CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings	$ 67,500,000	$ 73,300,000	$ 80,200,000
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation	29,600,000	25,500,000	22,700,000
Amortization expense (including debt issuance costs)	9,900,000	9,800,000	3,900,000
Deferred income tax (benefit) expense	(1,300,000)	4,800,000	(19,600,000)
Loss on extinguishment of debt	400,000	1,400,000	0
Pension settlement charges	21,000,000.0	5,700,000	2,200,000
Inventory obsolescence	2,000,000.0	1,700,000	1,900,000
Unrealized foreign currency losses	2,000,000.0	500,000	1,300,000
Stock-based compensation	10,800,000	9,200,000	9,700,000
Intangible asset impairment charge	6,500,000	0	0
Non-cash write-off of property, plant and equipment	0	0	16,300,000
Other non-cash items	1,800,000	2,800,000	1,800,000
Changes in assets and liabilities, net of effects of acquisitions:
Customer receivables	13,000,000.0	(25,000,000.0)	(5,500,000)
Inventories	(20,900,000)	(16,200,000)	(4,000,000.0)
Prepaid and other current assets	6,200,000	(3,500,000)	(3,400,000)
Accounts payable	(1,400,000)	12,500,000	12,100,000
Other current liabilities	(8,900,000)	13,600,000	(15,900,000)
Other noncurrent assets and liabilities	0	(7,900,000)	0
Cash provided by operating activities	138,200,000	108,200,000	103,700,000
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(49,900,000)	(40,300,000)	(40,600,000)
Purchase of businesses, net of cash acquired	(30,900,000)	(308,000,000.0)	0
Proceeds from sales of assets	100,000	0	0
Cash used in investing activities	(80,700,000)	(348,300,000)	(40,600,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from revolving credit facility	417,500,000	490,500,000	310,000,000.0
Repayment of revolving credit facility	(413,500,000)	(383,000,000.0)	(338,000,000.0)
Proceeds from term loans	0	350,200,000	0
Repayment of term loans	(17,100,000)	(177,900,000)	0
Capitalized debt issuance costs	(1,500,000)	(4,600,000)	0
Payment of fees related to debt extinguishment	0	(1,000,000.0)	0
Payment of dividends	(32,800,000)	(30,000,000.0)	(30,200,000)
Proceeds from the issuance of common stock	0	0	600,000
Purchase of common stock for treasury	(3,300,000)	(4,400,000)	(10,900,000)
Contingent purchase price payment	0	0	(6,000,000.0)
Cash (used in) provided by financing activities	(50,700,000)	239,800,000	(74,500,000)
Effect of exchange rate changes on cash and cash equivalents	100,000	(300,000)	3,700,000
Net increase (decrease) in cash and cash equivalents	6,900,000	(600,000)	(7,700,000)
Cash and cash equivalents at beginning of year	1,600,000	2,200,000	9,900,000
Cash and cash equivalents at end of year	8,500,000	1,600,000	2,200,000
Supplemental disclosure of cash flow information:
Cash paid for interest, net of amounts capitalized	20,300,000	18,300,000	7,600,000
Cash paid for income taxes, net of refunds received	$ 12,500,000	$ 9,600,000	$ 22,400,000