Long-Lived Assets (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finite Lived Intangible Assets [Line Items]
Total amortization expense	$ 6.3	$ 5.9	$ 18.9	$ 17.3
Estimated total amortization expense 2020	25.3		25.3
Estimated total amortization expense 2021	18.4		18.4
Estimated total amortization expense 2022	13.9		13.9
Estimated total amortization expense 2023	10.0		10.0
Estimated total amortization expense 2024	6.7		6.7
Client contract costs
Finite Lived Intangible Assets [Line Items]
Total amortization expense	$ 4.2	$ 3.7	12.8	$ 16.1
Client contract costs | Cost of revenue
Finite Lived Intangible Assets [Line Items]
Impairment charge for write-off of capitalized client contract costs			$ 10.3