Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)	Sep. 30, 2021	Jun. 30, 2021
Principal Balance
Principal Balance	$ 2,790,300,000	$ 2,791,300,000
Current portion of long-term debt	(4,100,000)	(4,100,000)
Long-term debt	2,786,200,000	2,787,200,000
Unamortized Discount and Debt Issuance Costs
Unamortized Discount and Debt Issuance Costs	(42,700,000)	(45,300,000)
Current portion of long-term debt	0	0
Long-term debt	(42,700,000)	(45,300,000)
Carrying Value
Long-term debt, including current maturities	2,747,600,000	2,746,000,000
Current portion of long-term debt	(4,100,000)	(4,100,000)
Long-term debt, carrying value	$ 2,743,500,000	$ 2,741,900,000
Senior Notes | 6.875% senior notes, due February 1, 2026
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.875%	6.875%
Principal Balance
Principal Balance	$ 1,022,900,000	$ 1,022,900,000
Unamortized Discount and Debt Issuance Costs
Unamortized Discount and Debt Issuance Costs	(12,100,000)	(12,700,000)
Carrying Value
Long-term debt, including current maturities	$ 1,010,800,000	$ 1,010,200,000
Senior Secured Notes | 6.500% senior secured notes, due July 1, 2025
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.50%	6.50%
Principal Balance
Principal Balance	$ 300,000,000.0	$ 300,000,000.0
Unamortized Discount and Debt Issuance Costs
Unamortized Discount and Debt Issuance Costs	(3,900,000)	(4,000,000.0)
Carrying Value
Long-term debt, including current maturities	296,100,000	296,000,000.0
Variable-rate credit facility | Variable-rate credit facility | Senior credit facility term loan, due January 31, 2025
Principal Balance
Principal Balance	1,062,500,000	1,062,500,000
Unamortized Discount and Debt Issuance Costs
Unamortized Discount and Debt Issuance Costs	(9,700,000)	(10,400,000)
Carrying Value
Long-term debt, including current maturities	1,052,800,000	1,052,100,000
Variable-rate credit facility | Variable-rate credit facility | Senior credit facility incremental term loan, due January 31, 2025
Principal Balance
Principal Balance	404,900,000	405,900,000
Unamortized Discount and Debt Issuance Costs
Unamortized Discount and Debt Issuance Costs	(17,000,000.0)	(18,200,000)
Carrying Value
Long-term debt, including current maturities	387,900,000	387,700,000
Variable-rate credit facility | Variable-rate credit facility | Revolving credit facility of $350 million, due January 31, 2023
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	350,000,000	350,000,000
Principal Balance
Principal Balance	0	0
Unamortized Discount and Debt Issuance Costs
Unamortized Discount and Debt Issuance Costs	0	0
Carrying Value
Long-term debt, including current maturities	$ 0	$ 0