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FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring Basis
The following table summarizes the fair value of the Company’s assets and liabilities for which disclosure of fair value is required:
20242023
Fair Value Hierarchy LevelCarrying AmountEstimated Fair ValueCarrying AmountEstimated Fair Value
Assets
Cash equivalents
Level 1
$51.2 $51.2 $1.2 $1.2 
Other
Investment securities in non-qualified retirement plan assets
Level 1
32.4 32.4 36.3 36.3 
Convertible debt investmentsLevel 345.8 45.8 85.8 85.8 
Liabilities
Debt instruments
Credit facilities – revolving loans
Level 2
— — 88.3 88.3 
Credit facilities – term loans
Level 2
625.0 625.0 925.0 925.0 
Senior Notes due 2031 – 4.000%
Level 2
500.0 456.3 500.0 380.0 
Senior Notes due 2032 – 4.375%
Level 2
400.0 370.0 400.0 304.0 
Senior Notes due 2029 – 4.500%
Level 2
450.0 432.0 450.0 366.8 
Senior Notes due 2026 – 5.250%
Level 2
250.0 248.8 250.0 233.1 
Other debt
Level 2
— — 0.4 0.4 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Changes in the balance of Level 3 convertible debt investments carried at fair value are presented below. There were no transfers into or out of Level 3.
 Year Ended September 30,
 20242023
Fair value at beginning of year$85.8 $117.0 
Total realized / unrealized gains (losses) included in net earnings(64.2)(97.6)
Total realized / unrealized gains / losses included in / reclassified from OCI24.2 66.4 
Fair value at end of year$45.8 $85.8 
Debt Securities, Available-for-Sale, Allowance for Credit Loss A progression of the allowance for expected credit losses on convertible debt investments is shown below:
 Year Ended September 30,
 20242023
Balance at beginning of year$101.3 $— 
Provision for expected credit losses on securities with no previous allowance— 101.3 
Reductions for securities intended to be sold / exchanged(99.4)— 
Balance at end of year$1.9 $101.3