Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effect of Fourth Quarter Events [Line Items]
Revenues	$ (468.3)	$ (507.6)	$ (574.6)	$ (468.1)	$ (757.1)	$ (858.5)	$ (850.0)	$ (827.6)	$ (2,018.6)	$ (3,293.2)	$ (2,685.1)
OPERATING INCOME (LOSS)	(144.6)	(87.7)	(16.7)	(128.6)	(1,067.3)	115.1	(35.9)	140.8	(377.6)	(847.3)	203.0
Income (loss) from continuing operations					(469.8)	153.7	(106.1)	12.7	(149.4)	(409.5)	52.1
Net income from discontinued operations, net of income tax					1,135.7	17.4	13.8	27.0	0.0	1,193.9	107.3
Net income (loss)	(38.6)	21.1	(76.3)	(55.6)	665.9	171.1	(92.3)	39.7	(149.4)	784.4	$ 159.4
Non-recurring income(loss)	$ (22.4)	$ (2.1)	$ 24.0	$ (50.5)	$ (1,077.8)	$ (11.9)	$ (202.5)	$ 0.4	$ (51.0)	$ (1,291.8)
Basic total									$ (0.85)	$ 4.36	$ 0.89
Diluted total									(0.85)	4.36	0.89
Continuing Operations [Member]
Effect of Fourth Quarter Events [Line Items]
Basic total	$ (0.22)	$ 0.12	$ (0.43)	$ (0.32)	$ (2.62)	$ 0.85	$ (0.59)	$ 0.07	(0.85)	(2.28)	0.29
Diluted total	$ (0.22)	$ 0.12	$ (0.43)	$ (0.32)	(2.62)	0.84	(0.59)	0.07	(0.85)	(2.28)	0.29
Discontinued Operations [Member]
Effect of Fourth Quarter Events [Line Items]
Basic total					6.34	0.10	0.08	0.15	0.00	6.64	0.60
Diluted total					$ 6.34	$ 0.10	$ 0.08	$ 0.15	$ 0.00	$ 6.64	$ 0.60
Revenues as reported [Member]
Effect of Fourth Quarter Events [Line Items]
Revenues		$ (536.7)	$ (608.6)	$ (491.6)	$ (799.6)	$ (910.0)	$ (887.2)	$ (817.5)
Revenues as Adjusted [Member]
Effect of Fourth Quarter Events [Line Items]
Revenues		(507.6)	(574.6)	(468.1)	(757.1)	(858.5)	(850.0)	(827.6)
Change [Member]
Effect of Fourth Quarter Events [Line Items]
Revenues		$ (29.1)	$ (34.0)	$ (23.5)	$ (42.5)	$ (51.5)	$ (37.2)	$ 10.1