CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 456.7	$ 501.6	$ 916.5	$ 994.1
Cost of sales	263.7	286.9	525.2	568.3
Gross profit	193.0	214.7	391.3	425.8
Operating expenses:
Selling, technical, general and administrative	126.4	144.3	268.8	285.1
Research and development	11.1	11.2	21.9	22.6
Total operating expenses	137.5	155.5	290.7	307.7
Operating profit	55.5	59.2	100.6	118.1
Other expense:
Interest expense, net	(18.2)	(78.3)	(56.3)	(155.5)
Foreign exchange (loss) gain	(28.3)	(2.4)	(1.2)	5.1
Other (expense) income, net	(1.1)	1.9	(49.1)	13.7
Total other expense	(47.6)	(78.8)	(106.6)	(136.7)
Income (loss) before income taxes and non-controlling interests	7.9	(19.6)	(6.0)	(18.6)
Income tax benefit (expense)	6.8	(30.0)	17.2	(39.9)
Net income (loss) from continuing operations	14.7	(49.6)	11.2	(58.5)
(Loss) income from discontinued operations, net of tax	(13.3)	61.4	14.1	108.3
Net income	1.4	11.8	25.3	49.8
Net loss (income) attributable to the non-controlling interests	0.1	0.2	(0.6)	(0.5)
Net income attributable to common stockholders	$ 1.5	$ 12.0	$ 24.7	$ 49.3
Earnings (loss) per share
Basic from continuing operations (in dollars per share)	$ 0.06	$ (0.17)	$ 0.04	$ (0.21)
Basic from discontinued operations (in dollars per share)	(0.05)	0.21	0.05	0.38
Basic (in dollars per share)	0.01	0.04	0.09	0.17
Diluted from continuing operations (in dollars per share)	0.06	(0.17)	0.04	(0.21)
Diluted from discontinued operations (in dollars per share)	(0.05)	0.21	0.05	0.38
Diluted (in dollars per share)	$ 0.01	$ 0.04	$ 0.09	$ 0.17
Weighted average common shares outstanding
Basic (in shares)	257.3	288.2	262.7	288.0
Diluted (in shares)	259.6	288.2	265.3	288.0