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Net Income Per Share of Class A and Class B Common Stock (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Following is a reconciliation of net income and weighted average shares used for our basic earnings per share (“EPS”) and diluted EPS (in millions, except per share amounts):
Three Months Ended March 31,
 
2019
 
2018
(in millions, except per share data)
 
Class A
 
Class B
 
Class A
 
Class B
Net income applicable to common stockholders - basic
 
$
54.4

 
$
2.0

 
$
50.0

 
$
2.1

Reallocation of net income due to conversion of Class B to Class A common shares outstanding
 
0.3

 
—

 
0.3

 
—

Conversion of Class B common shares into Class A common shares
 
1.7

 
—

 
1.8

 
—

Net income applicable to common stockholders - diluted
 
$
56.4

 
$
2.0

 
$
52.1

 
$
2.1

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding – basic
 
22.3

 
0.8

 
24.1

 
1.0

Conversion of Class B common shares into Class A common shares
 
0.8

 
—

 
1.0

 
—

Effect of dilutive stock options on weighted average common shares
 
0.1

 
—

 
0.1

 
—

Weighted average common shares outstanding – diluted
 
23.2

 
0.8

 
25.2

 
1.0

 
 
 
 
 
 
 
 
 
Net income per common share - basic
 
$
2.43

 
$
2.43

 
$
2.08

 
$
2.08

Net income per common share - diluted
 
$
2.42

 
$
2.42

 
$
2.07

 
$
2.07


The effect of antidilutive securities on Class A and Class B stock was evaluated for the three month periods ended March 31, 2019 and 2018 and was determined to be immaterial.