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Leases - Balance sheet by asset category (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Lessee, Lease, Description [Line Items] |  |  |
Operating lease ROU Asset | $ 46.9 | $ 52.6 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets, Noncurrent | Other Assets, Noncurrent |
Property, plant and equipment, gross | $ 608.8 | $ 608.6 |
Less: Accumulated depreciation | (408.1) | (396.3) |
Property, plant and equipment, net | 200.7 | 212.3 | $ 200.0
Finance Leased Asset |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Less: Accumulated depreciation | (4.2) | (10.8) |
Property, plant and equipment, net | 3.2 | 12.9 |
Finance Leased Real Estate |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property, plant and equipment, gross |  | 15.8 |
Finance Leased Automobile |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property, plant and equipment, gross | 0.1 | 0.1 |
Finance Leased Machinery and Equipment |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property, plant and equipment, gross | 7.3 | 7.8 |
Real Estate |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease ROU Asset | 43.4 | 48.1 |
Automobile |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease ROU Asset | 2.2 | 3.2 |
Machinery and equipment. |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease ROU Asset | $ 1.3 | $ 1.3 |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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=123391704&loc=SL77918627-209977 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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