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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Consolidated net income $ 181.0 $ 80.3 $ 154.5
Adjustments to reconcile consolidated net income to cash flows from operating activities:      
Depreciation and amortization 64.9 63.9 54.3
Stock-based compensation expense 11.3 11.0 9.4
Deferred income taxes (15.1) 28.2 (22.7)
Impairment and other non-cash expenses, net 39.8 11.6 24.1
Changes in operating assets and liabilities, net of acquisitions:      
Accounts receivable (30.5) (55.5) (8.4)
Inventories (35.5) (6.6) (43.2)
Accounts payable and accrued expenses 5.0 33.7 (19.6)
Income taxes payable 4.0 5.2 (26.8)
Deferred revenue 7.1 4.0 4.9
Customer advances 3.5 (27.8) (7.3)
Other changes in operating assets and liabilities 4.2 6.4 11.6
Net cash provided by operating activities 239.7 154.4 130.8
Cash flows from investing activities:      
Purchases of short-term investments   (118.5) (126.5)
Maturities of short-term investments 117.0 186.8 165.0
Cash paid for acquisitions, net of cash acquired (191.6) (66.3) (24.3)
Purchases of property, plant and equipment (49.2) (43.7) (37.1)
Proceeds from sales of property, plant and equipment 0.4 11.5 1.1
Net cash used in investing activities (123.4) (30.2) (21.8)
Cash flows from financing activities:      
Repayments of revolving lines of credit (218.1) (130.0)  
Proceeds from revolving lines of credit 129.4 154.0 146.0
Repayments of Note Purchase Agreement   (20.0)  
Repayment of other debt, net (4.8) (0.9) (0.1)
Proceeds from issuance of common stock, net 9.4 20.0 11.5
Payment of contingent consideration (2.3) (3.5)  
Payment of dividends to common stockholders (25.1) (25.4) (25.8)
Repurchase of common stock   (152.2) (160.0)
Cash payments to noncontrolling interest (0.9) (1.0) (0.7)
Excess tax benefits related to stock option awards     1.2
Net cash used in financing activities (112.4) (159.0) (27.9)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (6.5) 17.8 (6.4)
Net change in cash, cash equivalents and restricted cash (2.6) (17.0) 74.7
Cash, cash equivalents and restricted cash at beginning of period 328.9 345.9 271.2
Cash, cash equivalents and restricted cash at end of period 326.3 328.9 345.9
Supplemental cash flow information:      
Cash paid for interest 11.7 15.2 12.5
Cash paid for taxes $ 60.5 $ 53.1 $ 72.4