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Leases Maturities of Lease Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Leases [Abstract]    
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 3.5  
Lessee, Operating Lease, Liability, Payments, Due Year Two 3.3  
Lessee, Operating Lease, Liability, Payments, Due Year Three 1.5  
Lessee, Operating Lease, Liability, Payments, Due Year Four 1.4  
Lessee, Operating Lease, Liability, Payments, Due Year Five 1.4  
Lessee, Operating Lease, Liability, Payments, Due after Year Five 7.2  
Lessee, Operating Lease, Liability, Payments, Due 18.3  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (4.6)  
Operating Lease, Liability $ 13.7 $ 14.5