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Business Segments (Schedule of Information by Business Segment) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 4,305.3						$ 4,305.3		$ 4,123.2
External Revenues	5,797.9			$ 6,194.7			16,460.5	$ 18,079.8
Income (Loss)	167.7	$ 132.8	$ 106.3	219.5	$ 183.3	$ 152.4	406.8	555.2
Corporate and other assets
Segment Reporting Information [Line Items]
Total assets	263.3						263.3
External Revenues	0.1			0.3			0.2	0.4
Income (Loss)	(19.5)			(17.3)			(58.0)	(49.8)
Marketing | Marketing
Segment Reporting Information [Line Items]
Total assets	4,042.0						4,042.0
External Revenues	5,797.8			6,194.4			16,460.3	18,079.4
Income (Loss)	$ 187.2			$ 236.8			$ 464.8	$ 605.0

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