Debt - Schedule of long-term debt outstanding (Details) - USD ($)	Sep. 30, 2022	Jun. 30, 2022	Mar. 16, 2022
Debt Instrument [Line Items]
Total debt	$ 692,100,000	$ 691,800,000
Less: amounts due within one year	0	0
Long-term debt, net of current portion	$ 692,100,000	$ 691,800,000
Senior unsecured notes, 6.375% due July 2028
Debt Instrument [Line Items]
Interest rate	6.375%	6.375%
Face amount	$ 400,000,000	$ 400,000,000
Total debt	$ 396,000,000.0	$ 395,900,000
Senior unsecured notes, 7.625% due March 2030
Debt Instrument [Line Items]
Interest rate	7.625%	7.625%	7.625%
Face amount	$ 300,000,000	$ 300,000,000	$ 300,000,000
Total debt	$ 296,100,000	$ 295,900,000