Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities:
Net income	$ 523.0	$ 250.4
Reconciliation of net income to net cash provided by operating activities:
Depreciation	64.6	61.5
Amortization	78.6	59.2
Stock-based compensation, net of tax benefit	17.8	11.9
Deferred taxes	(9.0)	(3.1)
(Gain) loss on sale of assets	(6.4)	0.3
Gain on sale of discontinued operation, net of tax	(251.0)	0.0
Other operating activities, net	0.4	6.3
Changes in assets and liabilities, excluding effects of acquisitions:
Receivables	(207.2)	(155.3)
Inventories	(61.9)	(45.9)
Prepaid expenses and other assets	(0.9)	1.4
Accounts payable	12.6	61.3
Accrued expenses	(66.2)	39.9
Deferred revenues	11.8	15.4
Other long-term liabilities	(3.6)	(3.7)
Net cash provided by operating activities	102.6	299.6
Investing activities:
Proceeds from sale of discontinued operation	758.0	0.0
Capital expenditures	(96.1)	(105.8)
Acquisitions, net of cash acquired	(19.5)	(280.0)
Other investing activities, net	11.4	0.2
Net cash provided by (used in) investing activities	653.8	(385.6)
Financing activities:
Proceeds from revolving credit facility	0.0	491.0
Repayments of revolving credit facility	0.0	(306.0)
Repurchases of common stock	(295.4)	(266.4)
Dividends paid	(69.7)	(69.0)
Withholding tax paid related to stock-based compensation	(9.7)	(8.2)
Proceeds from exercise of stock options	22.3	4.1
Net cash used in financing activities	(352.5)	(154.5)
Effect of foreign currency exchange rate changes on cash and cash equivalents	(0.4)	2.8
Change in cash and cash equivalents	403.5	(237.7)
Less: change in cash and cash equivalents of discontinued operations	(1.3)	(1.6)
Cash and cash equivalents at beginning of period	378.3	385.0
Cash and cash equivalents at beginning of period	$ 780.5	$ 145.7