Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 2,009.2	$ 2,387.3	$ 6,229.6	$ 7,131.9
Cost of goods sold (exclusive of depreciation)	1,513.2	1,842.4	4,711.9	5,513.3
Operating expenses:
Outbound freight and handling	85.9	96.8	258.1	275.1
Warehousing, selling and administrative	245.5	269.2	770.5	803.4
Other operating expenses, net	21.4	30.2	69.1	258.8
Depreciation	41.6	41.6	123.7	114.5
Amortization	14.7	12.1	45.3	45.1
Impairment charges	20.7	7.0	37.6	7.0
Total operating expenses	429.8	456.9	1,304.3	1,503.9
Operating income	66.2	88.0	213.4	114.7
Other (expense) income:
Interest income	0.5	0.6	1.7	2.3
Interest expense	(28.2)	(37.4)	(87.4)	(111.2)
Loss on sale of business	(9.3)	0.0	(17.9)	0.0
Loss on extinguishment of debt	0.0	0.0	(1.8)	(0.7)
Other (income) expense, net	2.4	(5.5)	(7.4)	(17.2)
Total other expense	(34.6)	(42.3)	(112.8)	(126.8)
Income (loss) before income taxes	31.6	45.7	100.6	(12.1)
Income tax expense	2.7	43.2	14.0	38.4
Net income (loss) from continuing operations	28.9	2.5	86.6	(50.5)
Net income from discontinued operations	0.0	0.0	0.0	5.4
Net income (loss)	$ 28.9	$ 2.5	$ 86.6	$ (45.1)
Income (loss) per common share:
Basic from continuing operations (in dollars per share)	$ 0.17	$ 0.01	$ 0.51	$ (0.31)
Basic from discontinued operations (in dollars per share)	0	0	0	0.03
Basic income (loss) per common share (in dollars per share)	0.17	0.01	0.51	(0.28)
Diluted from continuing operations (in dollars per share)	0.17	0.01	0.51	(0.31)
Diluted from discontinued operations (in dollars per share)	0	0	0	0.03
Diluted income (loss) per common share (in dollars per share)	$ 0.17	$ 0.01	$ 0.51	$ (0.28)
Weighted average common shares outstanding:
Basic (in shares)	169.0	168.6	168.9	162.6
Diluted (in shares)	169.8	169.5	169.7	162.6