CONDENSED CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 465.0	$ 421.0
Cost of sales	369.3	332.9
Gross margin	95.7	88.1
Selling, general and administrative expense	58.0	53.5
Other operating income (expense):
Currency transactions, net	(0.5)	12.2
Other operating expense, net	(3.2)	(3.3)
Income from operations	34.0	43.5
Other income (expense):
Interest and dividend income	0.1	1.2
Insurance settlement gain		1.5
Marketable equity securities	0.8	(1.5)
Other components of net periodic pension and OPEB cost	(4.3)	(4.7)
Interest expense	(5.0)	(4.6)
Income before income taxes	25.6	35.4
Income tax expense	6.0	8.4
Net income	$ 19.6	$ 27.0
Net income per basic and diluted share	$ 0.17	$ 0.23
Weighted average shares used in the calculation of net income per share	115.5	115.6