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Equity - Dividend Reinvestment and Stock Purchase Plan (Details) - USD ($)
$ in Millions
6 Months Ended 64 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Equity      
Authorized common shares to be issued 26,000,000    
Number of common shares issued 98,585 4,335,580 12,798,447
Amount raised from shares issued $ 5.8 $ 208.3 $ 587.4
Number of common shares issued under the waiver approval process   4,239,477  
Amount raised from share issued under the waiver approval process   $ 203.7