CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Statement of Cash Flows [Abstract]
Net (loss) earnings	$ (16.2)	$ 15.7	$ (11.9)	$ (17.2)
Adjustments to reconcile net loss to cash from operating activities:
Depreciation and amortization			39.7	44.4
Stock-based compensation			20.8	18.6
Impairment of intangibles		16.2	0.0	16.2
Non-cash interest expense and amortization of debt issuance costs			5.7	5.5
Impairment charges on fixed and other assets		5.1	0.0	5.4
Loss (gain) on disposal of fixed assets			0.2	(0.2)
Deferred income taxes			(0.9)	(0.6)
Gain on sale of business			1.6	0.0
Other, net			(2.4)	5.5
Cash effect of changes in assets and liabilities (excluding effects of foreign exchange):
Receivables, net			(8.5)	(4.1)
Inventories, net			(29.7)	(35.8)
Prepaid and other current assets			(2.6)	(0.8)
Accounts payable			(1.7)	(4.4)
Accrued compensation and employee benefits			2.6	(5.4)
Other accrued expenses			(4.8)	5.2
Accrued taxes			33.4	(3.9)
Other non-current assets and non-current liabilities			1.0	2.7
Net cash provided by operating activities			39.3	31.1
Investing Activities
Proceeds from the sale of business			10.0	0.0
Additions to property, plant, and equipment			(58.0)	(43.4)
Acquisitions of business (net of cash acquired)			(18.0)	(2.5)
Proceeds from the sale of property, plant, and equipment			0.0	0.5
Net cash used in investing activities			(66.0)	(45.4)
Financing Activities
Payments under revolving credit facility			10.0	0.0
Borrowings under revolving credit facility			0.0	15.0
Tax on restricted stock unit vesting			(4.5)	(4.9)
Payments of capital lease obligations			(1.3)	(1.2)
Payment of consideration owed for acquisitions			(1.0)	0.0
Net proceeds from exercise of stock-based awards			0.5	3.3
Principal payments on term loan debt			0.0	(7.2)
Net cash (used in) provided by financing activities			(16.3)	5.0
Effect of exchange rate changes on cash and cash equivalents			(0.1)	0.8
Net decrease in cash and cash equivalents			(43.1)	(8.5)
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations			111.7	63.4	$ 63.4
Cash and cash equivalents from discontinued operations at beginning of period			0.0	2.8	2.8
Cash and cash equivalents from discontinued operations at end of period	0.0	(3.7)	0.0	(3.7)	0.0
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations	$ 68.6	$ 54.0	68.6	54.0	$ 111.7
Supplemental information - cash paid for:
Income taxes			10.3	8.8
Interest			$ 5.4	$ 7.3