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Leases - Balance sheet by asset category (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Apr. 01, 2018
--- | --- | --- | ---
Lessee, Lease, Description [Line Items] |  |  |
Operating lease ROU Asset | $ 31.2 |  |
Property, plant and equipment, gross | 539.2 | $ 537.4 |
Less: Accumulated depreciation | (339.6) | (335.5) |
Property, plant and equipment, net | 199.6 | $ 201.9 | $ 201.1
Finance Leased Asset |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Less: Accumulated depreciation | (8.1) |  |
Property, plant and equipment, net | 10.1 |  |
Finance Leased Real Estate |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property, plant and equipment, gross | 14.5 |  |
Finance Leased Machinery and Equipment |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property, plant and equipment, gross | 3.7 |  |
Real Estate |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease ROU Asset | 24.4 |  |
Automobile |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease ROU Asset | 3.3 |  |
Machinery and equipment |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease ROU Asset | $ 3.5 |  |

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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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- 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=77888419&loc=SL77918627-209977 + Details
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