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Business Segments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting [Abstract]      
Number of Operating Segments | segment 2    
Allocated Interest and Other Expenses | $ $ 52.9 $ 43.4 $ 42.1