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Leases (Lease Liabilities Prior to ASC 842 Adoption) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Leases [Abstract]  
Future minimum lease payments, 2019 $ 2.7
Future minimum lease payments, 2020 2.7
Future minimum lease payments, 2021 2.8
Future minimum lease payments, 2022 2.9
Future minimum lease payments, 2023 3.0
Future minimum lease payments, thereafter $ 1.0