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Dividend Reinvestment and Stock Purchase Plan (Details) - USD ($)
$ in Millions
3 Months Ended 61 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Dividend Reinvestment and Stock Purchase Plan      
Authorized common shares to be issued 26,000,000    
Number of common shares issued 61,458 2,023,276 12,761,320
Amount raised from shares issued $ 3.5 $ 102.2 $ 585.1
Number of common shares issued under the waiver approval process   1,980,994  
Amount raised from share issued under the waiver approval process   $ 100.0