Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net income	$ 472.8	$ 611.1	$ 365.5
Reconciliation of net income to cash flows provided by operating activities:
Depreciation	88.4	86.4	84.9
Amortization	117.0	104.2	84.2
Operating Lease, Expense	27.5	0.0	0.0
Stock-based compensation, net of tax benefit	26.1	23.9	13.2
Deferred taxes	(8.9)	(0.8)	(58.5)
Gain on sale of discontinued operations, net of tax	0.0	(250.4)	0.0
Other operating activities, net	5.4	(18.8)	13.9
Changes in assets and liabilities, excluding effects of acquisitions:
Receivables	(25.7)	(54.5)	(53.9)
Inventories	(1.9)	(29.0)	(48.5)
Prepaid expenses and other assets	(3.6)	(2.0)	(20.1)
Accounts payable	16.5	(39.5)	42.7
Accrued expenses	5.2	(99.9)	20.6
Deferred revenues	18.5	11.8	19.3
Other long-term liabilities	(34.2)	(3.3)	(4.6)
Net cash provided by operating activities	703.1	339.2	458.7
Investing activities
Acquisitions, net of cash acquired	(616.4)	(19.5)	(934.3)
Capital expenditures	(88.9)	(120.7)	(159.9)
Proceeds from sale of discontinued operation	0.0	758.0	0.0
Other investing activities, net	10.4	11.4	(0.1)
Net cash (used in) provided by investing activities	(694.9)	629.2	(1,094.3)
Financing activities
Proceeds from revolving credit facility	0.0	0.0	1,189.0
Repayments of revolving credit facility	0.0	0.0	(1,189.0)
Proceeds from notes	0.0	0.0	997.2
Repurchases of common stock	(382.1)	(459.8)	(268.4)
Dividends paid	(102.9)	(93.5)	(92.1)
Financing costs	0.0	0.0	(8.3)
Proceeds from exercise of stock options	37.0	22.7	8.4
Withholding tax paid related to stock-based compensation	(10.4)	(10.1)	(9.6)
Other financing activities, net	(2.8)	0.0	0.0
Net cash (used in) provided by financing activities	(461.2)	(540.7)	627.2
Effect of foreign currency exchange rate changes on cash and cash equivalents	0.6	(1.1)	2.7
Change in cash and cash equivalents	(452.4)	426.6	(5.7)
Less: change in cash and cash equivalents of discontinued operations	0.0	1.3	1.0
Cash and cash equivalents
Beginning of period	803.6	378.3	385.0
End of period	$ 351.2	$ 803.6	$ 378.3