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Leases - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Jul. 01, 2007
USD ($)
Lessee, Lease, Description [Line Items]          
Operating lease right-of-use assets $ 27.6 $ 0.0   $ 27.1  
Operating lease liabilities 29.8     $ 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      
Lease period for sale-leaseback transactions   15 years      
Deferred gain $ 0.0 $ 1.9 $ 2.0    
Weighted-average remaining lease term – operating leases 3 years 9 months 18 days        
Weighted-average discount rate – operating leases 3.80%        
Joe Johnson Equipment          
Lessee, Lease, Description [Line Items]          
Operating lease liabilities $ 0.5        
Number of facility operating leases with affiliates 2        
Lease term 5 years        
Rent paid on operating leases $ 0.3 $ 0.3 $ 0.4    
MRL          
Lessee, Lease, Description [Line Items]          
Operating lease liabilities $ 4.2        
Number of facility operating leases with affiliates 5        
Rent paid on operating leases $ 0.5        
Minimum | MRL          
Lessee, Lease, Description [Line Items]          
Number of facility operating leases with affiliates 1        
Lease term 1 year        
Maximum | MRL          
Lessee, Lease, Description [Line Items]          
Lease term 5 years