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Debt - Long-term (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Debt issuance cost | $ (19.4) | $ (20.2) |
Total long-term debt | 3,595.7 | 3,113.9 |
Less: debt maturing within one year | 63.9 | 82.8 |
Total long-term debt, less current portion | 3,531.8 | 3,031.1 |
Pollution Control and Industrial Revenue Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 51.7 | 51.6 |
Unamortized discount | $ 0.1 |  | $ 0.2
Pollution Control and Industrial Revenue Bonds [Member] | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate Percentage | 4.00% |  |
Pollution Control and Industrial Revenue Bonds [Member] | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate Percentage | 6.50% |  |
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | $ 2,198.8 | 2,198.7 |
Unamortized discount | $ 1.2 |  | $ 1.3
Senior Notes [Member] | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate Percentage | 3.20% |  |
Senior Notes [Member] | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate Percentage | 4.50% |  |
2017 Term Loan Facility |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate Percentage | 2.20% |  |
Long-term debt, gross | $ 800.0 | 800.0 |
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate Percentage | 1.90% |  |
Long-term debt, gross | $ 500.0 | 0.0 |
Letters of credit outstanding amount | 215.1 |  |
Credit agreement, available funds | 784.9 |  |
Foreign debt |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | $ 64.6 | $ 83.8 |
Foreign debt | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate Percentage | 0.00% |  |
Foreign debt | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate Percentage | 7.20% |  |

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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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