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Business Segment (Summary of Information by Business Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total Assets	$ 2,325.6		$ 2,325.6		$ 2,331.0
Total revenues	3,788.0	$ 3,236.3	10,861.2	$ 9,447.0
Income (Loss)	45.0	67.9	136.1	120.4
Operating Segments | Marketing
Segment Reporting Information [Line Items]
Total Assets	2,090.0		2,090.0
Total revenues	3,788.0	3,236.3	10,860.7	9,446.8
Income (Loss)	54.6	75.9	126.1	140.1
Corporate and other assets
Segment Reporting Information [Line Items]
Total Assets	235.6		235.6
Total revenues	0.0	0.0	0.5	0.2
Income (Loss)	$ (9.6)	$ (8.0)	$ 10.0	$ (19.7)

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