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Debt (Tables)
12 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of long-term debt outstanding
Long-term debt outstanding as of June 30, 2018 and 2017 consisted of the following: 
 
 
June 30,
($ in millions)
 
2018
 
2017
Medium-term notes, Series B at 6.97% to 7.10% due from April 2018 to May 2018 (face value of $0.0 and $55.0 million at June 30, 2018 and 2017, respectively)
 
$

 
$
55.0

Senior unsecured notes, 5.20% due July 2021 (face value of $250.0 million at June 30, 2018 and 2017)
 
246.6

 
251.2

Senior unsecured notes, 4.45% due March 2023 (face value of $300.0 million at June 30, 2018 and 2017)
 
299.1

 
298.8

Total
 
545.7

 
605.0

Less: amounts due within one year
 

 
(55.0
)
Long-term debt, net of current portion
 
$
545.7

 
$
550.0