CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Consolidated net income	$ 154.5	$ 104.9	$ 59.6
Adjustments to reconcile consolidated net income to cash flows from operating activities:
Depreciation and amortization	54.3	53.3	59.7
Write-down of demonstration inventories to net realizable value	16.5	19.4	28.2
Stock-based compensation expense	9.4	8.0	9.4
Deferred income taxes	(22.7)	(29.4)	(9.2)
Gain (loss) on disposal of product lines		0.2	(8.3)
Impairment and other non-cash expenses, net	7.6	26.5	14.2
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(8.4)	45.0	(14.5)
Inventories	(43.2)	(5.4)	4.6
Accounts payable and accrued expenses	(19.6)	12.6	9.0
Income taxes payable, net	(26.8)	22.7	5.6
Deferred revenue	4.9	3.8	12.9
Customer advances	(7.3)	1.4	(48.2)
Other changes in operating assets and liabilities, net	11.6	(33.8)	(8.7)
Net cash provided by operating activities	130.8	229.2	114.3
Cash flows from investing activities:
Purchase of short-term investments	(126.5)	(159.4)	(211.6)
Maturity of short-term investments	165.0	118.7	19.0
Cash paid for acquisitions, net of cash acquired	(24.3)	(28.6)	(3.9)
Proceeds from disposal of product lines		0.2	25.3
Purchases of property, plant and equipment	(37.1)	(34.2)	(33.8)
Proceeds from sales of property, plant and equipment	1.1	0.9	3.1
Net cash used in investing activities	(21.8)	(102.4)	(201.9)
Cash flows from financing activities:
Repayments of revolving lines of credit		(129.5)
Proceeds from revolving lines of credit	146.0	42.0
Repayment of other debt, net	(0.1)	(0.6)	(0.8)
Proceeds from issuance of common stock, net	11.5	10.8	7.9
Payment of contingent consideration		(3.0)
Payment of dividends to common stockholders	(25.8)
Repurchase of common stock	(160.0)	(90.0)
Changes in restricted cash	0.7	1.4	0.7
Cash payments to noncontrolling interests	(0.7)	(1.3)	(1.1)
Excess tax benefits related to stock option awards	1.2	2.2
Net cash (used in) provided by financing activities	(27.2)	(168.0)	6.7
Effect of exchange rate changes on cash and cash equivalents	(6.5)	(11.2)	(38.3)
Net change in cash and cash equivalents	75.3	(52.4)	(119.2)
Cash and cash equivalents at beginning of year	267.1	319.5	438.7
Cash and cash equivalents at end of year	342.4	267.1	319.5
Supplemental cash flow information:
Cash paid for interest	12.5	12.2	12.7
Cash paid for taxes	$ 72.4	$ 56.6	$ 55.9