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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
OPERATING ACTIVITIES      
Net income $ 309.5 $ 46.8 $ 90.0
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 85.2 78.8 54.7
Gain on sale of business (249.4) 0.0 (36.9)
Asset impairments 16.0 0.0 0.0
Gain on bargain purchase (5.0) 0.0 0.0
Interest accretion of convertible notes discount 8.0 7.6 9.1
Financing costs amortization 4.3 3.0 1.3
Employee share-based compensation expense 8.9 9.0 6.9
Unrealized (gain) loss on investment in equity securities (13.1) 0.1 0.0
Unrealized foreign currency transaction (gain) loss 2.3 0.6 (2.2)
Deferred income tax expense (benefit) 1.0 (16.2) 5.3
Other non-cash operating activities 1.5 0.8 (2.4)
Changes in assets and liabilities, net of acquisitions:      
Accounts receivable (10.1) 23.6 32.5
Inventory (34.9) 9.4 (35.6)
Unbilled contract revenues and other assets (5.0) (1.6) (3.7)
Accounts payable and other liabilities 62.8 (20.9) (35.7)
Customer advances and billings in excess of contract revenue (9.3) (7.1) 5.5
Net Cash Provided By Operating Activities 172.7 133.9 88.8
INVESTING ACTIVITIES      
Proceeds from sale of businesses 317.5 0.0 133.5
Acquisition of businesses, net of cash acquired (51.9) (603.9) (225.8)
Investments [1] (50.8) (3.3) 0.0
Capital expenditures (37.9) (36.2) (36.4)
Proceeds from sale of assets 7.9 0.0 0.0
Government grants 0.2 0.7 0.8
Net Cash Provided By (Used In) Investing Activities 185.0 (642.7) (127.9)
FINANCING ACTIVITIES      
Borrowings on revolving credit facilities 215.0 235.8 411.7
Repayments on revolving credit facilities (223.1) (451.1) (316.8)
Repurchase of convertible notes 0.0 0.0 (57.1)
Borrowings on term loan 0.0 450.0 0.0
Repayments on term loan (344.1) (2.8) (5.9)
Payments for debt issuance costs (1.0) (13.6) (1.4)
Issuance of shares 0.0 295.8 0.0
Payments for equity issuance costs 0.0 (9.5) 0.0
Proceeds from exercise of stock options 11.0 9.4 10.8
Common stock repurchases from share-based compensation plans (1.9) (2.0) (2.7)
Common stock repurchases (19.3) 0.0 0.0
Dividend distribution to noncontrolling interests 0.0 (0.4) (0.4)
Net Cash (Used in) Provided By Financing Activities (363.4) 511.6 38.2
Effect of exchange rate changes on cash and cash equivalents 11.8 (1.9) (11.4)
Net (decrease) increase in cash, cash equivalents, restricted cash, and restricted cash equivalents [2] 6.1 0.9 (12.3)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period 120.0 [3] 119.1 [3] 131.4
CASH, CASH EQUIVALENTS, RESTRICTED CASH, AND RESTRICTED CASH EQUIVALENTS AT END OF PERIOD [3] $ 126.1 $ 120.0 $ 119.1
[1] Non-cash investing activities of $7.0 related to the conversion of a note receivable into an investment in equity securities during the year ended December 31, 2019. Refer to Note 6, “Investments” for further information.
[2] Net increase (decrease) in cash, cash equivalents, restricted cash, and restricted cash equivalents represents cash flows of consolidated operations for all periods presented. For cash flows of discontinued operations, refer to Note 3, “Discontinued Operations.”
[3] Refer to Note 10, “Debt and Credit Arrangements,” for further information regarding restricted cash and restricted cash equivalents balances.