Investments in Joint Ventures - Schedule of results of operations of the joint ventures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Revenue and Expenses
Revenues	$ 269.2	$ 251.7
Expenses	167.3	143.0
Excess of revenues over expenses	$ 101.9	$ 108.7