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DEBT - Components of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Aug. 13, 2021 | Mar. 17, 2021 | Sep. 30, 2020 | Oct. 22, 2019 | Dec. 15, 2016
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Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 2,315.3 |  |  | $ 1,531.2 |  |
Finance lease obligations | 33.4 |  |  | 36.1 |  |
Less current portions | 57.8 |  |  | 66.4 |  |
Long-term debt | 2,236.7 |  |  | 1,455.1 |  |
Credit Facilities | Revolving loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | 0.0 |  |  | 64.0 |  |
Credit Facilities | Term loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | 670.0 |  |  | 710.0 |  |
Senior Notes | Senior Notes – 4.000% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 500.0 |  |  | $ 0.0 |  |
Interest rate (percent) | 4.00% |  | 4.00% | 4.00% |  |
Senior Notes | Senior Notes – 4.375% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 400.0 |  |  | $ 0.0 |  |
Interest rate (percent) | 4.375% | 4.375% |  | 4.375% |  |
Senior Notes | Senior Notes - 4.500% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 450.0 |  |  | $ 450.0 |  |
Interest rate (percent) | 4.50% |  |  | 4.50% | 4.50% |
Senior Notes | Senior Notes – 5.250% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 250.0 |  |  | $ 250.0 |  |
Interest rate (percent) | 5.25% |  |  | 5.25% |  | 5.25%
Receivables facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 0.0 |  |  | $ 20.0 |  |
Other |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | 11.9 |  |  | 1.1 |  |
Long-term Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Less unamortized debt issuance costs | $ 20.8 |  |  | $ 9.7 |  |

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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=123466204&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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