Investments in Affiliates - Summary of Financial Information for Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 79.3	$ 71.1
Non-current assets	697.9	755.8
Total assets	777.2	826.9
Current liabilities	27.1	26.8
Non-current liabilities	109.0	149.2
Total liabilities	136.1	176.0
Income Statement
Revenues	191.9	243.6	$ 200.5
Operating costs and expenses	173.0	209.7	166.3
Gross profit (loss)	18.9	33.9	34.2
Income (loss) from Continuing Operations	6.6	17.4	16.0
Net Income (loss)	$ 6.6	$ 16.5	$ 15.5