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Leases (Assets and Liabilities Balance Related to Finance and Operating Leases) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Leases [Abstract] |  |
Finance lease right-of-use assets | $ 1.4 | $ 1.5
Operating lease right-of-use assets | 18.6 | 18.9
Finance lease obligations, current portion | 0.4 | 0.4
Finance lease obligations, non-current portion | 1.0 | 1.1
Total finance lease obligations | 1.4 | 1.5
Operating lease obligations, current portion | 3.8 | 3.5
Operating lease obligations, non-current portion | 15.1 | 15.4
Total operating lease obligations | $ 18.9 | $ 18.9
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Property, plant and equipment, net of accumulated depreciation of $386.2 and $385.7 | Property, plant and equipment, net of accumulated depreciation of $386.2 and $385.7
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other accrued liabilities | Other accrued liabilities

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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 Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + 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, 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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