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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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Number of facility operating leases entered into with affiliates.

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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.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The amount of the gain recorded in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller to be recognized in future periods.

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