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Business Segments - Segment Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting [Abstract]      
Primary $ 1,332.0 $ 1,433.7 $ 1,480.7
Corporate, unallocated 67.6 66.0 56.8
TOTAL $ 1,399.6 $ 1,499.7 $ 1,537.5