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Short-Term Borrowings - Lines of Credit (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Lines of credit    
Amount drawn under lines of credit $ 0.0 $ 0.0
U.S. financial institutions line of credit    
Lines of credit    
Amount available 618.9 1,000.0
Federal Home Loan Bank line of credit    
Lines of credit    
Amount available 1,600.0 1,400.0
Federal Reserve Bank line of credit    
Lines of credit    
Amount available $ 687.8 $ 602.8