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Common Stock (Tables)
 12 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of Stock Repurchases
Repurchases of the Company’s common and class B stock are as follows:

Years ended June 30,
2019

 
2018

 
2017

(In millions)
 
 
 
 
 
Number of shares
0.2

 
0.5


0.9

Cost at market value
$
10.0

 
$
31.1

 
$
53.3