Fair Value Measurements (Details Textual) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized cost of the investment in available-for-sale debt securities	$ 95.3	$ 90.0
Derivative, description of terms	We receive a cash settlement in the future if the prevailing interest rate is higher than the 1.68% strike price. The amount of future cash settlement is limited if the prevailing interest rate exceeds 2.78%. Alternatively, if interest rates were to decrease below the specified strike price, we would not receive a cash settlement.
Interest Rate Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Payments for purchase of swaption	$ 12.1
Derivative strike rate	1.68%
Derivative strike rate for limited settlement	2.78%
Available-for-sale Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face amount of investment in available-for-sale debt securities	$ 100.9
Expected remaining term of available for sale securities	9 months 18 days