CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Sales	$ 232.7	$ 240.5	$ 809.4	$ 849.1
Shipping and handling cost	53.2	57.5	195.9	233.0
Product cost	111.5	33.2	381.7	336.5
Gross profit	68.0	149.8	231.8	279.6
Selling, general and administrative expenses	27.2	26.8	82.3	76.2
Operating earnings	40.8	123.0	149.5	203.4
Other (income) expense:
Interest expense	5.4	5.5	16.1	14.4
Other, net	(4.3)	(3.1)	(9.0)	0.9
Earnings before income taxes	39.7	120.6	142.4	188.1
Income tax expense	12.7	32.7	41.6	50.7
Net earnings	$ 27.0	$ 87.9	$ 100.8	$ 137.4
Basic net earnings per common share (in dollars per share)	$ 0.80	$ 2.60	$ 2.98	$ 4.07
Diluted net earnings per common share (in dollars per share)	$ 0.80	$ 2.60	$ 2.97	$ 4.07
Weighted-average common shares outstanding (in thousands):
Basic (in shares)	33,696	33,575	33,668	33,542
Diluted (in shares)	33,708	33,601	33,687	33,566
Cash dividends per share (in dollars per share)	$ 0.66	$ 0.60	$ 1.98	$ 1.8