Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Sales	$ 1,490.5	$ 1,493.6	$ 1,364.4
Gross profit	336.8	293.9	326.6
Selling, general and administrative expenses	173.2	163.6	167.4
Operating earnings	163.6	130.3	159.2
Other expense (income):
Interest expense	68.4	62.5	52.9
Net earnings in equity investee	(0.7)	(1.0)	(0.8)
Other, net	11.3	(8.8)	4.4
Earnings before income taxes	84.6	77.6	102.7
Income tax expense	22.1	8.8	60.0
Net earnings	$ 62.5	$ 68.8	$ 42.7
Basic net earnings per common share (in dollars per share)	$ 1.82	$ 2.02	$ 1.25
Diluted net earnings per common share (in dollars per share)	$ 1.81	$ 2.02	$ 1.25
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic (in shares)	33,882	33,848	33,819
Diluted (in shares)	33,882	33,848	33,820
Shipping and handling cost
Cost of goods and services	$ 312.5	$ 320.0	$ 267.5
Product cost
Cost of goods and services	$ 841.2	$ 879.7	$ 770.3