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Leases - Additional Information (Details) $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2019 USD ($) | Jul. 01, 2007 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease right-of-use assets | $ 24.9 |  | $ 0.0 | $ 27.1 |
Operating lease liabilities | $ 27.2 |  |  | $ 29.5 |
Deferred gain on sale-leaseback transactions |  |  | 8.7 |  | $ 29.0
Deferred tax impact of remaining deferred gain associated with the sale-leaseback transactions |  |  | 2.2 |  |
Sale-leaseback transaction lease period | 15 years |  |  |  |
Deferred gain | $ 0.0 | $ 0.9 | $ 1.9 |  |
Number of principal manufacturing plants leased | 8 |  |  |  |
Number of principal manufacturing plants | 14 |  |  |  |
Weighted-average remaining lease term – operating leases | 4 years |  |  |  |
Weighted-average discount rate – operating leases | 4.00% |  |  |  |
Joe Johnson Equipment |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease liabilities | $ 0.6 |  |  |  |
Number of facility operating leases with affiliates | 2 |  |  |  |
Initial lease term for two facilities owned by affiliates of the sellers of JJE | 5 years |  |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from a gain reported for tax purposes on sale and leaseback transactions in accordance with enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28680-109314 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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