Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
NET LOSS	$ (7.9)	$ (60.3)	$ (24.0)
OTHER COMPREHENSIVE INCOME (LOSS)
Net change in unrealized holding loss on available-for-sale securities arising during the period, net of tax benefit of $0.1, $0.0 and $0.0 for the years ended December 31, 2020, 2019 and 2018, respectively	(0.4)	(0.3)	(0.3)
Net change in pension liability due to amortization of prior service credit and net actuarial loss, net of tax benefit of $0.5, $0.7 and $1.0 for the years ended December 31, 2020, 2019 and 2018, respectively	1.7	2.1	3.5
Pension settlement charge, net of tax benefit of $7.2 for the year ended December 31, 2019	0.0	24.1	0.0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	(3.4)	(6.6)	6.1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	7.2	(0.2)	(13.8)
Other comprehensive income (loss)	5.1	19.1	(4.5)
COMPREHENSIVE LOSS	$ (2.8)	$ (41.2)	$ (28.5)