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Leasing - Right of Use Assets and Lease Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Right of use assets and lease liabilities [Line Items] |  |
Finance Lease, Right-of-Use Asset | $ 24.9 | $ 7.3
Operating lease right-of-use assets | 116.6 | 118.5
Finance Lease, Liability | 21.6 | 7.3
Operating Lease, Liability | 117.0 | 118.5
Property, plant and equipment, net [Member] |  |
Right of use assets and lease liabilities [Line Items] |  |
Finance Lease, Right-of-Use Asset | 24.9 | 7.3
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 | 116.6 | 118.5
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 | 22.6 | 21.8
Accrued expenses and other [Member] |  |
Right of use assets and lease liabilities [Line Items] |  |
Finance Lease, Liability | 3.3 | 3.3
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 | 94.4 | 96.7
Postretirement benefits and other long-term liabilities [Member] |  |
Right of use assets and lease liabilities [Line Items] |  |
Finance Lease, Liability | 18.3 | 4.0
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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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