Quarterly Financial Information (Unaudited) (Schedule Of Quarterly Financial Information (Unaudited)) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information (Unaudited) [Abstract]
Net sales	$ 1,851.6	$ 1,877.9	$ 1,763.0	$ 1,773.2	$ 1,816.7	$ 1,981.4	$ 1,948.0	$ 1,777.8	$ 7,265.7	$ 7,523.9	$ 7,202.5
Gross margin	340.6	355.2	333.3	340.4	344.8	377.8	367.7	338.7	1,369.5	1,429.0	1,380.9
Net income (loss) attributable to the Company	$ 28.8	$ 34.5	$ 37.1	$ 21.4	$ 14.4	$ 48.8	$ 47.0	$ 34.3	$ 121.8	$ 144.5	$ 143.3
Net income (loss) attributable to the Company per share of common stock (usd per share)	$ 1.28	$ 1.52	$ 1.64	$ 0.94	$ 0.65	$ 2.17	$ 2.08	$ 1.51	$ 5.38	$ 6.41	$ 6.37
Common stock dividend declared, percent										5.00%	10.00%
Average common shares outstanding by quarter					21,390,053	21,449,751	21,513,493	21,616,141	22,642,057	22,555,240	22,507,701