Segment Information - Reconciliation of Adjusted EBITDA to Net Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting [Abstract]
Net loss attributable to common stockholders	$ (408.9)	$ (69.2)	$ (359.6)	$ (154.7)
Net income attributable to the non-controlling interests	3.0	2.9	3.5	4.8
Loss (income) from discontinued operations, net of tax	401.6	29.4	293.3	(23.1)
Income tax (benefit) expense	(18.8)	(1.6)	21.1	20.2
Interest expense, net	77.9	84.7	233.4	256.3
Depreciation expense	10.9	12.3	33.8	34.8
Amortization expense	27.8	27.7	84.7	81.7
EBITDA	93.5	86.2	310.2	220.0
Adjustments to reconcile to Adjusted EBITDA:
Restructuring expense	1.0	8.9	4.3	16.2
Acquisition and integration costs	5.2	0.4	9.7	3.9
Legal settlement	0.0	0.0	0.0	(10.6)
Foreign exchange loss on foreign denominated external and internal long-term debt	3.8	11.5	0.7	49.3
Debt refinancing costs	0.0	0.8	0.0	14.6
Gain on sale of equity investment	0.0	0.0	(11.3)	0.0
Other, net	4.8	0.0	8.2	4.3
Adjusted EBITDA	$ 108.3	$ 107.8	$ 321.8	$ 297.7