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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales	$ 1,144.9	$ 1,239.3	$ 1,213.2	$ 1,155.1	$ 1,046.7	$ 1,091.5	$ 1,102.5	$ 1,028.8	$ 4,752.5	$ 4,269.5	$ 3,943.8
Tangible long-lived assets	830.8				728.5				830.8	728.5	663.9	$ 723.4
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									508.5	525.6	475.3
Tangible long-lived assets	160.2				167.6				160.2	167.6	157.4
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									449.9	494.7	481.6
Tangible long-lived assets	51.6				55.5				51.6	55.5	54.7
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									312.8	286.8	265.1
Tangible long-lived assets	36.4				38.0				36.4	38.0	39.9
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									256.0	186.1	148.5
Tangible long-lived assets	10.1				10.1				10.1	10.1	6.5
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									92.6	94.8	85.5
Tangible long-lived assets	14.7				16.0				14.7	16.0	13.0
Total foreign sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									1,619.8	1,588.0	1,456.0
Tangible long-lived assets	273.0				287.2				273.0	287.2	271.5
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									3,132.7	2,681.5	2,487.8
Tangible long-lived assets	$ 557.8				$ 441.3				$ 557.8	$ 441.3	$ 392.4