Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net sales	[1]	$ 5,063.3	$ 4,837.4	$ 4,731.7
Cost of sales		3,248.1	3,064.1	2,900.2
Gross profit		1,815.2	1,773.3	1,831.5
Operating expenses
Distribution		100.4	96.1	94.2
Research and development		177.7	187.4	218.6
Selling		579.1	567.0	595.7
Administration		496.0	503.0	435.9
Impairment charges		346.8	184.5	224.4
Restructuring		3.5	26.3	21.0
Other operating expense (income)		(3.7)	4.2	5.2
Total operating expenses		1,699.8	1,568.5	1,595.0
Operating income		115.4	204.8	236.5
Change in financial assets		96.4	(22.1)	(188.7)
Interest expense, net		131.2	121.7	128.0
Other (income) expense, net		17.2	(66.0)	6.1
Loss on extinguishment of debt		20.0	0.2	0.5
Income (loss) before income taxes		(149.4)	171.0	290.6
Income tax expense		13.2	24.9	159.6
Net income (loss)		$ (162.6)	$ 146.1	$ 131.0
Earnings (loss) per share
Basic (in dollars per share)		$ (1.19)	$ 1.07	$ 0.95
Diluted (in dollars per share)		$ (1.19)	$ 1.07	$ 0.95
Weighted-average shares outstanding
Basic (in dollars per share)		136.1	136.0	137.8
Diluted (in dollars per shares)		136.1	136.5	138.3
Revenue, Product and Service [Extensible List]		us-gaap:ProductMember
Cost, Product and Service [Extensible List]		us-gaap:ProductMember

[1] The net sales by geography is derived from the location of the entity that sells to a third party.