CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Consolidated net income	$ 104.9	$ 59.6	$ 81.8
Adjustments to reconcile consolidated net income to cash flows from operating activities:
Depreciation and amortization	53.3	59.7	61.3
Write-down of demonstration inventories to net realizable value	19.4	28.2	32.7
Stock-based compensation expense	8.0	9.4	6.6
Deferred income taxes	(29.4)	(9.2)	7.4
Gain (loss) on disposal of product lines	0.2	(8.3)	(0.9)
Impairment and other non-cash expenses, net	26.5	14.2	2.1
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	45.0	(14.5)	(19.3)
Inventories	(5.4)	4.6	5.7
Accounts payable and accrued expenses	12.6	9.0	7.0
Income taxes payable, net	22.7	5.6	(28.7)
Deferred revenue	3.8	12.9	4.6
Customer advances	1.4	(48.2)	(12.1)
Other changes in operating assets and liabilities, net	(33.8)	(8.7)	(3.2)
Net cash provided by operating activities	229.2	114.3	145.0
Cash flows from investing activities:
Purchase of short-term investments	(159.4)	(211.6)
Maturity of short-term investments	118.7	19.0
Cash paid for acquisitions, net of cash acquired	(28.6)	(3.9)	(11.6)
Proceeds from disposal of product lines	0.2	25.3	0.5
Purchases of property, plant and equipment	(34.2)	(33.8)	(50.3)
Proceeds from sales of property, plant and equipment	0.9	3.1	1.4
Net cash used in investing activities	(102.4)	(201.9)	(60.0)
Cash flows from financing activities:
Repayments of revolving lines of credit	(129.5)
Proceeds from revolving lines of credit	42.0		19.5
Repayment of other debt, net	(0.6)	(0.8)	(1.6)
Proceeds from issuance of common stock, net	10.8	7.9	8.2
Payment of contingent consideration	(3.0)
Repurchase of common stock	(90.0)
Changes in restricted cash	1.4	0.7	1.0
Cash payments to noncontrolling interests	(1.3)	(1.1)	(0.6)
Excess tax benefit related to stock option awards	2.2
Net cash (used in) provided by financing activities	(168.0)	6.7	26.5
Effect of exchange rate changes on cash and cash equivalents	(11.2)	(38.3)	16.6
Net change in cash and cash equivalents	(52.4)	(119.2)	128.1
Cash and cash equivalents at beginning of year	319.5	438.7	310.6
Cash and cash equivalents at end of year	267.1	319.5	438.7
Supplemental disclosure of cash flow information:
Cash paid for interest	12.2	12.7	12.7
Cash paid for taxes	$ 56.6	$ 55.9	$ 84.3