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Business Segment (Summary of Information by Business Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Total assets $ 3,980.6   $ 2,685.7
External Revenues 3,537.1 $ 3,184.8  
Income (Loss) 55.3 89.3  
Operating Segments | Marketing      
Segment Reporting Information [Line Items]      
Total assets 3,567.3    
External Revenues 3,537.1 3,184.7  
Income (Loss) 80.4 100.9  
Corporate and Other Assets      
Segment Reporting Information [Line Items]      
Total assets 413.3    
External Revenues 0.0 0.1  
Income (Loss) $ (25.1) $ (11.6)