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Debt (Tables)
12 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt Outstanding
Long-term debt outstanding at June 30, 2021 and 2020 consisted of the following: 
 June 30,
($ in millions)20212020
Senior unsecured notes, 5.20% due July 2021 (face value of $250.0 million at June 30, 2020)
$— $252.3 
Senior unsecured notes, 4.45% due March 2023 (face value of $300.0 million at June 30, 2021 and 2020)
299.5 299.5 
Senior unsecured notes, 6.375% due July 2028 (face value of $400.0 million at June 30, 2021)
395.0 — 
Total694.5 551.8 
Less: amounts due within one year— — 
Long-term debt, net of current portion$694.5 $551.8