CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES
Net income	$ 55.4	$ 36.4	$ 80.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	38.9	36.1	33.3
Impairment loss (Note 13)	0.0	31.1	0.0
Stock-based compensation	5.6	4.0	6.4
Deferred income tax provision	3.4	(1.9)	(0.2)
Pension curtailment (gain)/settlement charge, net of plan payments (Note 8)	(1.4)	1.8	0.6
Loss on asset dispositions	0.1	0.3	0.2
Non-cash effects of changes in liabilities for uncertain income tax positions	(0.7)	0.1	(0.1)
Net cash used in changes in operating working capital, net of effect of acquisitions (Note 15)	(0.6)	(1.0)	(11.8)
Pension and other post-employment benefits	(3.7)	(12.3)	(8.0)
Other	0.6	(1.9)	(0.7)
NET CASH PROVIDED BY OPERATING ACTIVITIES	97.6	92.7	100.0
INVESTING ACTIVITIES
Capital expenditures	(21.4)	(38.1)	(42.7)
Business acquisition (Note 4)	0.0	0.0	(43.1)
Asset acquisition	0.0	0.0	(8.0)
Proceeds from sale of property, plant and equipment (Note 13)	0.0	5.0	0.0
Sales (purchases) of marketable securities	(0.4)		(0.6)
Sales (purchases) of marketable securities		0.1
Other	(1.5)	(1.3)	(0.6)
NET CASH USED IN INVESTING ACTIVITIES	(23.3)	(34.3)	(95.0)
FINANCING ACTIVITIES
Proceeds from issuance of long-term debt (Note 7)	163.5	272.8	323.7
Debt issuance costs (Note 7)	(0.4)	(1.8)	(0.3)
Repayments of long-term debt (Note 7)	(201.6)	(285.6)	(293.3)
Cash dividends paid	(30.5)	(27.8)	(25.1)
Shares purchased (Note 10)	(6.2)	(10.8)	(9.3)
Proceeds from exercise of stock options	0.0	0.6	0.4
Other	0.0	0.0	0.1
NET CASH USED IN FINANCING ACTIVITIES	(75.2)	(52.6)	(3.8)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	0.0	(0.4)	0.2
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(0.9)	5.4	1.4
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	9.9	4.5	3.1
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 9.0	$ 9.9	$ 4.5