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Capital Disclosure of investment grade credit rating (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Investment [Line Items] |  |
Comparable funds from operations to adjusted interest coverage, actual | 4.5 | 4.8
Adjusted comparable funds from operations to adjusted net debt, actual | 19.00% | 20.80%
Adjusted net debt to comparable earnings before interest, taxes, depreciation, and amortization, actual | 3.9 | 3.6
Percentage of dividends added to Comparable FFO before Interest to Adjusted Interest Coverage | 50.00% |
Percentage of preferred dividends deducted from Adjusted Comparable FFO to Adjusted Net Debt | 50.00% |
Percentage of preferred shares added to net debt in Adjusted Comparable FFO to Adjusted Net Debt | 50.00% |
Minimum |  |
Investment [Line Items] |  |
Comparable funds from operations to adjusted interest coverage, Target | 4 |
Adjusted comparable funds from operations to adjusted net debt, Target | 20 |
Adjusted net debt to comparable earnings before interest, taxes, depreciation, and amortization, Target | 3.0 |
Maximum |  |
Investment [Line Items] |  |
Comparable funds from operations to adjusted interest coverage, Target | 5 |
Adjusted comparable funds from operations to adjusted net debt, Target | 25 |
Adjusted net debt to comparable earnings before interest, taxes, depreciation, and amortization, Target | 3.5 |

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- Definition Line items represent reporting 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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