Condensed Consolidated Statement of Shareholders' Equity Deficit (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Other Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance (in shares) at Nov. 30, 2015		62.9
Beginning balance at Nov. 30, 2015	$ (146.4)	$ 6.5	$ 340.1	$ (64.5)	$ (86.8)	$ (341.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	7.0				7.0
Actuarial losses, net of income taxes	(8.6)					(8.6)
Amortization of actuarial losses and prior service credits, net of income taxes	3.3					3.3
Reclassification from redeemable common stock	(0.7)		(0.7)
Tax benefit from shares issued under equity plans	2.4		2.4
Repurchase of shares to satisfy tax withholding obligations	(0.2)		(0.2)
Stock-based compensation and other, net	1.0		1.0
Ending balance, (in shares) at Dec. 31, 2015		62.9
Ending balance at Dec. 31, 2015	(142.2)	$ 6.5	342.6	(64.5)	(79.8)	(347.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	5.1				5.1
Actuarial losses, net of income taxes	0.0
Amortization of actuarial losses and prior service credits, net of income taxes	9.1					9.1
Reclassification from redeemable common stock (in shares)		0.0
Reclassification from redeemable common stock	0.3		0.3
Repurchase of shares to satisfy tax withholding obligations (in shares)		(0.1)
Repurchase of shares to satisfy tax withholding obligations	(0.7)		(0.7)
Stock-based compensation and other, net	3.1		3.1
Stock-based compensation and other, net (in shares)		0.3
Ending balance, (in shares) at Mar. 31, 2016		63.1
Ending balance at Mar. 31, 2016	$ (125.3)	$ 6.5	$ 345.3	$ (64.5)	$ (74.7)	$ (337.9)