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Debt and Credit Arrangements - Senior Secured Revolving Credit Facility and Term Loan (Details) - USD ($) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 20, 2020 | Jun. 14, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Debt Instrument |  |  |  |  |
Payments for debt issuance costs |  |  | $ 1,000,000.0 | $ 13,600,000 |
Revolving Credit Facility | Credit Facilities 2019 |  |  |  |  |
Debt Instrument |  |  |  |  |
Maximum percentage of capital stock guaranteed by company |  |  | 65.00% |  |
Unamortized debt issuance costs |  |  | $ 5,400,000 |  | $ 5,500,000
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 |  |  | 8,400,000 |  |
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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- Definition Maximum Percentage Of Capital Stock Guaranteed By Companys Material Non US Subsidiaries For Obligations Under The Senior Credit Facility + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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