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Maturity of Operating Lease Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 1.9  
Lessee, Operating Lease, Liability, Payments, Due Year Two 1.1 $ 0.9
Lessee, Operating Lease, Liability, Payments, Due Year Three 1.2 0.9
Lessee, Operating Lease, Liability, Payments, Due Year Four 1.1 1.0
Lessee, Operating Lease, Liability, Payments, Due Year Five 1.1 1.0
Lessee, Operating Lease, Liability, Payments, Due after Year Five 3.8 3.8
Lessee, Operating Lease, Liability, Payments, Due 10.2 $ 8.5
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 3.4  
Operating Lease, Liability $ 6.8