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Commitments (Commitments) (Narrative) (Details) $ in Millions | Dec. 31, 2020 USD ($) D | Dec. 31, 2019 USD ($)
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Senior notes [Member] |  |
Commitments |  |
Debt instrument minimum number of days callable | D | 30 |
Debt instrument maximum number of days callable | D | 60 |
Percentage principal amount of debt that can be redeemed by the Company | 100.00% |
Percentage principal amount of debt redeemable upon change in control | 101.00% |
Revolving Credit Facility [Member] | Unsecured debt [Member] |  |
Commitments |  |
Letters of credit | $ | $ 66.4 | $ 38.9
Construction [Member] |  |
Commitments |  |
Construction commitments | $ | $ 38.3 |

X
- Definition As described in the Indenture governing the notes, the fewest number of days notice the Company must give to call the notes. + References No definition available. + Details
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X
- Definition As described in the Indenture governing the notes, the maximum number of days notice the Company must give to call the notes. + References No definition available. + Details
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- Definition The percentage of the principal amount of the debt instrument that can be redeemed upon a change in control triggering event. + References No definition available. + Details
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- Definition The percentage of the principal amount of the debt instrument that can be redeemed at the option of the Company. + 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 Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations. + References Reference 1: 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(17)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 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(a)(19)) -URI http://asc.fasb.org/extlink&oid=120400017&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(25)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Details
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- Details
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