranteed by company |  | 65.00% |
Unamortized debt issuance costs |  | $ 5,000,000.0 | $ 5,500,000
Credit Facilities 2024 | LIBOR | Minimum |  |  |
Debt Instrument |  |  |
Debt instrument variable rate (percent) | 1.25% |  |
Credit Facilities 2024 | LIBOR | Maximum |  |  |
Debt Instrument |  |  |
Debt instrument variable rate (percent) | 2.25% |  |
Credit Facilities 2024 | Adjusted Base Rate | Minimum |  |  |
Debt Instrument |  |  |
Debt instrument variable rate (percent) | 0.25% |  |
Credit Facilities 2024 | Adjusted Base Rate | Maximum |  |  |
Debt Instrument |  |  |
Debt instrument variable rate (percent) | 1.25% |  |
Senior secured revolving credit facility |  |  |
Debt Instrument |  |  |
Maximum borrowing capacity | $ 550,000,000.0 |  |
Payments of debt issuance costs |  | 11,100,000 |
Unamortized debt issuance costs |  | 7,800,000 | 9,500,000
Term long due June 2024 |  |  |
Debt Instrument |  |  |
Maximum borrowing capacity | $ 450,000,000.0 |  |
Debt issuance costs |  | $ 7,000,000.0 | 6,100,000
Debt issuance cost, amortization term (term) |  | 5 years |
Unamortized debt issuance costs |  | $ 5,000,000.0 | $ 5,500,000

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