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Leases - Schedule of Additional Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows from operating leases | $ 172.6 | $ 184.9 | $ 188.3
Operating cash flows from finance leases | 3.7 | 3.0 | 2.5
Financing cash flows from finance leases | 32.4 | 28.9 | 23.7
Right-of-use assets obtained in exchange for new operating leases | 130.9 | 90.1 | 96.6
Right-of-use assets obtained in exchange for new finance leases | $ 47.2 | $ 26.6 | $ 37.5

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