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Earnings Per Share ("EPS") of Common Stock (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Summary of Reconciliation of Numerator and Denominator Used to Calculate Basic and Diluted Income (Loss) Per Share of Common Stock
The following table reconciles the numerator and denominator used to calculate basic and diluted EPS of common stock:
 
Three months ended June 30,
 
Six months ended June 30,
 
2020
 
2019
 
2020
 
2019
 
(In millions, except per share amounts)
Numerator:
 
 
 
 
 
 
 
Net income
$
39.2

 
$
44.1

 
$
70.6

 
$
82.8

Income allocated to participating securities
(0.5
)
 
(0.9
)
 
(1.0
)
 
(1.6
)
Net income for basic and diluted EPS
$
38.7

 
$
43.2

 
$
69.6

 
$
81.2

Denominator:
 
 
 
 
 
 
 
Basic weighted average shares
77.6

 
77.1

 
77.5

 
77.1

Effect of:
 
 
 
 
 
 
 
2.25% Convertible Senior Notes ("21/4% Notes")
4.3

 
3.5

 
4.9

 
3.4

Awards issued under equity plans
0.2

 
0.1

 
0.2

 
0.1

Diluted weighted average shares
82.1

 
80.7

 
82.6

 
80.6

Basic
 
 
 
 
 
 
 
Basic EPS
$
0.50

 
$
0.56

 
$
0.90

 
$
1.05

Diluted
 
 
 
 
 
 
 
Diluted EPS
$
0.47

 
$
0.54

 
$
0.84

 
$
1.01