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Capital Disclosure of investment grade credit rating (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Investment [Line Items]    
Comparable funds from operations to adjusted interest coverage, actual 4.2 4.5
Adjusted comparable funds from operations to adjusted net debt, actual 18.30% 19.00%
Adjusted net debt to comparable earnings before interest, taxes, depreciation, and amortization, actual 3.9 3.9
Deconsolidated net debt to deconsolidated comparable EBITDA, actual 460.00% 420.00%
Percentage of dividends added to comparable FFO before Interest to adjusted interest coverage 50.00%  
Percentage of preferred shares added to net debt in Adjusted Comparable FFO to Adjusted Net Debt 50.00%  
Percentage of preferred shares added to net debt in Adjusted Comparable Funds From EBITDA to Adjusted Net Debt Ratio 50.00%  
Minimum    
Investment [Line Items]    
Range of times to maintain percentage of dividends added to comparable FFO before Interest to adjusted interest coverage, as a multiple 4  
Percentage of preferred dividends deducted from Adjusted Comparable Funds From Operations to Adjusted Net Debt Ratio, Range to Maintain 2000.00%  
Percentage of preferred shares added to net debt in Adjusted Comparable Funds From Operations to Adjusted Net Debt Ratio, Range to Maintain 3.0  
Percentage of preferred shares added to net debt in Adjusted Comparable Funds From EBITDA to Adjusted Net Debt Ratio, Range To Maintain Expressed As A Multiple 2.5  
Maximum    
Investment [Line Items]    
Range of times to maintain percentage of dividends added to comparable FFO before Interest to adjusted interest coverage, as a multiple 5  
Percentage of preferred dividends deducted from Adjusted Comparable Funds From Operations to Adjusted Net Debt Ratio, Range to Maintain 2500.00%  
Percentage of preferred shares added to net debt in Adjusted Comparable Funds From Operations to Adjusted Net Debt Ratio, Range to Maintain 3.5  
Percentage of preferred shares added to net debt in Adjusted Comparable Funds From EBITDA to Adjusted Net Debt Ratio, Range To Maintain Expressed As A Multiple 3.0