Selected Quarterly Data - Summary of Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended																12 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
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 247.6		$ 248.7		$ 224.4		$ 177.8		$ 176.1	[1]	$ 186.7	[1]	$ 172.3	[1]	$ 172.8	[1]	$ 898.5	$ 707.9	$ 768.0
Gross profit	61.6		61.3		54.7		43.6		45.4	[1]	45.3	[1]	45.0	[1]	47.4	[1]	221.2	183.1	225.6
Income from continuing operations	29.3	[2]	12.5	[3]	11.5	[4]	7.2	[5]	12.1	[1],[6]	7.5	[1],[7]	9.4	[1],[8]	10.4	[1],[9]	60.5	39.4	65.8
Gain (loss) from discontinued operations and disposal, net of tax	1.1		0.0		(0.1)		0.1		0.5	[1]	1.0	[1]	(0.3)	[1]	3.2	[1]	1.1	4.4	(2.3)
Net income	$ 30.4		$ 12.5		$ 11.4		$ 7.3		$ 12.6	[1]	$ 8.5	[1]	$ 9.1	[1]	$ 13.6	[1]	$ 61.6	$ 43.8	$ 63.5
Diluted earnings per share:
Earnings from continuing operations (usd per share)	$ 0.48		$ 0.21		$ 0.19		$ 0.12		$ 0.20	[1]	$ 0.12	[1]	$ 0.15	[1]	$ 0.17	[1]	$ 1.00	$ 0.64	$ 1.04
Earnings (loss) from discontinued operations (usd per share)	0.02		0.00		0.00		0.00		0.01	[1]	0.02	[1]	0.00	[1]	0.05	[1]	0.02	0.07	(0.04)
Net earnings per share (usd per share)	$ 0.50		$ 0.21		$ 0.19		$ 0.12		$ 0.21	[1]	$ 0.14	[1]	$ 0.15	[1]	$ 0.22	[1]	$ 1.02	$ 0.71	$ 1.00
Purchase accounting expense	$ 0.5		$ 1.3		$ 2.5		$ 0.5		$ 0.9		$ 2.5		$ 0.5
Acquisition and integration-related expenses	0.5		0.7		1.0		0.5		0.2		0.3		$ 0.4		$ 0.5		$ 2.7	$ 1.4	$ 0.0
Severance costs							0.7
Restructuring charges	0.1		0.1		$ 0.1		$ 0.3		$ 0.1		$ 0.4				1.2		0.6	1.7	0.4
Debt settlement charges															$ 0.3		$ 0.0	$ 0.3	$ 0.0
Impact of change in state tax rate in Illinois			$ 0.6
Preliminary estimate of the impact of the 2017 Tax Act	$ 20.8

[1] The adoption of ASU 2016-09 in the fourth quarter of 2016 did not impact the previously-reported quarterly results for 2016.

[2] Income from continuing operations includes purchase accounting expenses, acquisition and integration-related expenses, restructuring charges, pension settlement charges and hearing loss settlement charges of $0.5 million, $0.5 million, $0.1 million, $6.1 million and $1.5 million, respectively, as well as a $20.8 million net benefit from special tax items, primarily represented by the Company’s preliminary estimate of the impact of the 2017 Tax Act, including the effect of the reduction in the corporate tax rate in the U.S.

[3] Income from continuing operations includes purchase accounting expenses, acquisition and integration-related expenses, and restructuring charges of $1.3 million, $0.7 million and $0.1 million, respectively, as well as $0.6 million of tax expense associated with a change in the enacted state tax rate in Illinois.

[4] Income from continuing operations includes purchase accounting expenses, acquisition and integration-related expenses, and restructuring charges of $2.5 million, $1.0 million and $0.1 million, respectively.

[5] Income from continuing operations includes purchase accounting expenses, acquisition and integration-related expenses, restructuring charges and executive severance costs of $0.5 million, $0.5 million, $0.3 million and $0.7 million, respectively.

[6] Income from continuing operations includes purchase accounting expenses, acquisition and integration-related expenses and restructuring charges of $0.9 million, $0.2 million and $0.1 million, respectively, as well as a $2.2 million net benefit resulting from changes in deferred tax valuation allowances in Canada and the U.K.

[7] Income from continuing operations includes purchase accounting expenses, acquisition and integration-related expenses and restructuring charges of $2.5 million, $0.3 million and $0.4 million, respectively.

[8] Income from continuing operations includes purchase accounting expenses and acquisition and integration-related expenses of $0.5 million and $0.4 million, respectively.

[9] Income from continuing operations includes acquisition and integration-related expenses, restructuring charges and debt settlement charges of $0.5 million, $1.2 million and $0.3 million, respectively.