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Investment in Unconsolidated Affiliates Summarized Income Statement of Equity Method Investment (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 503.5		$ 513.7		$ 934.8	$ 1,003.7
Operating Income (Loss)	125.4		110.0		181.7	159.7
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	85.9	$ (491.8)	100.2	$ 47.1	(405.9)	147.3
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues	515.0		735.0		1,163.0	1,530.0
Cost of Revenue	177.0		317.0		403.0	695.0
Operating Income (Loss)	80.0		167.0		226.0	332.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 35.0		$ 114.8		$ 138.0	$ 228.1

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