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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended 60 Months Ended
Feb. 15, 2019
Jan. 24, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Subsequent events                            
Dividends declared per common share (in dollars per share)     $ 0.23 $ 0.23 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.86 $ 0.80 $ 0.80  
DC Solar                            
Subsequent events                            
Potential disallowed tax credits                           $ 53.9
Subsequent Event                            
Subsequent events                            
Dividends declared per common share (in dollars per share)   $ 0.23                        
Dividends paid per common share (in dollars per share) $ 0.23