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Segment Information (Schedule Of Net Sales And Assets By Geographic Region) (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
Segment Reporting Information [Line Items]
Net sales	$ 837.5	$ 772.3	$ 841.6	$ 831.7	$ 839.6	$ 855.8	$ 851.0	$ 799.1	$ 3,283.1	$ 3,345.5	$ 2,786.0
Assets	4,423.7				4,042.7				4,423.7	4,042.7	3,593.5
Long-lived assets	2,446.2				2,157.7				2,446.2	2,157.7	2,109.8
United States
Segment Reporting Information [Line Items]
Net sales									2,111.3	2,107.2	1,767.3
Assets	2,139.7				1,866.5				2,139.7	1,866.5	1,645.3
Long-lived assets	635.9				442.3				635.9	442.3	645.8
Canada
Segment Reporting Information [Line Items]
Net sales									176.8	172.3	169.0
Assets	211.8				206.2				211.8	206.2	170.0
Long-lived assets	159.3				156.3				159.3	156.3	115.8
United Kingdom
Segment Reporting Information [Line Items]
Net sales									393.6	397.5	388.2
Continental Europe
Segment Reporting Information [Line Items]
Net sales									410.1	484.2	268.6
Assets	963.6				897.7				963.6	897.7	702.9
Long-lived assets	698.7				646.8				698.7	646.8	436.6
Other international
Segment Reporting Information [Line Items]
Net sales									191.3	184.3	192.9
Assets	787.6				808.2				787.6	808.2	432.9
Long-lived assets	631.3				648.2				631.3	648.2	269.2
Corporate Segment
Segment Reporting Information [Line Items]
Assets	321.0				264.1				321.0	264.1	642.4
Long-lived assets	$ 321.0				$ 264.1				$ 321.0	$ 264.1	$ 642.4