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Credit Agreements - Schedule of Debt Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Sep. 30, 2019 | Apr. 03, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal | $ 825.0 | $ 825.0 |
Debt Issuance Costs, Net | (7.6) | (6.0) |
Debt, Net | 817.4 | 819.0 |
Other short-term debt | 4.9 |  |
Senior Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 225.0 | 275.0 |
Debt Issuance Costs, Net | (0.4) | (0.6) |
Debt, Net | 224.6 | 274.4 | $ 325.0
4.600% Senior Notes Due May 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 300.0 | 300.0 |
Debt Issuance Costs, Net | (3.2) | (3.4) |
Debt, Net | 296.8 | 296.6 |
3.100% Senior Notes due March 2030 |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 300.0 |  |
Debt Issuance Costs, Net | (4.0) |  |
Debt, Net | $ 296.0 |  |
5.375% Senior Notes due March 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Principal |  | 250.0 |
Debt Issuance Costs, Net |  | (2.0) |
Debt, Net |  | $ 248.0 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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