Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended							9 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2020
Sales	$ 211.7	$ 199.4	$ 425.5	$ 309.2	$ 174.6	$ 175.2	$ 345.9	$ 836.6	$ 695.7	$ 1,244.1	$ 1,145.8	$ 1,004.9
Gross profit	33.1	30.2	108.4	58.5	37.6	39.6	84.1	171.7	161.3	196.8	230.2	219.8
Selling, general and administrative expenses								92.7	86.4	153.9	123.1	116.8
Operating earnings								79.0	74.9	42.9	107.1	103.0
Other expense (income):
Interest expense								44.3	47.2	55.2	59.8	62.7
Gain on foreign exchange								(0.6)	(10.8)	(14.9)	5.6	(4.6)
Net loss in equity investees								0.5	0.0	5.2	0.5	0.0
Other (income) expense, net								(0.3)	0.3	(0.3)	(0.2)	0.4
(Loss) earnings before income taxes from continuing operations								35.1	38.2	(2.3)	41.4	44.5
Income tax expense from continuing operations								14.2	10.3	35.0	5.8	1.9
Net (loss) earnings from continuing operations	(4.6)	(16.4)	41.9	14.7	(4.9)	(7.2)	40.0	20.9	27.9	(37.3)	35.6	42.6
Net earnings (loss) from discontinued operations								(234.2)	7.1	12.2	(220.8)	20.5
Net (loss) earnings	$ (56.0)	$ 57.1	$ (214.4)	$ 28.1	$ 4.3	$ (3.3)	$ 34.0	$ (213.3)	$ 35.0	$ (25.1)	$ (185.2)	$ 63.1
Basic net earnings from continuing operations per common share (in dollars per share)	$ (0.14)	$ (0.49)	$ 1.22	$ 0.42	$ (0.15)	$ (0.22)	$ 1.17	$ 0.59	$ 0.80	$ (1.10)	$ 1.01	$ 1.22
Basic net (loss) earnings from discontinued operations per common share (in dollars per share)								(6.89)	0.21	0.36	(6.49)	0.60
Basic net (loss) earnings per common share (in dollars per share)	(1.65)	1.64	(6.32)	0.82	0.12	(0.11)	0.99	(6.30)	1.01	(0.74)	(5.48)	1.83
Diluted net earnings from continuing operations per common share (in dollars per share)	(0.14)	(0.49)	1.21	0.42	(0.15)	(0.22)	1.16	0.58	0.79	(1.10)	1.00	1.22
Diluted net (loss) earnings from discontinued operations per common share (in dollars per share)								(6.89)	0.21	0.36	(6.49)	0.60
Diluted net (loss) earnings per common share (in dollars per share)	$ (1.65)	$ 1.63	$ (6.32)	$ 0.81	$ 0.11	$ (0.11)	$ 0.99	$ (6.30)	$ 1.00	$ (0.74)	$ (5.48)	$ 1.82
Weighted-average common shares outstanding:
Basic (in shares)	34,043	34,020	33,974	33,958	33,947	33,915	33,892	34,013	33,918	34,120	33,999	33,928
Diluted (in shares)	34,099	34,078	34,012	33,977	33,947	33,915	33,892	34,063	33,918	34,120	34,042	33,928
Shipping and handling cost
Cost of goods and services								$ 220.1	$ 174.6	$ 379.5	$ 295.8	$ 250.3
Product cost
Cost of goods and services								$ 444.8	$ 359.8	$ 667.8	$ 619.8	$ 534.8