Long-term Debt (Details) $ in Millions |
Oct. 01, 2020
USD ($)
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Sep. 30, 2021
USD ($)
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Dec. 31, 2020
USD ($)
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Dec. 31, 2019
USD ($)
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Jul. 31, 2018
USD ($)
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Sep. 20, 2017
USD ($)
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| Debt Instrument [Line Items] | ||||||
| Unamortized debt issuance cost | $ 1.4 | $ 0.9 | ||||
| Maximum total net leverage ratio | 3.5 | 3.5 | ||||
| Minimum fixed charge coverage ratio | 1.25 | 1.25 | ||||
| Minimum | ||||||
| Debt Instrument [Line Items] | ||||||
| Percentage of commitment fee payable periodically | 0.25% | |||||
| Maximum | ||||||
| Debt Instrument [Line Items] | ||||||
| Percentage of commitment fee payable periodically | 0.40% | |||||
| New Revolving Credit Facility | ||||||
| Debt Instrument [Line Items] | ||||||
| Aggregate principal amount | $ 150.0 | |||||
| Outstanding amount | $ 0.0 | $ 22.0 | ||||
| New Revolving Credit Facility | LIBOR | ||||||
| Debt Instrument [Line Items] | ||||||
| Line of credit facility bears interest (as a percent) | 2.25% | |||||
| Letter of Credit | ||||||
| Debt Instrument [Line Items] | ||||||
| Maximum borrowing capacity | $ 15.0 | $ 5.0 | $ 3.0 |
| X | ||||||||||
- Definition Represents the ratio of maximum total leverage under the line of credit facility. No definition available.
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- Definition Represents the ratio of minimum fixed charge coverage under the line of credit facility. No definition available.
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. No definition available.
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- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. No definition available.
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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