Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Net income	$ 12.9	$ 7.3
Adjustments to reconcile net income to net cash provided by operating activities:
Gain from discontinued operations and disposal	0.0	(0.1)
Depreciation and amortization	8.6	5.7
Deferred financing costs	0.1	0.1
Deferred gain	(0.4)	(0.5)
Stock-based compensation expense	0.8	0.4
Pension expense, net of funding	(1.1)	(1.0)
Changes in fair value of contingent consideration and deferred payment	0.3	0.2
Deferred income taxes	0.7	4.0
Changes in operating assets and liabilities	(11.6)	(2.4)
Net cash provided by continuing operating activities	10.3	13.7
Net cash provided by discontinued operating activities	0.0	0.0
Net cash provided by operating activities	10.3	13.7
Investing activities:
Purchases of properties and equipment	(3.0)	(1.1)
Proceeds from sales of properties and equipment	0.1	0.0
Proceeds from acquisition-related activity	3.0	0.0
Net cash provided by (used for) continuing investing activities	0.1	(1.1)
Net cash used for discontinued investing activities	0.0	(1.1)
Net cash provided by (used for) investing activities	0.1	(2.2)
Financing activities:
Decrease in revolving lines of credit, net	(8.6)	0.0
Redemptions of common stock to satisfy withholding taxes related to stock-based compensation	(0.1)	(1.9)
Cash dividends paid to stockholders	(4.2)	(4.2)
Proceeds from stock-based compensation activity	0.1	0.6
Other, net	0.1	(0.1)
Net cash used for continuing financing activities	(12.7)	(5.6)
Net cash used for discontinued financing activities	0.0	0.0
Net cash used for financing activities	(12.7)	(5.6)
Effects of foreign exchange rate changes on cash and cash equivalents	0.2	0.2
(Decrease) increase in cash and cash equivalents	(2.1)	6.1
Cash and cash equivalents at beginning of year	37.5	50.7
Cash and cash equivalents at end of period	$ 35.4	$ 56.8