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Taxes on Income - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Deferred Tax Assets [Abstract]    
Capitalized mixed service costs $ 127.5 $ 162.6
Net operating loss and state credit carry-forwards 328.3 325.8
Deferred compensation and benefits 209.3 210.5
Foreign tax credit carry-forwards 70.4 81.6
Debt premium 43.7 48.6
Other 118.9 116.1
Total deferred tax assets 1,097.2 1,131.6
Valuation allowance (297.1) (290.5)
Deferred tax assets, net of valuation allowance 800.1 841.1
Deferred Tax Liabilities [Abstract]    
Goodwill and other purchased intangibles 697.7 800.8
Deferred Tax Liabilities, Right-of-Use Asset 151.0 160.3
Other 129.7 88.8
Total deferred tax liabilities 978.4 1,049.9
Net Deferred Tax Liability 178.3 208.8
Deferred Tax Assets, Lease Liability $ 199.1 $ 186.4