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Debt and Credit Arrangements - Senior Secured Revolving Credit Facility and Term Loan (Details) - USD ($) |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 20, 2020 | Jun. 14, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt Instrument |  |  |  |  |
Payments for debt issuance costs |  |  | $ 0 | $ 1,900,000 |
Revolving Credit Facility | Credit Facilities 2019 |  |  |  |  |
Debt Instrument |  |  |  |  |
Maximum percentage of capital stock guaranteed by company |  |  | 65.00% |  |
Unamortized debt issuance costs |  |  | $ 4,300,000 |  | $ 5,000,000.0
Revolving Credit Facility | Credit Facilities 2019 | Adjusted Base Rate | Minimum |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument variable interest rate (percent) |  | 0.25% |  |  |
Revolving Credit Facility | Credit Facilities 2019 | Adjusted Base Rate | Maximum |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument variable interest rate (percent) |  | 1.50% |  |  |
Revolving Credit Facility | Credit Facilities 2019 | LIBOR | Minimum |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument variable interest rate (percent) |  | 1.25% |  |  |
Revolving Credit Facility | Credit Facilities 2019 | LIBOR | Maximum |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument variable interest rate (percent) |  | 2.50% |  |  |
Revolving Credit Facility | Senior secured revolving credit facility |  |  |  |  |
Debt Instrument |  |  |  |  |
Maximum borrowing capacity |  | $ 550,000,000.0 |  |  |
Payments for debt issuance costs | $ 1,900,000 |  | 11,900,000 |  |
Unamortized debt issuance costs |  |  | 6,700,000 |  |
Revolving Credit Facility | Term loan |  |  |  |  |
Debt Instrument |  |  |  |  |
Principal amount |  | $ 450,000,000.0 |  |  |
Debt issuance costs |  |  | $ 6,100,000 |  |
Debt issuance cost, amortization term |  |  | 5 years |  |

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