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Leases - Balance sheet by asset category (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Lessee, Lease, Description [Line Items] |  |  |
Operating lease ROU Asset | $ 52.6 | $ 39.1 |
Property, plant and equipment, gross | 608.6 | 557.9 |
Less: Accumulated depreciation | (396.3) | (357.9) |
Property, plant and equipment, net | 212.3 | 200.0 | $ 201.9
Finance Leased Asset |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Less: Accumulated depreciation | (10.8) | (8.5) |
Property, plant and equipment, net | 12.9 | 10.7 |
Finance Leased Real Estate |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property, plant and equipment, gross | 15.8 | 14.4 |
Finance Leased Automobile |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property, plant and equipment, gross | 0.1 |  |
Finance Leased Machinery and Equipment |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property, plant and equipment, gross | 7.8 | 4.8 |
Real Estate |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease ROU Asset | 48.1 | 33.1 |
Automobile |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease ROU Asset | 3.2 | 3.0 |
Machinery and equipment |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease ROU Asset | $ 1.3 | $ 3.0 |

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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