Consolidated and Combined Statements of Operating Income (unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenues		$ 434.1	$ 353.0	$ 845.0	$ 707.4
Operating costs:
Cost of revenues		345.7	283.0	678.5	568.6
Selling, engineering, and administrative expenses		46.1	39.4	86.9	77.0
Total operating costs		391.8	322.4	765.4	645.6
Total operating profit		42.3	30.6	79.6	61.8
Interest expense		1.6	0.0	3.5	0.0
Other, net (income) expense		(0.1)	1.2	(0.3)	2.2
Income before income taxes		40.8	29.4	76.4	59.6
Provision for income taxes		9.0	6.8	16.9	14.8
Net income		$ 31.8	$ 22.6	$ 59.5	$ 44.8
Net income per common share:
Basic (in dollars per share)		$ 0.66	$ 0.46	$ 1.23	$ 0.92
Diluted (in dollars per share)		$ 0.65	$ 0.46	$ 1.21	$ 0.92
Weighted average number of shares outstanding
Basic (in shares)	[1]	47.8	48.8	47.9	48.8
Diluted (in shares)	[1]	48.3	48.8	48.4	48.8
Dividends declared per common share		$ 0.05	$ 0	$ 0.1	$ 0

[1] For periods prior to the Separation, the denominator for basic and diluted net income per common share was calculated using the 48.8 million shares of common stock outstanding immediately following the Separation.