Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Income tax benefit related to goodwill impairment charges	$ 12.4
Impairment charge to intangible assets	15.7
Services
Segment Reporting Information [Line Items]
Intangible asset amortization expense	2.2	$ 2.5
G E S U S
Segment Reporting Information [Line Items]
Goodwill impairment	41.9
GES EMEA
Segment Reporting Information [Line Items]
Goodwill impairment	29.0
Pursuit Glacier Park Collection
Segment Reporting Information [Line Items]
Goodwill impairment	$ 1.8