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Long Term Debt (Tables)
12 Months Ended
Sep. 30, 2024
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
September 30,
20242023
2.50% convertible senior notes maturing August 2027$575.0 $575.0 
4.50% senior notes maturing September 2031980.6 1,049.7 
4.625% senior notes maturing April 20301,385.4 1,385.4 
5.50% senior notes maturing December 20291,235.0 1,235.0 
5.625% senior notes maturing January 2028464.9 939.9 
5.75% senior notes maturing March 2027— 459.3 
6.25% senior secured notes maturing February 2032
1,000.0 — 
6.375% senior notes maturing March 2033
1,200.0 — 
Fourth Incremental Term Loan
— 400.0 
Municipal bond4.2 5.3 
$6,845.1 $6,049.6 
Less: Current portion of long-term debt1.2 1.1 
Debt issuance costs, net55.9 42.0 
Plus: Unamortized premium, net23.6 32.5 
Total long-term debt$6,811.6 $6,039.0 
Repayments of Long-Term Debt
The following table presents the Company’s (i) principal repayments of debt, which, net of discounts, were included in the Consolidated Statements of Cash Flows, (ii) principal amounts of debt exchanged (refer to “Joinder Agreements” above), which were not included in the Consolidated Statements of Cash Flows and (iii) the associated loss (gain) related to such repayments and exchanges included in “Loss (gain) on extinguishment of debt, net” in the Consolidated Statements of Operations.
Loss (Gain) on Extinguishment of Debt, net
Debt InstrumentPrincipal Amount RepaidPrincipal Amount ExchangedDebt Discounts (Received) / Premiums PaidWrite-off of Debt Issuance Costs /
 Tender Fees
Write-off of Unamortized Premiums
Year Ended September 30, 2024
4.50% senior notes$69.1 $— $(7.9)$0.5 $— 
5.625% senior notes475.0 — 4.2 2.5 — 
5.75% senior notes459.3 — 4.4 1.6 (4.6)
Fourth Incremental Term Loan400.0 — — 1.4 — 
Municipal bond1.1 — — — — 
Revolving Credit Facility645.0 — — — — 
Total$2,049.5 $— $0.7 $6.0 $(4.6)
Year Ended September 30, 2023
4.50% senior notes$220.8 $— $(31.5)$1.7 $— 
4.625% senior notes96.8 — (11.4)0.5 (0.9)
5.625% senior notes
1.0 — — — — 
Third Incremental Term Loan
30.1 99.9 — 1.1 — 
Municipal bond1.1 — — — — 
Total$349.8 $99.9 $(42.9)$3.3 $(0.9)
Year Ended September 30, 2022
4.50% senior notes
$529.5 $— $(74.7)$6.0 $— 
4.625% senior notes
167.8 — (21.9)1.1 (1.8)
5.50% senior notes
15.0 — (1.2)0.1 (0.2)
5.75% senior notes
840.0 — 24.1 5.0 (13.3)
First Incremental Term Loan
— 840.0 — 3.5 — 
Second Incremental Term Loan
107.7 342.3 — 0.7 — 
Municipal bond1.1 — — — — 
Total$1,661.1 $1,182.3 $(73.7)$16.4 $(15.3)
Schedule of Maturities of Long-term Debt
As of September 30, 2024, expected principal payments on the Company’s debt for the next five fiscal years based on the debt maturity dates were:
Fiscal 2025$1.2 
Fiscal 20261.2 
Fiscal 2027 (a)
576.3 
Fiscal 2028465.4 
Fiscal 2029— 
(a)Includes principal payment of $575.0 related to the Company’s 2.50% convertible senior notes.