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Debt - Credit Facility - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2018 | Sep. 30, 2021
Debt Instrument [Line Items] |  |
Maximum borrowing capacity |  | $ 900.0
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity |  | $ 300.0
Maturity date |  | Jun. 29, 2025
Capitalized costs |  | $ 2.7
Term Loan |  |
Debt Instrument [Line Items] |  |
Capitalized costs |  | 3.1
Term Loan | Third party |  |
Debt Instrument [Line Items] |  |
Capitalized costs |  | $ 0.1
$400 Million Term Loan |  |
Debt Instrument [Line Items] |  |
Maturity date |  | Jun. 29, 2026
Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity |  | $ 700.0
Maturity date |  | Mar. 31, 2023
Unsecured Debt | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 250.0 | $ 50.0
Basis spread on variable rate | 1.40% | 1.40%
Maturity date | Mar. 31, 2022 |
Unsecured Debt | Term Loan |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity |  | $ 50.0
Unsecured Debt | $300 Million Term Loan |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 350.0 |
Basis spread on variable rate | 1.30% |
Unsecured Debt | $300 Million Term Loan | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity |  | 300.0
Unsecured Debt | $400 Million Term Loan |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity |  | $ 400.0
Basis spread on variable rate |  | 1.55%
Unsecured Debt | $400 Million Term Loan | Term Loan |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity |  | $ 400.0

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition Date the credit facility terminates, in YYYY-MM-DD format. + 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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- 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. + 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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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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