Business Segments - Reconciliation of Segment Operating Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reconciliation of reportable segment operating income to consolidated income before income taxes
Segment operating income (loss) from continuing operations	$ 59.1	$ (0.1)	$ 109.4	$ 18.0
Interest expense	(165.3)	(166.4)	(331.0)	(330.7)
Earnings from equity investments	8.0	3.3	11.2	6.4
Gain on early extinguishment of debt	25.2	0.0	25.2	0.0
Other income (expense), net	1.7	(4.3)	2.4	(9.9)
Net loss from continuing operations before income taxes	(71.3)	(167.5)	(182.8)	(316.2)
Operating Segments
Reconciliation of reportable segment operating income to consolidated income before income taxes
Segment operating income (loss) from continuing operations	118.3	55.5	221.2	130.7
Unallocated corporate costs
Reconciliation of reportable segment operating income to consolidated income before income taxes
Segment operating income (loss) from continuing operations	$ (59.2)	$ (55.6)	$ (111.8)	$ (112.7)