Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Goodwill impairment	$ 3.5	$ 1.7
Franchise value, impairment	$ 4.4	$ 0.4

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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