Income Per Share of Common Stock (Tables)

6 Months Ended

Jun. 30, 2017

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 per share of common stock ("EPS") is presented in the following table:

	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
	(In millions, except per share amounts)
Numerator:
Net income	$	24.3		$	5.9		$	30.2		$	11.0
Income allocated to participating securities	(0.5		)	(0.1		)	(0.7		)	(0.2		)
Net income for basic earnings per share	23.8			5.8			29.5			10.8
Interest on 4 1/16% Convertible Subordinated Debentures (“4 1/16% Debentures”)	—			—			0.1			—
Net income for diluted earnings per share	$	23.8		$	5.8		$	29.6		$	10.8
Denominator:
Basic weighted average shares	73.2			63.1			72.6			63.1
Effect of:
4 1/16% Debentures	—			—			0.1			—
Employee stock options and stock purchase plan (1)	—			0.1			—			0.1
Diluted weighted average shares	73.2			63.2			72.7			63.2
Basic and Diluted
Net income per share	$	0.32		$	0.09		$	0.41		$	0.17

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(1) Less than 0.1 million of common share dilution impact from employee stock options and stock purchase plan for the second quarter and first half of fiscal 2017.

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

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

	Three months ended June 30,		Six months ended June 30,
	2017	2016	2017	2016
	(In millions)
4 1/16% Debentures	—	9.4	—	9.4
Total potentially dilutive securities	—	9.4	—	9.4