Earnings per Share (Tables)
 3 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table summarizes the components of basic and diluted earnings per share.
 
Three Months Ended
 
September 30,

2016

2015
Net earnings attributable to CDK
$
76.9

 
$
59.0







Weighted-average shares outstanding:





Basic
150.2


159.2

Effect of employee stock options
0.8


0.7

Effect of employee restricted stock
0.7


0.8

Diluted
151.7


160.7







Basic earnings attributable to CDK per share
$
0.51


$
0.37

Diluted earnings attributable to CDK per share
$
0.51


$
0.37
Schedule of Antidilutive Securities Excluded from Computation of Diluted Earnings Per Share
The weighted-average number of shares outstanding used in the calculation of diluted earnings per share does not include the effect of the following anti-dilutive securities.
 
Three Months Ended
 
September 30,
 
2016
 
2015
Stock-based awards
0.3

 
0.1