Long-Lived Assets (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finite Lived Intangible Assets [Line Items]
Total amortization expense	$ 6.3	$ 5.6
Estimated total amortization expense 2020	23.2
Estimated total amortization expense 2021	16.0
Estimated total amortization expense 2022	13.2
Estimated total amortization expense 2023	9.6
Estimated total amortization expense 2024	6.7
Client contract costs
Finite Lived Intangible Assets [Line Items]
Total amortization expense	$ 4.0	$ 6.0