Operating Segments and Related Disclosures - Schedule of Selected Financial Information for Each Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net Sales:
Net sales	$ 511.1	$ 496.1
Reconciliation of segment performance to income before income taxes:
Segment performance	42.7	45.8
Interest expense	(3.9)	(5.1)
Stock-based compensation	0.9	(2.8)
Income before income taxes	38.3	23.7
Operating Segments
Net Sales:
Net sales	511.1	496.1
Reconciliation of segment performance to income before income taxes:
Segment performance	55.1	53.2
Operating Segments | Aerospace and Defense
Net Sales:
Net sales	510.5	495.5
Segment Performance:
Aerospace and Defense	62.7	52.4
Environmental remediation provision adjustments	(0.4)	(0.4)
Retirement benefits, net	9.2	3.2
Unusual items	(16.3)	(1.7)
Reconciliation of segment performance to income before income taxes:
Segment performance	55.2	53.5
Unusual items	(16.3)	(1.7)
Operating Segments | Real Estate
Net Sales:
Net sales	0.6	0.6
Reconciliation of segment performance to income before income taxes:
Segment performance	(0.1)	(0.3)
Segment Reconciling Items
Segment Performance:
Unusual items	(5.4)	(14.9)
Reconciliation of segment performance to income before income taxes:
Segment performance	55.1	53.2
Interest expense	(3.9)	(5.1)
Interest income and other	(0.2)	0.6
Stock-based compensation	0.9	(2.8)
Unusual items	(5.4)	(14.9)
Corporate, Non-Segment
Segment Performance:
Retirement benefits, net	0.0	(1.7)
Reconciliation of segment performance to income before income taxes:
Corporate and other	$ (8.2)	$ (5.6)