Income Taxes (Table 4) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Net operating loss and other carryforwards	$ 6,598.0	$ 5,873.2
Property and equipment, net	2,028.9	2,583.1
Debt	1,626.3	1,611.7
Intangible assets	99.5	112.4
Derivative instruments	68.3	173.1
Other future deductible amounts	399.6	272.5
Deferred tax assets	10,820.6	10,626.0
Valuation allowance	(6,015.4)	(6,395.6)
Deferred tax assets, net of valuation allowance	4,805.2	4,230.4
Deferred tax liabilities:
Property and equipment, net	(1,076.9)	(1,053.4)
Intangible assets	(901.6)	(1,826.5)
Investments (including consolidated partnerships)	(485.9)	(374.5)
Derivative instruments	(175.5)	(280.7)
Other future taxable amounts	(448.4)	(138.1)
Deferred tax liabilities	(3,088.3)	(3,673.2)
Net deferred tax asset	$ 1,716.9	$ 557.2