CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Consolidated net income	$ 85.4	$ 42.9
Adjustments to reconcile consolidated net income to cash flows from operating activities:
Depreciation and amortization	40.4	40.0
Write-down of demonstration inventories to net realizable value	12.5	15.0
Stock-based compensation expense	6.8	5.8
Deferred income taxes	(32.1)	(1.1)
Loss on disposal of product line		0.2
Other non-cash expenses, net	12.7	9.5
Changes in operating assets and liabilities, net of acquisitions and divestitures:
Accounts receivable	15.4	37.7
Inventories	(73.4)	(40.7)
Accounts payable and accrued expenses	(11.5)	4.8
Income taxes payable, net	(19.8)	(4.5)
Deferred revenue	3.0	(1.2)
Customer advances	(6.5)	(9.7)
Other changes in operating assets and liabilities, net	7.1	(19.1)
Net cash provided by operating activities	40.0	79.6
Cash flows from investing activities:
Purchases of short-term investments	(77.6)	(78.0)
Maturities of short-term investments	122.4	41.3
Cash paid for acquisitions, net of cash acquired	(1.2)
Purchases of property, plant and equipment	(26.0)	(22.8)
Proceeds from sales of property, plant and equipment	0.9	0.7
Net cash provided by (used in) investing activities	18.5	(58.8)
Cash flows from financing activities:
Proceeds from revolving lines of credit	99.0	17.0
Proceeds (repayment) of other debt, net	0.1	(0.4)
Proceeds from issuance of common stock, net	10.2	7.0
Payment of contingent consideration		(3.0)
Repurchase of common stock	(143.5)	(24.9)
Changes in restricted cash	0.6	1.4
Payment of dividends	(19.4)
Cash payments to noncontrolling interest	(0.7)	(0.5)
Excess tax benefits related to stock option awards	0.3	2.2
Net cash used in financing activities	(53.4)	(1.2)
Effect of exchange rate changes on cash and cash equivalents	6.5	(8.1)
Net change in cash and cash equivalents	11.6	11.5
Cash and cash equivalents at beginning of period	267.1	319.5
Cash and cash equivalents at end of period	$ 278.7	$ 331.0