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Income Per Share of Common Stock (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Summary of Reconciliation of Numerator and Denominator Used to Calculate Basic and Diluted Income (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,
 
2018
 
2017
 
2018
 
2017
 
(In millions, except per share amounts)
Numerator:
 
 
 
 
 
 
 
Net income
$
34.8

 
$
24.3

 
$
48.8

 
$
30.2

Income allocated to participating securities
(0.8
)
 
(0.5
)
 
(1.0
)
 
(0.7
)
Net income for basic EPS
34.0

 
23.8

 
47.8

 
29.5

Interest on 4 1/16% Convertible Subordinated Debentures (“4 1/16% Debentures”)
—

 
—

 
—

 
0.1

Net income for diluted EPS
$
34.0

 
$
23.8

 
$
47.8

 
$
29.6

Denominator:
 
 
 
 
 
 
 
Basic weighted average shares
73.9

 
73.2

 
73.8

 
72.6

Effect of:
 
 
 
 
 
 
 
4 1/16% Debentures
—

 
—

 
—

 
0.1

2.25% Convertible Senior Notes (“2 1/4% Notes”) (1)
1.1

 
—

 
1.1

 
—

Employee stock options and stock purchase plan (2)
0.1

 
—

 
0.1

 
—

Diluted weighted average shares
75.1

 
73.2

 
75.0

 
72.7

Basic
 
 
 
 
 
 
 
Basic EPS
$
0.46

 
$
0.32

 
$
0.65

 
$
0.41

Diluted
 
 
 
 
 
 
 
Diluted EPS
$
0.45

 
$
0.32

 
$
0.64

 
$
0.41


_______
(1) The Company's 2 1/4% Notes were not included in the computation of diluted EPS for the three and six months ended June 30, 2017, because the average market price of the common stock did not exceed the conversion price and the Company only expects the conversion premium for the 2 1/4% Notes to be settled in common shares.
(2) There was less than 0.1 million of common share dilution impact from employee stock options and the stock purchase plan for the three and six months ended June 30, 2017.