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Property and Equipment Leases, Supplement Balance Sheet Information (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Operating lease right-of-use assets $ 14.9 $ 15.9
Operating lease liability 16.8 17.8
Property and equipment, gross 71.4 69.9
Accumulated depreciation, depletion and amortization, property and equipment (49.8) (48.0)
Property and equipment, net 21.6 21.9
Other liabilities 61.9 52.1
Finance leases [Member]    
Lessee, Lease, Description [Line Items]    
Property and equipment, gross 1.1 1.1
Accumulated depreciation, depletion and amortization, property and equipment (0.6) (0.5)
Property and equipment, net 0.5 0.6
Other liabilities $ 0.6 $ 0.6