Segment Information (Schedule Of Net Sales And Assets By Geographic Region) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 2,936.9	$ 3,283.1	$ 3,345.5
Long-lived assets	704.7	728.9	599.1
United States
Segment Reporting Information [Line Items]
Net sales	1,862.7	2,111.3	2,107.2
Long-lived assets	339.2	364.2	304.6
Canada
Segment Reporting Information [Line Items]
Net sales	162.9	176.8	172.3
Long-lived assets	15.8	17.6	7.8
United Kingdom
Segment Reporting Information [Line Items]
Net sales	270.9	393.6	397.5
Continental Europe
Segment Reporting Information [Line Items]
Net sales	480.1	410.1	484.2
Long-lived assets	266.6	259.6	249.3
Other international
Segment Reporting Information [Line Items]
Net sales	160.3	191.3	184.3
Long-lived assets	60.7	61.7	32.5
Corporate Segment
Segment Reporting Information [Line Items]
Long-lived assets	$ 22.4	$ 25.8	$ 4.9