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Debt (Tables)
3 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Schedule of long-term debt outstanding
Long-term debt outstanding as of September 30, 2021 and June 30, 2021 consisted of the following:
 
($ in millions)September 30,
2021
June 30,
2021
Senior unsecured notes, 4.45% due March 2023 (face value of $300.0 million at September 30, 2021 and June 30, 2021)
$299.6 $299.5 
Senior unsecured notes, 6.375% due July 2028 (face value of $400.0 million at September 30, 2021 and June 30, 2021)
395.2 395.0 
Total694.8 694.5 
Less: amounts due within one year— — 
Long-term debt, net of current portion$694.8 $694.5