Long-Lived Assets (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finite Lived Intangible Assets [Line Items]
Total amortization expense	$ 6.3	$ 5.8	$ 12.6	$ 11.4
Estimated total amortization expense 2020	24.5		24.5
Estimated total amortization expense 2021	16.9		16.9
Estimated total amortization expense 2022	13.1		13.1
Estimated total amortization expense 2023	9.6		9.6
Estimated total amortization expense 2024	6.7		6.7
Client contract costs
Finite Lived Intangible Assets [Line Items]
Total amortization expense	4.6	$ 6.4	$ 8.6	$ 12.4
Client contract costs | Cost of revenue
Finite Lived Intangible Assets [Line Items]
Impairment charge for write-off of capitalized client contract costs	$ 10.3