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Credit Facility (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs | $ 212.2 |  | $ 212.2 |  | $ (8.7)
Line of Credit Facility, Maximum Borrowing Capacity | 57.0 |  | 57.0 |  |
Letters of Credit Outstanding, Amount | 0.7 |  | 0.7 |  | 0.7
Line of Credit [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Unamortized Debt Issuance Expense | 12.8 |  | 12.8 |  | 8.7
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs | 212.2 |  | 212.2 |  | $ (8.7)
Line of Credit Facility, Maximum Borrowing Capacity | 2,750.0 |  | 2,750.0 |  |
Line of Credit Facility, Average Outstanding Amount | $ 497.1 | $ 758.9 | $ 432.5 | $ 1,014.3 |
Pricing on the Facility based on market rates |  |  | LIBOR plus 0.875% to 1.35% |  |
Description of Variable Rate Basis |  |  | LIBOR |  |
Basis spread on variable rate (in hundredths) |  |  | 0.95% |  |
Line of Credit Facility, Interest Rate During Period | 1.00% | 1.10% | 1.00% | 1.60% |

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- Definition Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs + References No definition available. + Details
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Balance Type: | credit
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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 Description of reference rate used for variable rate of debt instrument. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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- Definition Description of interest rate for borrowing under credit facility. Includes, but is not limited to, terms and method for determining interest rate. + 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 effective interest rate during the reporting period. + 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 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 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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- Details
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