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Shareholders' Equity - Dividends Declared (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2019
Jul. 09, 2019
Apr. 03, 2019
Feb. 04, 2019
Oct. 15, 2018
Jul. 10, 2018
Apr. 11, 2018
Feb. 05, 2018
Dividends Payable [Line Items]                
Minimum percentage of taxable income to be distributed as REIT 90.00%              
Dividend Paid                
Dividends Payable [Line Items]                
Distribution Per Share (USD per share)   $ 0.48 $ 0.48 $ 0.48 $ 0.47 $ 0.47 $ 0.47 $ 0.47
Aggregate Payment Amount   $ 58.2 $ 58.2 $ 57.9 $ 57.2 $ 57.2 $ 57.4 $ 58.3