Operations by Industry Segment and Geographic Area - External Customers and Long-Lived Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segments, Geographical Areas [Abstract]
Revenues	$ 1,097.2	$ 1,024.4	$ 1,169.6
Long-lived assets by geographic region	171.7	172.8
United States
Segments, Geographical Areas [Abstract]
Revenues	842.1	817.0	908.5
Long-lived assets by geographic region	140.3	140.3
Canada
Segments, Geographical Areas [Abstract]
Revenues	69.8	57.9	66.8
Long-lived assets by geographic region	4.6	5.1
Australia and Oceania
Segments, Geographical Areas [Abstract]
Revenues	43.4	28.5	42.3
Africa
Segments, Geographical Areas [Abstract]
Revenues	33.9	22.4	44.7
Other European Countries
Segments, Geographical Areas [Abstract]
Revenues	32.7	23.2	32.2
Brazil
Segments, Geographical Areas [Abstract]
Revenues	21.5	20.4	11.6
Long-lived assets by geographic region	5.6	6.3
South America (excluding Brazil)
Segments, Geographical Areas [Abstract]
Revenues	15.2	21.9	17.9
MEXICO
Segments, Geographical Areas [Abstract]
Revenues	13.5	2.9	5.3
Other Asian Countries
Segments, Geographical Areas [Abstract]
Revenues	5.0	2.7	6.5
Central America (excluding Mexico)
Segments, Geographical Areas [Abstract]
Revenues	3.9	1.3	4.9
Post-Soviet States (excluding Russia)
Segments, Geographical Areas [Abstract]
Revenues	3.6	3.1	7.3
Middle East
Segments, Geographical Areas [Abstract]
Revenues	2.9	3.2	2.6
Japan and Korea
Segments, Geographical Areas [Abstract]
Revenues	2.7	8.1	3.6
India
Segments, Geographical Areas [Abstract]
Revenues	2.7	0.5	1.0
Russia
Segments, Geographical Areas [Abstract]
Revenues	2.6	4.0	5.1
West Indies
Segments, Geographical Areas [Abstract]
Revenues	1.3	6.1	6.4
China
Segments, Geographical Areas [Abstract]
Revenues	0.4	1.2	2.2
Other
Segments, Geographical Areas [Abstract]
Revenues	0.0	0.0	0.7
United Kingdom
Segments, Geographical Areas [Abstract]
Long-lived assets by geographic region	11.7	11.9
Canada
Segments, Geographical Areas [Abstract]
Long-lived assets by geographic region	5.3	4.8
SOUTH AFRICA
Segments, Geographical Areas [Abstract]
Long-lived assets by geographic region	3.9	4.0
Chile
Segments, Geographical Areas [Abstract]
Long-lived assets by geographic region	0.3	0.4
Total foreign
Segments, Geographical Areas [Abstract]
Revenues	255.1	207.4	$ 261.1
Long-lived assets by geographic region	$ 31.4	$ 32.5