Debt - Schedule of Long-Term Debt Outstanding (Details) - USD ($)	Sep. 30, 2023	Jun. 30, 2023
Debt Instrument [Line Items]
Long-term debt, net of current portion	$ 693,300,000	$ 693,000,000.0
Senior Notes
Debt Instrument [Line Items]
Total debt	693,300,000	693,000,000.0
Less: amounts due within one year	0	0
Long-term debt, net of current portion	$ 693,300,000	$ 693,000,000.0
Senior unsecured notes, 6.375% due July 2028 | Senior Notes
Debt Instrument [Line Items]
Interest rate	6.375%	6.375%
Face amount	$ 400,000,000	$ 400,000,000
Total debt	$ 396,700,000	$ 396,500,000
Senior unsecured notes, 7.625% due March 2030
Debt Instrument [Line Items]
Interest rate	7.625%	7.625%
Face amount	$ 300,000,000	$ 300,000,000
Total debt	$ 296,600,000	$ 296,500,000