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Business Segments - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting [Abstract]      
Number of operating segments | segment 3    
Allocated corporate expenses | $ $ 103.9 $ 68.0 $ 50.8