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Debt (Tables)
6 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of long-term debt outstanding
Long-term debt outstanding as of December 31, 2020 and June 30, 2020 consisted of the following:
 
($ in millions)December 31,
2020
June 30,
2020
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 December 31, 2020 and June 30, 2020)
299.3 299.5 
Senior unsecured notes, 6.375% due July 2028 (face value of $400.0 million at December 31, 2020)
394.7 — 
Total694.0 551.8 
Less: amounts due within one year— — 
Long-term debt, net of current portion$694.0 $551.8