Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net income	$ 293.6	$ 239.5
Reconciliation of net income to net cash provided by operating activities:
Depreciation	67.9	73.3
Amortization	96.8	95.7
Lease expense	20.3	20.9
Stock-based compensation	14.0	21.0
Loss on extinguishment of debt	0.0	8.8
Deferred taxes	(2.0)	(2.4)
Other operating activities, net	16.9	17.9
Changes in assets and liabilities, excluding effects of acquisitions:
Receivables	(268.7)	(34.0)
Inventories	(72.4)	(5.7)
Contract assets	11.7	4.7
Prepaid expenses and other assets	(9.3)	15.8
Accounts payable	134.9	(1.9)
Accrued and other current liabilities	(4.4)	(5.4)
Contract liabilities	11.3	15.9
Other long-term liabilities	(26.7)	(23.9)
Net cash provided by operating activities	283.9	440.2
Investing activities:
Acquisitions, net of cash acquired	(1,573.9)	(35.4)
Proceeds from sale of discontinued operation, net of cash disposed	247.7	0.0
Capital expenditures	(88.9)	(72.7)
Investment in securities	(10.2)	0.0
Other investing activities, net	2.1	1.4
Net cash used in investing activities	(1,423.2)	(106.7)
Financing activities:
Proceeds from notes	842.6	740.7
Repayment of notes	0.0	(258.5)
Borrowings from revolving credit facility	650.0	500.0
Repayments of revolving credit facility	(650.0)	(500.0)
Financing costs	(1.7)	(24.2)
Repurchases of common stock	(290.6)	(341.7)
Dividends paid	(84.2)	(84.5)
Proceeds from exercise of stock options	77.4	12.9
Withholding tax paid related to stock-based compensation	(8.4)	(7.4)
Other financing activities, net	(1.2)	(0.6)
Net cash provided by financing activities	533.9	36.7
Effect of foreign currency exchange rate changes on cash and cash equivalents	(1.2)	(2.4)
Change in cash and cash equivalents	(606.6)	367.8
Less: change in cash and cash equivalents of discontinued operations	(5.1)	(1.1)
Cash and cash equivalents at beginning of period	897.1	342.5
Cash and cash equivalents at end of period	$ 295.6	$ 711.4