Segment Information - Reconciliation of Adjusted EBITDA to Net Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting [Abstract]
Net loss attributable to common stockholders	$ (8.8)	$ (12.2)	$ (143.6)	$ (38.9)
Net income attributable to the non-controlling interests	0.7	3.1	1.2	3.5
Income tax (expense) benefit	26.9	(0.2)	45.3	24.5
Income (loss) before income taxes and non-controlling interests	18.8	(9.3)	(97.1)	(10.9)
Adjustments to reconcile to Adjusted EBITDA:
Interest expense, net	97.4	51.1	191.2	90.5
Depreciation expense	18.8	13.7	37.0	22.0
Amortization expense	66.6	52.5	131.0	92.2
Long-term compensation issued in connection with acquisitions	0.1	0.2	0.4	1.7
Long-term compensation issued in connection with acquisitions			2.9	2.6
Restructuring expenses	7.1	12.1	12.2	13.7
Manufacturer's profit in inventory purchase accounting adjustments	(0.3)	20.6	11.7	56.7
Acquisition and integration costs	5.2	24.1	24.2	55.4
Non-cash change in fair value of contingent consideration	1.3	0.9	4.1	3.6
Legal settlements	(2.8)	(16.0)	(2.8)	(16.0)
Foreign exchange (gains) losses on foreign denominated external and internal debt	(19.3)	17.9	46.8	(6.1)
Other expense (income)	0.0	0.0	2.6	(3.0)
Adjusted EBITDA	$ 192.9	$ 167.8	$ 361.3	$ 299.8