Debt - Schedule of long-term debt outstanding (Details) - USD ($)	Mar. 31, 2022	Mar. 16, 2022	Jun. 30, 2021	Mar. 26, 2021	Jul. 10, 2020
Debt Instrument [Line Items]
Total debt	$ 990,900,000		$ 694,500,000
Less: amounts due within one year	300,000,000.0		0
Long-term debt, net of current portion	$ 690,900,000		$ 694,500,000
Senior unsecured notes, 4.45% due March 2023
Debt Instrument [Line Items]
Interest rate	4.45%		4.45%	4.45%
Face amount	$ 300,000,000		$ 300,000,000
Total debt	$ 299,700,000		$ 299,500,000	$ 300,000,000
Senior unsecured notes, 6.375% due July 2028
Debt Instrument [Line Items]
Interest rate	6.375%		6.375%		6.375%
Face amount	$ 400,000,000		$ 400,000,000		$ 400,000,000
Total debt	$ 395,600,000		$ 395,000,000.0
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	$ 295,600,000		$ 0