Investment in Unconsolidated Affiliates Summarized Income Statement of Equity Method Investment (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 803.7		$ 577.4		$ 1,393.0	$ 2,208.0
Operating Income (Loss)	156.6		129.5		239.7	178.1
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 73.1	$ 279.5	112.9	$ 52.7	$ 352.6	165.6
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			$ 79.0			$ 234.0