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Equity and Capital (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Noncontrolling Interest [Line Items]          
Common stock authorized for sale under the ATM $ 400.0        
Common stock remained available for issuance under the ATM $ 400.0   $ 400.0    
Dividends, per common share $ 0.225 $ 0.200 $ 0.675 $ 0.60  
OP Units [Member]          
Noncontrolling Interest [Line Items]          
Dividends, per common share $ 0.225 $ 0.20 $ 0.45 $ 0.40  
Ownership percentage by parent 1.91%   1.91%   2.54%
Conversion of units in shares     1.9    
Accounts Payable and Accrued Liabilities [Member]          
Noncontrolling Interest [Line Items]          
Dividends payable $ 69.7   $ 69.7   $ 68.8
Accounts Payable and Accrued Liabilities [Member] | OP Units [Member]          
Noncontrolling Interest [Line Items]          
Dividends payable $ 69.4   $ 69.4   $ 68.8