Segments - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before income taxes		$ 267.5	$ 189.6	$ 82.7
Interest expense, net		159.6	147.0	178.2
Depreciation and amortization		(369.1)	(347.5)	(322.1)
Adjusted EBITDA		796.2	684.1	583.0
Debt extinguishment and refinancing related costs		9.5	13.4	97.6
Foreign exchange remeasurement losses		9.2	7.4	30.6
Long-term employee benefit plan adjustments		1.9	1.4	1.5
Termination benefits and other employee related costs		81.7	35.3	61.8
Consulting and advisory fees		0.0	0.1	10.4
Transition-related costs		(0.2)	(7.7)	0.0
Offering and transactional costs		1.2	18.4	6.0
Stock-based compensation		37.3	38.5	41.1
Other Adjustments		5.2	3.6	5.0
Dividends in respect of noncontrolling interest		(1.0)	(3.0)	(3.0)
Deconsolidation and site closure related impacts		0.0	78.5	68.4
Adjusted Earnings Before Interest Tax Depreciation And Amortization		937.2	885.2	902.4
Gains (losses) on extinguishment of debt		9.5	13.0	88.0
Loss on extinguishment of debt		9.5	13.4	97.6
Contemplated merger and acquisition costs			10.0
Loss on deconsolidation of Venezuela		0.0	(70.9)	0.0
Operating asset impairment			7.6
Impairments		$ 0.0	7.6	10.5
Term Loan [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Loss on extinguishment of debt			(0.4)	(9.6)
VENEZUELA
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Exchange gains (losses)			1.8	23.5
Subsidiaries [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Exchange gains (losses)			$ (1.8)	(23.5)
Subsidiaries [Member] | VENEZUELA
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating asset impairment				57.9
VENEZUELA | Subsidiaries [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Loss on deconsolidation of Venezuela	$ 70.9
Operating asset impairment				$ 68.4