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v3.20.4

Long-term Debt Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Amortization of financing costs and discounts |  | $ 2.0 | $ 2.0 | $ 1.0 |
Long-term Debt, Gross |  | 351.0 | $ 351.0 |  |
Debt, weighted average interest rate |  |  | 4.90% |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 200.0 |  |  | $ 550.0
Proceeds from Lines of Credit |  | 350.0 |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost | $ 350.0 |  |  |  |
Senior unsecured notes, maturing 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fair value of debt |  | 360.0 | $ 362.0 |  |
Amount of loan issuance |  | 350.0 |  |  |
Long-term Debt, Gross |  | $ 350.0 | $ 350.0 |  |
Debt, interest rate, stated percentage |  | 4.875% |  |  |
Senior unsecured notes, maturing 2024 | Amended Credit Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 550.0 |  |  |
Senior unsecured notes, maturing 2024 | Letter of Credit | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 60.0 |  |  |
Base Rate | Minimum | Revolving A Loans | Amended Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.875% |  |  |
Base Rate | Minimum | Revolving B Loans | Amended Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.125% |  |  |
Base Rate | Maximum | Revolving A Loans | Amended Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.00% |  |  |
Base Rate | Maximum | Revolving B Loans | Amended Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.25% |  |  |
London Interbank Offered Rate (LIBOR) | Minimum | Revolving A Loans | Amended Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.875% |  |  |
London Interbank Offered Rate (LIBOR) | Minimum | Revolving B Loans | Amended Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.125% |  |  |
London Interbank Offered Rate (LIBOR) | Maximum | Revolving A Loans | Amended Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 3.00% |  |  |
London Interbank Offered Rate (LIBOR) | Maximum | Revolving B Loans | Amended Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 3.25% |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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