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Debt (Tables)
12 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Schedule of long-term debt outstanding
Long-term debt outstanding as of June 30, 2019 and 2018 consisted of the following: 
 
 
June 30,
($ in millions)
 
2019
 
2018
Senior unsecured notes, 5.20% due July 2021 (face value of $250.0 million at June 30, 2019 and 2018)
 
$
251.2

 
$
246.6

Senior unsecured notes, 4.45% due March 2023 (face value of $300.0 million at June 30, 2019 and 2018)
 
299.4

 
299.1

Total
 
550.6

 
545.7

Less: amounts due within one year
 

 

Long-term debt, net of current portion
 
$
550.6

 
$
545.7