Long-Lived Assets (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Acquired client contracts
Finite Lived Intangible Assets [Line Items]
Weighted-average remaining amortization period		109 months
Estimated total amortization expense 2020	$ 9.5
Estimated total amortization expense 2021	6.8
Estimated total amortization expense 2022	6.5
Estimated total amortization expense 2023	5.5
Estimated total amortization expense 2023	$ 5.3
Software
Finite Lived Intangible Assets [Line Items]
Weighted-average remaining amortization period	43 months
Estimated total amortization expense 2020	$ 12.0
Estimated total amortization expense 2021	8.4
Estimated total amortization expense 2022	6.1
Estimated total amortization expense 2023	3.8
Estimated total amortization expense 2023	$ 0.9