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Long Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 6,845.1	$ 6,049.6
Current portion of long-term debt	1.2	1.1
Unamortized Debt Issuance Expense	55.9	42.0
Plus: Unamortized premium, net	23.6	32.5
Total long-term debt	6,811.6	6,039.0
Senior Notes | 2.50% convertible senior notes maturing in August 2027
Debt Instrument
Long-term Debt	575.0	575.0
Unamortized Debt Issuance Expense	$ 9.6	12.6
Debt Instrument, Interest Rate, Stated Percentage	2.50%
Senior Notes | 4.50% Senior Notes Maturing in September 2031
Debt Instrument
Long-term Debt	$ 980.6	1,049.7
Debt Instrument, Interest Rate, Stated Percentage	4.50%
Senior Notes | 4.625% Senior Notes Maturing in April 2030
Debt Instrument
Long-term Debt	$ 1,385.4	1,385.4
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Senior Notes | 5.50% Senior Notes Maturing in December 2029
Debt Instrument
Long-term Debt	$ 1,235.0	$ 1,235.0
Debt Instrument, Interest Rate, Stated Percentage	5.50%	5.50%
Senior Notes | 5.625% Senior Notes Maturing January 2028
Debt Instrument
Long-term Debt	$ 464.9	$ 939.9
Debt Instrument, Interest Rate, Stated Percentage	5.625%
Senior Notes | 5.75% Senior Notes Maturing March 2027
Debt Instrument
Long-term Debt	$ 0.0	459.3
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Senior Notes | 6.25% Senior Notes Maturing in February 2032
Debt Instrument
Long-term Debt	$ 1,000.0	0.0
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Senior Notes | 6.375% Senior Notes Maturing in March 2033
Debt Instrument
Long-term Debt	$ 1,200.0	0.0
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Term Loan
Debt Instrument
Long-term Debt	$ 0.0	400.0
Municipal Bonds
Debt Instrument
Long-term Debt	$ 4.2	$ 5.3

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