Business Segment Information and Geographic Data - Additional Information (Details) $ in Millions		12 Months Ended
	Jan. 23, 2017 USD ($) director	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 segment	Jan. 22, 2017
Segment Reporting Information [Line Items]
Number of reporting segments | segment				3
Pension expense		$ (1.1)	$ (2.9)
Severance costs		1.4	0.6
Loss on abandonment of unused property, plant and equipment		1.6	0.0
Earnest money payment relating to asset sale		1.4
Consulting and other employee costs			5.9
Severance and other costs		0.6	0.7
Property tax credit			$ 2.2
NXSN Acquisition Corp.
Segment Reporting Information [Line Items]
Noncontrolling interest, percentage held by parent	50.00%				100.00%
Senior secured convertible promissory note	$ 25.0
Noncontrolling interest, percentage held by noncontrolling owners	50.00%
Designation right of number of directors | director	2
Number of directors serving on the Board | director	5
GBAM Fund
Segment Reporting Information [Line Items]
Payments to fund investments		5.0
Other Employee Costs
Segment Reporting Information [Line Items]
Reversal of cost		0.4
Connected Data, Inc. | Contingent Consideration Obligations
Segment Reporting Information [Line Items]
Reversal of cost		$ 0.3