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Short-Term Borrowings - Lines of Credit (Details)
$ in Millions
Sep. 30, 2016
USD ($)
Lines of credit  
Amount drawn under lines of credit $ 0.0
U.S. financial institutions line of credit  
Lines of credit  
Amount available 618.9
Federal Home Loan Bank line of credit  
Lines of credit  
Amount available 1,600.0
Federal Reserve Bank line of credit  
Lines of credit  
Amount available $ 687.8