Operating Segments and Related Disclosures - Schedule of Selected Financial Information for Each Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net Sales:
Net sales	$ 549.8	$ 545.3	$ 1,589.4	$ 1,598.3
Reconciliation of segment performance to income before income taxes:
Segment performance	53.3	71.4	124.2	191.5
Interest expense	(5.1)	(4.9)	(13.3)	(15.1)
Stock-based compensation	(0.5)	(0.5)	(2.5)	(10.6)
Income before income taxes	27.4	57.3	89.4	142.0
Operating Segments
Net Sales:
Net sales	549.8	545.3	1,589.4	1,598.3
Reconciliation of segment performance to income before income taxes:
Segment performance	74.6	73.5	175.5	210.5
Operating Segments | Aerospace and Defense
Net Sales:
Net sales	549.2	544.7	1,587.6	1,596.2
Segment Performance:
Aerospace and Defense	69.5	76.0	169.7	213.3
Environmental remediation provision adjustments	(1.9)	(2.2)	(2.9)	(3.2)
Retirement benefits, net	6.9	2.7	25.2	8.6
Unusual items	0.4	(2.9)	(15.9)	(7.5)
Reconciliation of segment performance to income before income taxes:
Segment performance	74.9	73.6	176.1	211.2
Unusual items	0.4	(2.9)	(15.9)	(7.5)
Operating Segments | Real Estate
Net Sales:
Net sales	0.6	0.6	1.8	2.1
Reconciliation of segment performance to income before income taxes:
Segment performance	(0.3)	(0.1)	(0.6)	(0.7)
Segment Reconciling Items
Segment Performance:
Unusual items	(39.0)	(5.2)	(53.3)	(23.8)
Reconciliation of segment performance to income before income taxes:
Segment performance	74.6	73.5	175.5	210.5
Interest expense	(5.1)	(4.9)	(13.3)	(15.1)
Interest income and other	2.2	0.2	2.0	1.5
Stock-based compensation	(0.5)	(0.5)	(2.5)	(10.6)
Unusual items	(39.0)	(5.2)	(53.3)	(23.8)
Corporate, Non-Segment
Segment Performance:
Retirement benefits, net	0.1	(1.6)	0.2	(4.9)
Reconciliation of segment performance to income before income taxes:
Corporate and other	$ (4.9)	$ (4.2)	$ (19.2)	$ (15.6)