Segment Information - Reconciliation of Adjusted EBITDA to Net Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting [Abstract]
Net income attributable to common stockholders	$ 1.5	$ 12.0	$ 24.7	$ 49.3
Net (loss) income attributable to the non-controlling interests	(0.1)	(0.2)	0.6	0.5
Loss (income) from discontinued operations, net of tax	13.3	(61.4)	(14.1)	(108.3)
Income tax (benefit) expense	(6.8)	30.0	(17.2)	39.9
Interest expense, net	18.2	78.3	56.3	155.5
Depreciation expense	10.4	11.2	20.7	22.9
Amortization expense	28.4	28.4	56.8	56.9
EBITDA	64.9	98.3	127.8	216.7
Adjustments to reconcile to Adjusted EBITDA:
Restructuring expense	2.8	1.6	4.0	3.3
Integration costs	0.3	3.5	1.7	4.5
Foreign exchange loss (gain) on foreign denominated external and internal long-term debt	28.7	4.6	0.4	(3.1)
Debt refinancing costs	0.3	0.0	61.0	0.0
Change in fair value of contingent consideration	0.5	1.0	2.9	1.5
Gain on sale of equity investment	0.0	0.0	0.0	(11.3)
Other, net	3.0	0.4	1.3	1.9
Adjusted EBITDA	$ 100.5	$ 109.4	$ 199.1	$ 213.5