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Leases - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 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 | $ 28.5 | $ 28.5 |  | $ 0.0 | $ 27.1 |
Operating lease liabilities | $ 30.7 | $ 30.7 |  |  | $ 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 | $ 1.4 | $ 1.9 |  |
Weighted-average remaining lease term – operating leases | 4 years | 4 years |  |  |  |
Weighted-average discount rate – operating leases | 3.80% | 3.80% |  |  |  |
Joe Johnson Equipment |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease liabilities | $ 0.5 | $ 0.5 |  |  |  |
Number of facility operating leases with affiliates | 2 | 2 |  |  |  |
Lease term | 5 years | 5 years |  |  |  |
MRL |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease liabilities | $ 4.4 | $ 4.4 |  |  |  |
Number of facility operating leases with affiliates | 5 | 5 |  |  |  |
Payments for rent | $ 0.3 |  |  |  |  |
Minimum | MRL |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of facility operating leases with affiliates | 1 | 1 |  |  |  |
Lease term | 1 year | 1 year |  |  |  |
Maximum | MRL |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lease term | 5 years | 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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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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