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Net Income Per Share of Class A and Class B Common Stock (Tables)
 12 Months Ended
Dec. 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):
Year Ended December 31,
 
2019
 
2018
 
2017
(in millions, except per share data)
 
Class A
 
Class B
 
Class A
 
Class B
 
Class A
 
Class B
Net income from continuing operations applicable to common stockholders
 
$
264.5

 
$
7.0

 
$
254.8

 
$
10.9

 
$
233.4

 
$
11.8

Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding
 
0.7

 
—

 
1.1

 
—

 
1.3

 
—

Conversion of Class B common shares into Class A common shares
 
6.3

 
—

 
9.8

 
—

 
10.5

 
—

Net income applicable to common stockholders - diluted
 
$
271.5

 
$
7.0

 
$
265.7

 
$
10.9

 
$
245.2

 
$
11.8

 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding – basic
 
22.6

 
0.6

 
23.4

 
1.0

 
23.9

 
1.2

Conversion of Class B common shares into Class A common shares
 
0.6

 
—

 
1.0

 
—

 
1.2

 
—

Effect of employee stock purchases and restricted stock units on weighted average common shares
 
0.2

 
—

 
0.1

 
—

 
—

 
—

Weighted average common shares outstanding – diluted
 
23.4

 
0.6

 
24.5

 
1.0

 
25.1

 
1.2

 
 
 
 
 
 
 
 
 
 
 
 
 
Net income per common share - basic
 
$
11.70

 
$
11.70

 
$
10.91

 
$
10.91

 
$
9.78

 
$
9.78

Net income per common share - diluted
 
$
11.60

 
$
11.60

 
$
10.86

 
$
10.86

 
$
9.75

 
$
9.75

 
 
 
 
 
 
 
 
 
 
 
 
 
Antidilutive Securities
 
 
 
 
 
 
 
 
 
 
 
 
Shares issuable pursuant to employee stock purchases not included since they were antidilutive
 
—

 
—

 
—

 
—

 
—

 
—