Segment Information (Schedule Of Trade Sales and Tangible Long-Lived Assets, By Geographical Areas) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales	$ 1,332.9	$ 1,319.2	$ 1,269.6	$ 1,150.9	$ 1,182.0	$ 1,207.6	$ 845.1	$ 1,045.5	$ 5,072.6	$ 4,280.2	$ 4,752.5
Tangible long-lived assets	781.5				784.8				781.5	784.8	830.8
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									589.0	420.9	508.5
Tangible long-lived assets	150.1				155.0				150.1	155.0	160.2
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									559.0	441.7	449.9
Tangible long-lived assets	44.1				45.4				44.1	45.4	51.6
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									262.0	261.5	312.8
Tangible long-lived assets	26.9				30.2				26.9	30.2	36.4
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									276.0	215.4	256.0
Tangible long-lived assets	13.9				8.8				13.9	8.8	10.1
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									116.1	94.7	92.6
Tangible long-lived assets	9.8				11.1				9.8	11.1	14.7
Total foreign sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									1,802.1	1,434.2	1,619.8
Tangible long-lived assets	244.8				250.5				244.8	250.5	273.0
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									3,270.5	2,846.0	3,132.7
Tangible long-lived assets	$ 536.7				$ 534.3				$ 536.7	$ 534.3	$ 557.8