Operating Segments and Related Disclosures - Schedule of Selected Financial Information for Each Reportable Segment (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2015	Mar. 31, 2016	Feb. 28, 2015
Net Sales:
Net sales	$ 96.3	$ 356.9	$ 323.0
Segment Performance:
Unusual items	(0.4)	(0.2)	0.5
Reconciliation of segment performance to income (loss) from continuing operations before income taxes:
Interest expense	(3.8)	(11.1)	(13.4)
Interest income	0.0	0.2	0.1
Stock-based compensation (expense) benefit	0.4	(2.3)	(5.3)
Unusual items	(0.4)	(0.2)	0.5
Income (loss) from continuing operations before income taxes	9.0	8.7	(9.3)
Operating Segments [Member]
Net Sales:
Net sales	96.3	356.9	323.0
Segment Performance:
Total Segment Performance	15.4	30.7	19.6
Reconciliation of segment performance to income (loss) from continuing operations before income taxes:
Segment performance	15.4	30.7	19.6
Operating Segments [Member] | Aerospace and Defense [Member]
Net Sales:
Net sales	95.8	355.3	321.4
Segment Performance:
Aerospace and Defense	19.6	42.9	31.9
Environmental remediation provision adjustments	0.1	(0.6)	(1.4)
Retirement benefit plan expense	(4.1)	(12.5)	(12.5)
Unusual items	(0.4)	0.1	0.7
Total Segment Performance	15.2	29.9	18.7
Reconciliation of segment performance to income (loss) from continuing operations before income taxes:
Segment performance	15.2	29.9	18.7
Corporate retirement benefit plan expense	(4.1)	(12.5)	(12.5)
Unusual items	(0.4)	0.1	0.7
Operating Segments [Member] | Real Estate [Member]
Net Sales:
Net sales	0.5	1.6	1.6
Segment Performance:
Total Segment Performance	0.2	0.8	0.9
Reconciliation of segment performance to income (loss) from continuing operations before income taxes:
Segment performance	0.2	0.8	0.9
Segment Reconciling Items [Member]
Segment Performance:
Unusual items	0.0	(0.3)	(0.2)
Reconciliation of segment performance to income (loss) from continuing operations before income taxes:
Interest expense	(3.8)	(11.1)	(13.4)
Interest income	0.0	0.2	0.1
Stock-based compensation (expense) benefit	0.4	(2.3)	(5.3)
Unusual items	0.0	(0.3)	(0.2)
Corporate, Non-Segment [Member]
Segment Performance:
Retirement benefit plan expense	(1.5)	(4.7)	(4.3)
Reconciliation of segment performance to income (loss) from continuing operations before income taxes:
Corporate retirement benefit plan expense	(1.5)	(4.7)	(4.3)
Corporate and other expense, net	$ (1.5)	$ (3.8)	$ (5.8)