Property and Equipment - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Loss on disposals of long-lived assets	$ 0.6	$ 0.9	$ 2.1
Depreciation expense	15.3	16.9	18.2
Amortization expense related to other assets	$ 0.3	$ 0.6	$ 0.6