CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
OPERATING ACTIVITIES
Net income	$ 80.3	$ 73.0	$ 51.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	33.3	32.0	31.5
Stock-based compensation	6.4	5.8	6.5
Excess tax benefit from stock-based compensation (Note 9)	0.0	0.0	(2.6)
Deferred income tax provision	(0.2)	16.9	8.3
Non-cash effects of changes in liabilities for uncertain income tax positions	(0.1)	(1.5)	(0.1)
Pension settlement charge, net of plan payments	0.6	0.8	0.0
Non-cash loss on discontinued operations	0.0	0.0	12.0
Loss (gain) on asset dispositions	0.2	0.1	(0.1)
Net cash (used in) provided by changes in operating working capital, net of effect of acquisitions (Note 15)	(11.8)	(1.2)	1.8
Pension and other post-employment benefits	(8.0)	(10.9)	2.9
Other	(0.7)	0.8	(0.1)
NET CASH PROVIDED BY OPERATING ACTIVITIES	100.0	115.8	111.2
INVESTING ACTIVITIES
Capital expenditures	(42.7)	(68.5)	(48.1)
Purchases of marketable securities	(0.6)	(0.1)	(0.2)
Asset acquisition	(8.0)	0.0	0.0
Net proceeds from sale of discontinued operations	0.0	0.0	5.4
Proceeds from sale of property, plant and equipment	0.0	0.1	0.5
Acquisitions (Note 4)	(43.1)	0.0	(118.2)
Other	(0.6)	0.3	0.5
NET CASH USED IN INVESTING ACTIVITIES	(95.0)	(68.2)	(160.1)
FINANCING ACTIVITIES
Proceeds from issuance of long-term debt (Note 7)	323.7	243.0	151.6
Debt issuance costs	(0.3)	(0.1)	0.0
Repayments of long-term debt (Note 7)	(293.3)	(252.9)	(145.6)
Proceeds from exercise of stock options	0.4	0.4	1.2
Excess tax benefit from stock-based compensation (Note 9)	0.0	0.0	2.6
Cash dividends paid	(25.1)	(22.4)	(20.3)
Shares purchased (Note 10)	(9.3)	(16.4)	(8.4)
Other	0.1	0.0	0.1
NET CASH USED IN FINANCING ACTIVITIES	(3.8)	(48.4)	(18.8)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	0.2	(0.3)	(0.7)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1.4	(1.1)	(68.4)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	3.1	4.2	72.6
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 4.5	$ 3.1	$ 4.2