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Leases Operating Lease Liabilities, Payments Due (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months   $ 0.9
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