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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
OPERATING ACTIVITIES      
Net income (loss) $ 6.3   $ (2.9)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 13.7   9.2
Interest accretion of convertible notes discount 2.5   3.3
Employee share-based compensation expense 3.2   6.3
Financing costs amortization 0.3   0.3
Unrealized foreign currency transaction (gain) loss (0.4)   0.2
Other non-cash operating activities 0.3   0.6
Changes in assets and liabilities, net of acquisitions:      
Accounts receivable 17.9 $ (15.4) 16.2
Inventory (21.6)   (20.9)
Unbilled contract revenues and other assets 6.4 (5.8) (4.9)
Accounts payable and other liabilities (18.6)   (10.6)
Customer advances and billings in excess of contract revenue 13.0 14.4 4.4
Net Cash Provided By Operating Activities 23.0   1.2
INVESTING ACTIVITIES      
Capital expenditures (6.6)   (8.4)
Government grants 0.1   0.2
Acquisition of businesses, net of cash acquired (12.5)   (23.2)
Net Cash Used In Investing Activities (19.0)   (31.4)
FINANCING ACTIVITIES      
Borrowings on revolving credit facilities 38.0   2.2
Repayments on revolving credit facilities (26.8)   (3.6)
Payments for debt issuance costs (0.2)   0.0
Proceeds from exercise of stock options 1.2   0.0
Common stock repurchases (2.2)   (1.8)
Net Cash Provided By (Used In) Financing Activities 10.0   (3.2)
Effect of exchange rate changes on cash and cash equivalents 3.9   0.7
Net increase (decrease) in cash, cash equivalents, restricted cash, and restricted cash equivalents 17.9   (32.7)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period (1) [1] 131.4   282.9
CASH, CASH EQUIVALENTS, RESTRICTED CASH, AND RESTRICTED CASH EQUIVALENTS AT END OF PERIOD (1) [1] $ 149.3 $ 149.3 $ 250.2
[1] Includes restricted cash of $6.5 ($5.5 in other current assets and $1.0 in other assets) at March 31, 2018 and $8.7 ($7.7 in other current assets and $1.0 in other assets) at December 31, 2017. For further information regarding restricted cash and restricted cash equivalents balances, refer to Note 5, “Debt and Credit Arrangements.”