CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 1,022.5	$ 941.1	$ 1,986.6	$ 1,802.9
Cost of sales	599.6	541.2	1,159.0	1,024.6
Gross profit	422.9	399.9	827.6	778.3
Operating expenses:
Selling, technical, general and administrative	280.0	284.3	557.0	541.7
Research and development	25.9	25.1	49.4	46.7
Total operating expenses	305.9	309.4	606.4	588.4
Operating profit	117.0	90.5	221.2	189.9
Other expense:
Interest expense, net	(79.5)	(85.0)	(157.7)	(174.4)
Foreign exchange (loss) gain	(52.2)	(59.9)	5.8	(72.5)
Other income, net	11.9	5.5	30.9	3.2
Total other expense	(119.8)	(139.4)	(121.0)	(243.7)
(Loss) income before income taxes and non-controlling interests	(2.8)	(48.9)	100.2	(53.8)
Income tax benefit (expense)	14.6	(11.1)	(50.4)	(29.8)
Net income (loss) from continuing operations	11.8	(60.0)	49.8	(83.6)
Net loss (income) attributable to the non-controlling interests	0.2	(1.1)	(0.5)	(1.9)
Net income (loss) attributable to common stockholders	$ 12.0	$ (61.1)	$ 49.3	$ (85.5)
Earnings (Loss) per share
Basic (in dollars per share)	$ 0.04	$ (0.21)	$ 0.17	$ (0.30)
Diluted (in dollars per share)	$ 0.04	$ (0.21)	$ 0.17	$ (0.30)
Weighted average common shares outstanding
Basic (in shares)	288.2	286.1	288.0	285.3
Diluted (in shares)	298.0	286.1	297.9	285.3