Segment Information (Schedule Of Revenue From External Sales And Long-Lived Assets, By Geographical Areas) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales	$ 1,046.7	$ 1,091.5	$ 1,102.5	$ 1,028.8	$ 984.5	$ 1,009.7	$ 989.3	$ 960.3	$ 4,269.5	$ 3,943.8	$ 3,749.9
Tangible long-lived assets	728.5				663.9				728.5	663.9	565.5	$ 663.9
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									525.6	475.3	445.2
Tangible long-lived assets	167.6				157.4				167.6	157.4	128.6
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									494.7	481.6	420.0
Tangible long-lived assets	55.5				54.7				55.5	54.7	45.5
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									286.8	265.1	215.1
Tangible long-lived assets	38.0				39.9				38.0	39.9	29.6
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									186.1	148.5	132.8
Tangible long-lived assets	10.1				6.5				10.1	6.5	6.3
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									94.8	85.5	69.4
Tangible long-lived assets	16.0				13.0				16.0	13.0	12.7
Total foreign sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									1,588.0	1,456.0	1,282.5
Tangible long-lived assets	287.2				271.5				287.2	271.5	222.7
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Trade sales									2,681.5	2,487.8	2,467.4
Tangible long-lived assets	$ 441.3				$ 392.4				$ 441.3	$ 392.4	$ 342.8