Operating Segments and Related Disclosures, (As Restated for fiscal 2014 and 2013) - Selected Financial Information for Each Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Nov. 30, 2015	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	May. 31, 2015	May. 31, 2014	Aug. 31, 2015	Aug. 31, 2014	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2013
Net Sales:
Net sales	$ 486.5	$ 441.0	$ 457.8	$ 323.0	$ 443.6	$ 420.4	$ 406.6	$ 331.6	$ 780.8	$ 738.2	$ 1,221.8	$ 1,158.6	$ 1,708.3	$ 1,602.2	$ 1,378.1
Reconciliation of segment performance to loss from continuing operations before income taxes:
Interest expense		(11.9)	(13.2)	(13.4)	(13.7)	(14.0)	(12.6)	(12.4)	(26.6)	(25.0)	(38.5)	(39.0)	(50.4)	(52.7)	(48.7)
Interest income		0.1	0.0	0.1	0.1	0.0	0.0	0.0	0.1	0.0	0.2	0.0	0.3	0.1	0.2
Stock-based compensation expense				(5.3)				(1.4)	(8.3)	(3.0)	(10.4)	(4.5)	(8.6)	(5.7)	(14.1)
Loss from continuing operations before income taxes													(16.8)	(33.0)	(35.7)
Capital Expenditures													36.8	43.4	63.2
Depreciation and amortization		$ 16.1	$ 16.1	$ 16.3	$ 17.3	$ 15.7	$ 15.8	$ 14.9	$ 32.4	$ 30.7	$ 48.5	$ 46.4	65.1	63.7	43.5
Operating Segments [Member]
Net Sales:
Net sales													1,708.3	1,602.2	1,378.1
Segment Performance:
Segment performance													83.3	117.9	91.5
Reconciliation of segment performance to loss from continuing operations before income taxes:
Segment performance													83.3	117.9	91.5
Segment Reconciling Items [Member]
Segment Performance:
Unusual items													(1.9)	(60.8)	(22.9)
Reconciliation of segment performance to loss from continuing operations before income taxes:
Interest expense													(50.4)	(52.7)	(48.7)
Interest income													0.3	0.1	0.2
Stock-based compensation expense													(8.6)	(5.7)	(14.1)
Unusual items													(1.9)	(60.8)	(22.9)
Corporate, Non-Segment [Member]
Segment Performance:
Retirement benefit plan expense													(17.4)	(11.3)	(20.8)
Reconciliation of segment performance to loss from continuing operations before income taxes:
Corporate retirement benefit plan expense													(17.4)	(11.3)	(20.8)
Corporate and other													(22.1)	(20.5)	(20.9)
Aerospace and Defense [Member]
Reconciliation of segment performance to loss from continuing operations before income taxes:
Capital Expenditures													36.8	43.1	63.2
Depreciation and amortization													64.4	63.0	42.8
Aerospace and Defense [Member] | Operating Segments [Member]
Net Sales:
Net sales													1,660.0	1,596.0	1,372.4
Segment Performance:
Aerospace and Defense													165.7	148.6	138.1
Environmental remediation provision adjustments													(16.6)	(8.8)	(4.6)
Retirement benefit plan expense													(50.2)	(25.2)	(44.2)
Unusual items													(50.0)	(0.9)	(1.6)
Segment performance													48.9	113.7	87.7
Reconciliation of segment performance to loss from continuing operations before income taxes:
Segment performance													48.9	113.7	87.7
Corporate retirement benefit plan expense													(50.2)	(25.2)	(44.2)
Unusual items													(50.0)	(0.9)	(1.6)
Real Estate [Member]
Reconciliation of segment performance to loss from continuing operations before income taxes:
Capital Expenditures													0.0	0.0	0.0
Depreciation and amortization													0.7	0.7	0.7
Real Estate [Member] | Operating Segments [Member]
Net Sales:
Net sales													48.3	6.2	5.7
Segment Performance:
Segment performance													34.4	4.2	3.8
Reconciliation of segment performance to loss from continuing operations before income taxes:
Segment performance													34.4	4.2	3.8
Corporate Segment [Member]
Reconciliation of segment performance to loss from continuing operations before income taxes:
Capital Expenditures													0.0	0.3	0.0
Depreciation and amortization													$ 0.0	$ 0.0	$ 0.0