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Investments in Qualified Affordable Housing Projects (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Investment In Qualified Affordable Housing Projects.    
Tax Credits and Benefits $ 3.3 $ 2.4
Amortization 3.0 1.5
Carrying value 36.6 26.8
Original Investment Value 46.9  
Funding obligation $ 18.5 $ 14.7