Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities
Net income	$ 61.8	$ 68.5
Reconciliation of net income to net cash provided by operating activities:
Depreciation	19.6	18.4
Amortization	19.2	15.1
Stock-based compensation, net of tax benefit	3.2	2.8
Other operating activities, net	0.6	1.2
Changes in assets and liabilities, excluding effects of acquisitions:
Receivables	(34.1)	(1.3)
Inventories	(33.8)	(20.0)
Prepaid expenses and other assets	3.3	6.2
Accounts payable	31.2	27.1
Accrued expenses	(46.6)	(17.5)
Deferred revenues	7.8	5.5
Other long-term liabilities	(0.3)	3.0
Net cash provided by operating activities	31.9	109.0
Investing activities
Capital expenditures	(30.4)	(18.7)
Acquisitions, net of cash acquired	(225.8)	(8.1)
Net cash used in investing activities	(256.2)	(26.8)
Financing activities
Dividends paid	(22.7)	(19.5)
Proceeds from revolving credit facility	50.0	0.0
Repayment of revolving credit facility	(50.0)	0.0
Proceeds from exercise of stock options, net	(5.4)	4.5
Repurchases of common stock	0.0	(28.5)
Net cash used in financing activities	(28.1)	(43.5)
Effect of foreign currency exchange rate changes on cash and cash equivalents	1.1	1.1
Change in cash and cash equivalents	(251.3)	39.8
Cash and cash equivalents
Beginning of period	385.3	410.7
End of period	$ 134.0	$ 450.5