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Financing (Unsecured Revolving Credit Facility) (Narrative) (Details) - Revolving Credit Facility [Member] - Unsecured debt [Member] - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Financing |  |
Credit agreement inception date | Apr. 05, 2017 |
Line of credit, current borrowing capacity | $ 1,200.0 |
Current maximum borrowing capacity under credit facility | 1,800.0 |
Maximum aggregate increase to credit facility allowable | 600.0 |
Letters of credit | $ 66.5 | $ 38.9
Line of credit facility fee percentage | 0.10% |
Spread over Alternate Base rate [Member] |  |
Financing |  |
Line of credit current interest rate | 0.00% |
Spread over Eurodollar Revolving rate [Member] |  |
Financing |  |
Line of credit current interest rate | 0.90% |
Through maturity [Member] |  |
Financing |  |
Minimum debt instrument consolidated fixed charge coverage ratio covenant | 2.50 |
Maximum debt instrument consolidated leverage ratio covenant | 3.50 |
Letter of credit [Member] |  |
Financing |  |
Line of credit facility sublimit | $ 200.0 |
Swing line revolver [Member] |  |
Financing |  |
Line of credit facility sublimit | $ 75.0 |

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- Definition The minimum fixed charge coverage ratio the Company is required to maintain in order to be in compliance with the covenant clauses of the debt agreement. + References No definition available. + Details
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- Definition The maximum consolidated leverage ratio the Company is required to remain below in order to maintain compliance with the covenant clauses of the debt agreement. + References No definition available. + Details
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- Definition The maximum aggregate amount the credit facility may be increased by at the Company's option. + References No definition available. + Details
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- Definition A restriction on the borrowing capacity of the line of credit facility. The restriction places a sublimit on the amount that can be borrowed for specific purposes. + References No definition available. + Details
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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 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 The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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 Date the credit facility first became available, in CCYY-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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