CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Consolidated net income	$ 80.3	$ 154.5	$ 104.9
Adjustments to reconcile consolidated net income to cash flows from operating activities:
Depreciation and amortization	63.9	54.3	53.3
Stock-based compensation expense	11.0	9.4	8.0
Deferred income taxes	28.2	(22.7)	(29.4)
Gain (loss) on disposal of product lines			0.2
Impairment and other non-cash expenses, net	11.6	24.1	45.9
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(55.5)	(8.4)	45.0
Inventories	(6.6)	(43.2)	(5.4)
Accounts payable and accrued expenses	33.7	(19.6)	12.6
Income taxes payable, net	5.2	(26.8)	22.7
Deferred revenue	4.0	4.9	3.8
Customer advances	(27.8)	(7.3)	1.4
Other changes in operating assets and liabilities, net	6.4	11.6	(33.8)
Net cash provided by operating activities	154.4	130.8	229.2
Cash flows from investing activities:
Purchase of short-term investments	(118.5)	(126.5)	(159.4)
Maturity of short-term investments	186.8	165.0	118.7
Cash paid for acquisitions, net of cash acquired	(66.3)	(24.3)	(28.6)
Proceeds from disposal of product lines			0.2
Purchases of property, plant and equipment	(43.7)	(37.1)	(34.2)
Proceeds from sales of property, plant and equipment	11.5	1.1	0.9
Net cash used in investing activities	(30.2)	(21.8)	(102.4)
Cash flows from financing activities:
Repayments of revolving lines of credit	(130.0)		(129.5)
Proceeds from revolving lines of credit	154.0	146.0	42.0
Repayments of Note Purchase Agreement	(20.0)
Repayment of other debt, net	(0.9)	(0.1)	(0.6)
Proceeds from issuance of common stock, net	20.0	11.5	10.8
Payment of contingent consideration	(3.5)		(3.0)
Payment of dividends to common stockholders	(25.4)	(25.8)
Repurchase of common stock	(152.2)	(160.0)	(90.0)
Cash payments to noncontrolling interests	(1.0)	(0.7)	(1.3)
Excess tax benefits related to stock option awards		1.2	2.2
Net cash used in financing activities	(159.0)	(27.9)	(169.4)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	17.8	(6.4)	(11.0)
Net change in cash, cash equivalents and restricted cash	(17.0)	74.7	(53.6)
Cash, cash equivalents and restricted cash at beginning of year	345.9	271.2	324.8
Cash, cash equivalents and restricted cash at end of year	328.9	345.9	271.2
Supplemental cash flow information:
Cash paid for interest	15.2	12.5	12.2
Cash paid for taxes	$ 53.1	$ 72.4	$ 56.6