Segment Information (Schedule Of Trade Sales and Tangible Long-Lived Assets, By Geographical Areas) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales	$ 4,725.3	$ 5,146.7	$ 5,072.6
Tangible long-lived assets	781.2	772.4	781.5
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales	715.2	624.5	589.0
Tangible long-lived assets	149.4	142.1	150.1
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales	464.7	501.5	559.0
Tangible long-lived assets	47.1	45.2	44.1
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales	296.6	279.4	262.0
Tangible long-lived assets	25.6	24.3	26.9
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales	232.6	262.8	276.0
Tangible long-lived assets	14.3	14.1	13.9
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales	139.2	129.2	116.1
Tangible long-lived assets	7.3	7.9	9.8
Total foreign sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales	1,848.3	1,797.4	1,802.1
Tangible long-lived assets	243.7	233.6	244.8
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales	2,877.0	3,349.3	3,270.5
Tangible long-lived assets	$ 537.5	$ 538.8	$ 536.7