Investments in Affiliates - Summary of Financial Information for Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement
Revenues	$ 73.9	$ 109.1	$ 154.7	$ 238.5
Operating costs and expenses	69.7	103.9	140.8	220.1
Income (Loss) from Continuing Operations	(4.1)	(1.3)	1.7	7.1
Net Income (Loss)	(4.7)	(0.8)	1.5	8.2
Equity Method Investments
Income Statement
Revenues	38.3	57.6	90.3	98.4
Operating costs and expenses	34.1	54.7	74.0	92.0
Gross Profit (Loss)	4.2	2.9	16.3	6.4
Income (Loss) from Continuing Operations	0.4	0.2	8.0	1.1
Net Income (Loss)	$ 0.2	$ 0.4	$ 7.8	$ 1.0