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Leasing - Right of Use Assets and Lease Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Right of use assets and lease liabilities [Line Items] |  |
Finance Lease, Right-of-Use Asset | $ 102.4 | $ 106.2
Operating lease right-of-use assets | 115.6 | 107.2
Finance Lease, Liability | 98.5 | 105.4
Operating Lease, Liability | 117.4 | 108.3
Property, plant and equipment, net [Member] |  |
Right of use assets and lease liabilities [Line Items] |  |
Finance Lease, Right-of-Use Asset | 102.4 | 106.2
Operating lease right-of-use assets | 0.0 | 0.0
Operating lease right-of-use assets [Member] |  |
Right of use assets and lease liabilities [Line Items] |  |
Finance Lease, Right-of-Use Asset | 0.0 | 0.0
Operating lease right-of-use assets | 115.6 | 107.2
Current portion of operating lease liabilities |  |
Right of use assets and lease liabilities [Line Items] |  |
Finance Lease, Liability | 0.0 | 0.0
Operating Lease, Liability | 21.9 | 21.1
Accrued expenses and other [Member] |  |
Right of use assets and lease liabilities [Line Items] |  |
Finance Lease, Liability | 11.2 | 13.0
Operating Lease, Liability | 0.0 | 0.0
Long-term portion of operating lease liabilities |  |
Right of use assets and lease liabilities [Line Items] |  |
Finance Lease, Liability | 0.0 | 0.0
Operating Lease, Liability | 95.5 | 87.2
Postretirement benefits and other long-term liabilities [Member] |  |
Right of use assets and lease liabilities [Line Items] |  |
Finance Lease, Liability | 87.3 | 92.4
Operating Lease, Liability | $ 0.0 | $ 0.0

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- Definition [Line Items] for Right of use assets and lease liabilities [Table] + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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