Segment Information (Schedule Of Net Sales And Assets By Geographic Region) (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016		Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 714.2	$ 695.9	$ 702.5	$ 673.4	$ 681.6		$ 694.2	$ 712.2	$ 660.0	$ 2,786.0	$ 2,748.0		$ 2,740.5
Assets	3,593.5				3,428.0					3,593.5	3,428.0		3,336.9
Long-Lived Assets	2,109.8				1,993.6					2,109.8	1,993.6		1,856.6
U.S. [Member]
Segment Reporting Information [Line Items]
Net sales										1,767.3	1,769.7	[1]	1,698.6	[1]
Assets	1,645.3				1,609.4	[1]				1,645.3	1,609.4	[1]	1,648.3	[1]
Long-Lived Assets	645.8				621.3	[1]				645.8	621.3	[1]	642.0	[1]
Canada [Member]
Segment Reporting Information [Line Items]
Net sales										169.0	163.2	[1]	212.7	[1]
Assets	170.0				159.8	[1]				170.0	159.8	[1]	160.8	[1]
Long-Lived Assets	115.8				109.0	[1]				115.8	109.0	[1]	111.5	[1]
United Kingdom [Member]
Segment Reporting Information [Line Items]
Net sales										388.2	357.6	[1]	350.9	[1]
Europe [Member]
Segment Reporting Information [Line Items]
Net sales										268.6	279.6	[1]	282.2	[1]
Assets	702.9				588.0	[1]				702.9	588.0	[1]	599.2	[1]
Long-Lived Assets	436.6				357.9	[1]				436.6	357.9	[1]	335.7	[1]
Other International [Member]
Segment Reporting Information [Line Items]
Net sales										192.9	177.9	[1]	196.1	[1]
Assets	432.9				457.8	[1]				432.9	457.8	[1]	444.7	[1]
Long-Lived Assets	269.2				292.4	[1]				269.2	292.4	[1]	278.8	[1]
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Assets	642.4				613.0	[1]				642.4	613.0	[1]	483.9	[1]
Long-Lived Assets	$ 642.4				$ 613.0	[1]				$ 642.4	$ 613.0	[1]	$ 488.6	[1]

[1] Net sales and assets by geographic region are based on the location of the business unit.