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, 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
Quarterly Financial Information (Unaudited) [Abstract]
Net sales	$ 1,816.7	$ 1,981.4	$ 1,948.0	$ 1,777.8	$ 1,862.2	$ 1,870.3	$ 1,832.3	$ 1,637.7	$ 7,523.9		$ 7,202.5		$ 6,631.2
Gross margin	344.8	377.8	367.7	338.7	364.9	353.4	351.2	311.4	1,429.0		1,380.9		1,261.3
Net income (loss) attributable to the Company	$ 14.4	$ 48.8	$ 47.0	$ 34.3	$ 24.1	$ 53.6	$ 44.5	$ 21.1	$ 144.5		$ 143.3		$ 71.6
Net income (loss) attributable to the Company per share of common stock (usd per share)	$ 0.65	$ 2.17	$ 2.08	$ 1.51	$ 1.08	$ 2.38	$ 1.98	$ 0.93	$ 6.41	[1]	$ 6.37	[1]	$ 3.20	[1]
Common stock dividend declared, percent									5.00%		10.00%		10.00%
Average common shares outstanding by quarter	21,390,053	21,449,751	21,513,493	21,616,141	19,454,943	19,465,072	19,500,916	19,544,758	22,555,240		22,507,701		22,368,941

[1] Adjusted for the declaration of a 5% stock dividend in December 2019, shares related to which were issued in February 2020. Prior to the adjustment, the average common shares outstanding were 21.4 million shares and 21.3 million shares for the years ended December 31, 2018 and 2017, respectively.