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Financing (Unsecured Revolving Credit Facility) (Narrative) (Details) - Revolving Credit Facility [Member] - Unsecured debt [Member] - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Financing |  |
Credit agreement inception date | Apr. 05, 2017 |
Current maximum borrowing capacity under credit facility | $ 1,200.0 |
Maximum aggregate increase to credit facility allowable | 600.0 |
Maximum aggregate capacity of credit facility allowable | 1,800.0 |
Letters of credit | $ 39.1 | $ 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 at any time the credit facility may be increase to at the Company's option. + 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 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=6877327&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=6877327&loc=d3e13212-122682 + Details
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