CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended								12 Months Ended			86 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Income Statement [Abstract]
Sales	$ 1,619.9	$ 1,554.9	$ 1,526.5	$ 1,567.1	$ 1,385.7	$ 1,452.7	$ 1,364.0	$ 1,348.2	$ 6,268.4	$ 5,550.6	$ 2,854.4
Operating expenses:
Cost of goods sold	1,396.2	1,345.6	1,404.1	1,393.7	1,227.0	1,284.4	1,236.9	1,175.4	5,539.6	4,923.7	2,486.8
Selling and administration									350.7	323.2	186.3
Restructuring charges									37.6	112.9	2.7	$ 187.2
Acquisition-related costs									12.8	48.8	123.4
Other operating income									3.3	10.6	45.7
Operating income									331.0	152.6	100.9
Earnings of non-consolidated affiliates									1.8	1.7	1.7
Interest expense									217.4	191.9	97.0
Interest income									1.8	3.4	1.1
Income (loss) before taxes									117.2	(34.2)	6.7
Income tax (benefit) provision									(432.3)	(30.3)	8.1
Net income (loss)	$ 489.3	$ 52.7	$ (5.9)	$ 13.4	$ 17.5	$ 17.5	$ (1.0)	$ (37.9)	$ 549.5	$ (3.9)	$ (1.4)
Net (loss) income per common share:
Basic	$ 2.93	$ 0.32	$ (0.04)	$ 0.08	$ 0.11	$ 0.11	$ (0.01)	$ (0.23)	$ 3.31	$ (0.02)	$ (0.01)
Diluted	$ 2.89	$ 0.31	$ (0.04)	$ 0.08	$ 0.10	$ 0.11	$ (0.01)	$ (0.23)	$ 3.26	$ (0.02)	$ (0.01)
Average common shares outstanding:
Basic									166.2	165.2	103.4
Diluted									168.5	165.2	103.4