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Fair Value Measurements (Tables)
6 Months Ended
Mar. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value on a recurring basis
The assets and liabilities measured at fair value on a recurring basis were as follows: 
(in millions)Level 1Level 2Level 3NAV as a
Practical
Expedient
Total
as of March 31, 2025
Assets
Investments, at fair value
Sponsored funds and separate accounts$54.7 $178.0 $9.0 $36.3 $278.0 
Investments related to long-term incentive plans226.2 2.8 — 29.2 258.2 
Other equity and debt investments13.2 11.5 1.6 34.2 60.5 
Total Assets Measured at Fair Value$294.1 $192.3 $10.6 $99.7 $596.7 
Liabilities
Securities sold short$116.6 $— $— $— $116.6 
Contingent consideration liabilities— — 27.5 — 27.5 
Total Liabilities Measured at Fair Value$116.6 $ $27.5 $ $144.1 
As of March 31, 2025, there were $39.7 million of other investments which were adjusted to fair value on a nonrecurring basis and excluded from the table above.
(in millions)Level 1Level 2Level 3NAV as a
Practical
Expedient
Total
as of September 30, 2024
Assets
Investments, at fair value
Sponsored funds and separate accounts$306.3 $157.4 $5.2 $40.2 $509.1 
Investments related to long-term incentive plans242.5 — — 29.1 271.6 
Other equity and debt investments4.1 11.1 2.6 39.5 57.3 
Total Assets Measured at Fair Value$552.9 $168.5 $7.8 $108.8 $838.0 
Liabilities
Securities sold short$178.1 $— $— $— $178.1 
Contingent consideration liabilities— — 28.2 — 28.2 
Total Liabilities Measured at Fair Value$178.1 $ $28.2 $ $206.3 
Schedule of investments measured at NAV
Investments for which fair value was estimated using reported NAV as a practical expedient primarily consist of nonredeemable private equity, debt and infrastructure funds, and redeemable alternative credit, global equity, private real estate funds and alternatives. These investments were as follows:
(in millions)March 31,
2025
September 30,
2024
Nonredeemable investments1
Investments with known liquidation periods$25.8 $32.4 
Investments with unknown liquidation periods15.4 16.1 
Redeemable investments2
58.5 60.3 
Unfunded commitments11.0 14.0 
Schedule of financial instruments not measured at fair value
Financial instruments that were not measured at fair value were as follows:
(in millions)Fair Value
Level
March 31, 2025September 30, 2024
Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair Value
Financial Assets
Cash and cash equivalents1$2,754.0 $2,754.0 $3,309.5 $3,309.5 
Other investments
Time deposits212.8 12.8 9.8 9.8 
Equity securities3401.5 401.5 270.9 270.9 
Financial Liability
Debt2$2,671.3 $2,234.4 $2,780.3 $2,387.0