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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Operating activities:    
Net income $ 44.8 $ 50.3
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 21.9 19.3
Stock-based compensation expense 3.9 4.2
Deferred income taxes 6.0 4.0
Changes in operating assets and liabilities (11.6) (52.0)
Net cash provided by operating activities 65.0 25.8
Investing activities:    
Purchases of properties and equipment (16.3) (9.4)
Proceeds from sales of properties and equipment 0.5 0.0
Payments for acquisition-related activity (6.2) 0.0
Proceeds from acquisition-related activity 0.8 0.0
Net cash used for investing activities (21.2) (9.4)
Financing activities:    
Increase (decrease) in revolving lines of credit, net 27.7 (3.1)
Purchases of treasury stock (13.5) (1.0)
Redemptions of common stock to satisfy withholding taxes related to stock-based compensation (6.6) (1.6)
Cash dividends paid to stockholders (9.7) (9.6)
Proceeds from stock-based compensation activity 0.5 0.0
Other, net 0.1 (0.1)
Net cash used for financing activities (1.5) (15.4)
Effects of foreign exchange rate changes on cash and cash equivalents (0.3) 0.2
Increase in cash and cash equivalents 42.0 1.2
Cash and cash equivalents at beginning of year 31.6 37.4
Cash and cash equivalents at end of period $ 73.6 $ 38.6