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Leases | 12 Months Ended
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Sep. 30, 2019
Leases |
Leases | 11. Leases The Company and its subsidiaries are lessees in non-cancelable leasing agreements for office buildings and equipment. The related payments are expensed on a straight-line basis over the lease term, including, as applicable, any free-rent period during which the Company has the right to use the asset. For leases with renewal options where the renewal is reasonably assured, the lease term, including the renewal period is used to determine the appropriate lease classification and to compute periodic rental expense. The following table presents, in millions, amounts payable under non-cancelable operating lease commitments during the following fiscal years: ​
​ | ​ | ​ | ​
Year Ending September 30, |  | ​ | ​
2020 | ​ | $ | 236.2
2021 | ​ |  | 198.3
2022 | ​ |  | 166.0
2023 | ​ |  | 131.1
2024 | ​ |  | 105.0
Thereafter | ​ |  | 405.8
Total | ​ | $ | 1,242.4
​ Rent expense for leases for the years ended September 30, 2019, 2018 and 2017 was approximately $258.1 million, $268.5 million, and $265.9 million, respectively. When the Company is required to restore leased facilities to original condition, provisions are made over the period of the lease.

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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