Investment in Unconsolidated Affiliates Summarized Income Statement of Equity Method Investment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 1,630.6	$ 431.3
Operating Income (Loss)	48.6	56.3
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	52.7	(491.8)
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues	970.0	648.0
Cost of Revenue	519.0	226.0
Operating Income (Loss)	206.0	146.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 155.0	$ 103.0