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Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Net operating loss		$ 1,573.5	$ 1,235.6
Other		0.0	2.3
Deferred tax assets before valuation allowance		1,573.5	1,237.9
Valuation allowance		(196.5)	(2.3)
Deferred tax assets		1,377.0	1,235.6
Deferred tax liabilities:
Investments	[1]	(1,519.4)	(1,647.7)
Property, plant, and equipment		(4.0)	(15.6)
Other		(5.7)	(6.5)
Deferred tax liabilities		(1,529.1)	(1,669.8)
Net deferred tax asset (liability)		(152.1)	(434.2)
Net deferred tax asset (liability)
Federal		(148.3)	(363.5)
Foreign		0.6	0.6
State		(4.4)	(71.3)
Net deferred tax asset (liability)		$ (152.1)	$ (434.2)
[1] Our deferred tax liability attributable to investments reflects the differences between the book and tax carrying values of our investment in the Partnership.

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