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Debt - Debt Issuance Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Capitalized deferred debt issuance costs |  |  | $ 3.6
Write off of deferred debt issuance costs |  |  | $ 0.5
Deferred debt issuance costs | $ 4.6 | $ 5.9 |
Expected Future Amortization Expense [Abstract] |  |  |
2021 | 1.3 |  |
2022 | 1.3 |  |
2023 | 1.1 |  |
2024 | 0.4 |  |
2025 | 0.4 |  |
Thereafter | 0.1 |  |
Total | 4.6 | 5.9 |
Interest expense |  |  |
Debt Instrument [Line Items] |  |  |
Amortization expense | $ 1.3 | $ 1.2 |

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- Definition Deferred Debt Issuance Costs, Expected Future Amortization Expense in Next Twelve Months + References No definition available. + Details
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- Definition Deferred Debt Issuance Costs, Expected Future Amortization Expense in Year Three + References No definition available. + Details
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- Definition Deferred Debt Issuance Costs, Expected Future Amortization Expense in Year Two + References No definition available. + Details
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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -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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- 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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