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Long-Term Debt - Credit Facility (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 08, 2019 | Apr. 30, 2018 | Mar. 31, 2018 | Feb. 28, 2018
Credit Facility |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Letter of credit outstanding | $ 12.4 |  |  |  |  |  |
Debt instrument, variable rate (percentage) | 2.40% |  |  |  |  |  |
Debt instrument weighted average interest rate (percent) | 2.70% | 4.30% |  |  |  |  |
Current borrowing capacity | $ 444.1 |  |  |  |  |  |
Undrawn capacity under revolving credit facility | 844.6 |  |  |  |  |  |
Issuance costs |  |  |  | $ 6.4 |  |  | $ 3.3
Maximum borrowing capacity | 1,250.0 |  |  |  | $ 1,250.0 | $ 1,100.0 |
Contingent increase in borrowing capacity | $ 250.0 |  |  |  |  |  |
Line of credit facility, commitment fee (percent) | 0.375% |  |  |  |  |  |
Commitment fee amount | $ 2.0 | $ 1.9 | $ 2.1 |  |  |  |
Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Debt instrument, variable rate (percentage) | 2.00% |  |  |  |  |  |
Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Debt instrument, variable rate (percentage) | 2.75% |  |  |  |  |  |
Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Debt instrument, variable rate (percentage) | 1.00% |  |  |  |  |  |
Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Debt instrument, variable rate (percentage) | 1.75% |  |  |  |  |  |
Credit Facility | Federal Funds Rate |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Debt instrument, interest margin added to variable rate | 0.50% |  |  |  |  |  |
Credit Facility | One-month LIBOR |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Debt instrument, interest margin added to variable rate | 1.00% |  |  |  |  |  |
Letters of Credit, Credit Facility |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 50.0 | $ 25.0 |
Swing Line Loans, Credit Facility |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Maximum borrowing capacity | $ 50.0 |  |  |  |  |  |

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- Definition The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount. + References No definition available. + 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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- Definition Amount of the fee for available but unused credit capacity under the credit facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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