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Distributions Paid and Payable (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2017
$ / shares
shares
Mar. 31, 2017
$ / shares
shares
Feb. 28, 2017
$ / shares
Jan. 31, 2017
$ / shares
Mar. 31, 2016
$ / shares
Feb. 29, 2016
$ / shares
Jan. 31, 2016
$ / shares
Mar. 31, 2017
USD ($)
item
$ / shares
Mar. 31, 2016
USD ($)
item
$ / shares
Common stock                  
Issuance of common stock                  
Dividends paid per common share (in dollars per share)   $ 0.2105000 $ 0.2105000 $ 0.2025000 $ 0.1985000 $ 0.1985000 $ 0.1910000 $ 0.6235000 $ 0.5880000
Monthly distributions payable (in dollars per share)   0.211           0.211  
Class F Preferred Stock                  
Issuance of common stock                  
Monthly distributions payable (in dollars per share)   $ 0.101215           $ 0.101215  
Period for which dividends are paid | item               3 3
Dividends paid per preferred share (in dollars per share)               $ 0.414063 $ 0.414063
Preferred stock dividends paid | $               $ 3.9 $ 6.8
Preferred stock redeemed (in shares) | shares 16,350,000 16,350,000              
Preferred stock, redemption price per share (in dollars per share) $ 25 $ 25           $ 25