v3.24.1.u1
Fair Value Measurements (Tables)
 6 Months Ended
Mar. 31, 2024
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, 2024
Assets
Investments, at fair value
Sponsored funds and separate accounts$318.3 $211.6 $16.4 $42.3 $588.6 
Investments related to long-term incentive plans232.8 — — 25.7 258.5 
Other equity and debt investments3.6 9.0 1.0 39.0 52.6 
Total Assets Measured at Fair Value$554.7 $220.6 $17.4 $107.0 $899.7 
Liabilities
Securities sold short$199.3 $— $— $— $199.3 
Contingent consideration liabilities— — 51.4 — 51.4 
Total Liabilities Measured at Fair Value$199.3 $— $51.4 $— $250.7 
(in millions)Level 1Level 2Level 3NAV as a
Practical
Expedient		Total
as of September 30, 2023
Assets
Investments, at fair value
Sponsored funds and separate accounts$356.5 $211.9 $18.5 $43.6 $630.5 
Investments related to long-term incentive plans168.2 — — 23.4 191.6 
Other equity and debt investments3.4 11.3 3.3 32.7 50.7 
Total Assets Measured at Fair Value$528.1 $223.2 $21.8 $99.7 $872.8 
Liabilities
Securities sold short$158.3 $— $— $— $158.3 
Contingent consideration liabilities— — 55.0 — 55.0 
Total Liabilities Measured at Fair Value$158.3 $— $55.0 $— $213.3 
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 and private real estate funds. These investments were as follows:
(in millions)March 31,
2024		September 30,
2023
Nonredeemable investments1
Investments with known liquidation periods$36.7 $32.1 
Investments with unknown liquidation periods16.4 17.4 
Redeemable investments2
53.9 50.2 
Unfunded commitments43.1 43.1 
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, 2024September 30, 2023
Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair Value
Financial Assets
Cash and cash equivalents1$3,300.2 $3,300.2 $3,686.4 $3,686.4 
Other investments
Time deposits210.1 10.1 9.9 9.9 
Equity securities3251.2 251.2 250.1 250.1 
Financial Liability
Debt2$3,041.0 $2,552.1 $3,052.8 $2,419.4