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Credit Agreements - Schedule of Debt Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019 | Apr. 03, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal | $ 825.0 | $ 825.0 |
Debt Issuance Costs, Net | (7.1) | (6.0) |
Debt, Net | 817.9 | 819.0 |
Other short-term debt | 5.2 |  |
Senior Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 225.0 | 275.0 |
Debt Issuance Costs, Net | (0.3) | (0.6) |
Debt, Net | 224.7 | 274.4 | $ 325.0
4.600% Senior Notes Due May 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 300.0 | 300.0 |
Debt Issuance Costs, Net | (3.0) | (3.4) |
Debt, Net | 297.0 | 296.6 |
3.100% Senior Notes due March 2030 |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 300.0 |  |
Debt Issuance Costs, Net | (3.8) |  |
Debt, Net | $ 296.2 |  |
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=120520924&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=120400017&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=120391452&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=120398452&loc=d3e534808-122878 + Details
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