Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Revenues	$ 736.9	$ 664.7	$ 1,368.9	$ 1,263.3
Cost of revenues	570.8	526.7	1,077.4	1,013.7
Gross Profit	166.1	138.0	291.5	249.6
Operating costs:
Selling, general, and administrative expenses	73.0	79.5	146.7	148.6
Gain on disposition of property, plant, equipment, and other assets	(4.5)	(2.0)	(8.3)	(5.9)
(Gain) loss on sale of businesses	2.8	(12.5)	2.5	(19.5)
Impairment charge	0.0	5.8	0.0	5.8
Operating profit	94.8	67.2	150.6	120.6
Interest expense	28.5	11.4	56.8	19.7
Interest Income	(1.3)	(0.7)	(3.1)	(2.4)
Other (income) expense	(2.2)	3.3	(2.1)	2.8
Income before income taxes	69.8	53.2	99.0	100.5
Provision for income taxes	10.1	7.6	15.7	15.7
Net income	$ 59.7	$ 45.6	$ 83.3	$ 84.8
Net income per common share:
Basic (in dollars per share)	$ 1.22	$ 0.93	$ 1.70	$ 1.74
Diluted (in dollars per share)	$ 1.22	$ 0.93	$ 1.70	$ 1.74
Weighted average number of shares outstanding:
Basic (in shares)	48.9	48.6	48.8	48.5
Diluted (in shares)	49.0	48.7	48.9	48.7
Dividends declared per common share	$ 0.05	$ 0.05	$ 0.10	$ 0.10