CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 55.4	$ 36.4	$ 80.3
Reclassification of amounts recognized in the consolidated statement of operations:
Amortization of adjustments to pension and other postretirement benefit liabilities	6.0	6.0	5.9
Pension plan settlement/curtailment losses	1.3	0.8	0.6
Amounts recognized in the consolidated statement of operations	7.3	6.8	6.5
Unrealized foreign currency translation (loss) gain	(3.5)	(7.9)	20.0
Net loss from pension and other postretirement benefit plans	(13.7)	(11.2)	(20.3)
Deferred loss on available-for-sale securities	0.0	0.0	(0.4)
(Loss) income from other comprehensive income items before income taxes	(9.9)	(12.3)	5.8
Benefit for income taxes	(1.7)	(1.0)	(3.0)
Other comprehensive (loss) income	(8.2)	(11.3)	8.8
Comprehensive income	$ 47.2	$ 25.1	$ 89.1