Operations by Industry Segment and Geographic Area - External Customers and Long-Lived Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segments, Geographical Areas [Abstract]
Revenues	$ 1,274.5	$ 1,095.5	$ 1,024.4
Long-lived assets by geographic region	173.6	171.7
United States
Segments, Geographical Areas [Abstract]
Revenues	1,014.3	842.1	817.0
Long-lived assets by geographic region	142.4	140.3
Canada
Segments, Geographical Areas [Abstract]
Revenues	63.0	68.1	57.9
Long-lived assets by geographic region	4.4	4.6
Australia and Oceania
Segments, Geographical Areas [Abstract]
Revenues	46.7	43.4	28.5
Africa
Segments, Geographical Areas [Abstract]
Revenues	36.1	33.9	22.4
Other European Countries
Segments, Geographical Areas [Abstract]
Revenues	28.0	32.7	23.2
Brazil
Segments, Geographical Areas [Abstract]
Revenues	24.8	21.5	20.4
Long-lived assets by geographic region	6.9	5.6
South America (excluding Brazil)
Segments, Geographical Areas [Abstract]
Revenues	20.0	15.2	21.9
Mexico
Segments, Geographical Areas [Abstract]
Revenues	10.7	13.5	2.9
Central America (excluding Mexico)
Segments, Geographical Areas [Abstract]
Revenues	10.7	3.9	1.3
Other Asian Countries
Segments, Geographical Areas [Abstract]
Revenues	10.2	5.0	2.7
Middle East
Segments, Geographical Areas [Abstract]
Revenues	3.1	2.9	3.2
India
Segments, Geographical Areas [Abstract]
Revenues	2.9	2.7	0.5
Post-Soviet States (excluding Russia)
Segments, Geographical Areas [Abstract]
Revenues	2.7	3.6	3.1
Japan and Korea
Segments, Geographical Areas [Abstract]
Revenues	0.4	2.7	8.1
West Indies
Segments, Geographical Areas [Abstract]
Revenues	0.4	1.3	6.1
Russia
Segments, Geographical Areas [Abstract]
Revenues	0.3	2.6	4.0
China
Segments, Geographical Areas [Abstract]
Revenues	0.1	0.4	1.2
Other
Segments, Geographical Areas [Abstract]
Revenues	0.1	0.0	0.0
Long-lived assets by geographic region	0.1	0.0
United Kingdom
Segments, Geographical Areas [Abstract]
Long-lived assets by geographic region	10.3	11.7
Canada
Segments, Geographical Areas [Abstract]
Long-lived assets by geographic region	5.2	5.3
South Africa
Segments, Geographical Areas [Abstract]
Long-lived assets by geographic region	4.1	3.9
Chile
Segments, Geographical Areas [Abstract]
Long-lived assets by geographic region	0.2	0.3
Total foreign
Segments, Geographical Areas [Abstract]
Revenues	260.2	253.4	$ 207.4
Long-lived assets by geographic region	$ 31.2	$ 31.4