Income (Loss) Per Share of Common Stock (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Summary of Reconciliation of Numerator and Denominator Used to Calculate Basic and Diluted Loss Per Share of Common Stock

A reconciliation of the numerator and denominator used to calculate basic and diluted income (loss) per share of common stock ("EPS"):

	Year Ended									One month ended
	December 31,			November 30,			November 30,			December 31,
	2016			2015			2014			2015
	(In millions, except per share amounts)
Numerator:
Income (loss) from continuing operations	$	18.1		$	(17.1	)	$	(49.3	)	$	7.0
(Loss) income from discontinued operations, net of income taxes	(0.1		)	0.9			(0.7		)	—
Net income (loss)	18.0			(16.2		)	(50.0		)	7.0
Income allocated to participating securities	(0.4		)	—			—			(0.2		)
Net income (loss) for basic earnings per share	17.6			(16.2		)	(50.0		)	6.8
Interest on 4 1/16%Debentures	—			—			—			0.3
Net income (loss) for diluted earnings per share	$	17.6		$	(16.2	)	$	(50.0	)	$	7.1
Denominator:
Basic weighted average shares	65.6			61.1			57.9			62.9
Effect of:
4 1/16%Debentures	—			—			—			9.4
Employee stock options and stock purchase plan	0.1			—			—			0.2
Diluted weighted average shares	65.7			61.1			57.9			72.5
Basic:
Income (loss) from continuing operations	$	0.27		$	(0.28	)	$	(0.85	)	$	0.11
(Loss) income from discontinued operations, net of income taxes	—			0.01			(0.01		)	—
Net income (loss) per share	$	0.27		$	(0.27	)	$	(0.86	)	$	0.11
Diluted:
Income (loss) from continuing operations	$	0.27		$	(0.28	)	$	(0.85	)	$	0.10
(Loss) income from discontinued operations, net of income taxes	—			0.01			(0.01		)	—
Net income (loss) per share	$	0.27		$	(0.27	)	$	(0.86	)	$	0.10

Schedule of Potentially Dilutive Securities Excluded from Computation

The following table sets forth the potentially dilutive securities excluded from the computation because their effect would have been anti-dilutive:

	Year Ended			One month ended
	December 31,	November 30,	November 30,	December 31,
	2016	2015	2014	2015
	(In millions)
4 1/16%Debentures	7.1	11.0	17.9	—
Employee stock options and stock purchase plan	—	0.2	0.2	—
Unvested restricted shares	—	1.6	1.7	—
Total potentially dilutive securities	7.1	12.8	19.8	—