Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net income	$ 421.7	$ 320.1	$ 472.8
Reconciliation of net income to cash flows provided by operating activities:
Depreciation	92.1	97.4	88.4
Amortization	134.1	126.8	117.0
Lease expense	27.1	28.1	27.5
Stock-based compensation	19.4	29.9	26.1
Loss on extinguishment of debt	0.0	8.8	0.0
Deferred taxes	(5.4)	(27.0)	(8.9)
Other operating activities, net	22.7	21.9	5.4
Changes in assets and liabilities, excluding effects of acquisitions:
Receivables	(206.9)	78.9	1.0
Inventories	(136.8)	16.4	(1.9)
Contract assets	13.1	13.3	(26.7)
Prepaid expenses and other assets	(34.6)	(6.6)	(3.6)
Accounts payable	85.4	(15.2)	16.5
Accrued and other current liabilities	4.6	(5.3)	5.2
Contract Liabilities	13.1	20.5	18.5
Other long-term liabilities	(27.9)	(11.3)	(34.2)
Net cash provided by operating activities	421.7	696.7	703.1
Investing activities:
Acquisitions, net of cash acquired	(1,571.3)	(35.4)	(616.4)
Proceed from sale of discontinued operation, net of cash disposed	247.7	0.0	0.0
Capital expenditures	(134.8)	(95.5)	(88.9)
Investment in securities	(30.2)	0.0	0.0
Other investing activities, net	2.2	8.3	10.4
Net cash used in investing activities	(1,486.4)	(122.6)	(694.9)
Financing activities:
Proceeds from notes	842.6	740.7	0.0
Repayments of notes	0.0	(258.5)	0.0
Borrowings from revolving credit facility	650.0	500.0	0.0
Repayments of revolving credit facility	(650.0)	(500.0)	0.0
Financing costs	(1.7)	(24.2)	0.0
Repurchases of common stock	(315.6)	(382.4)	(382.1)
Dividends paid	(112.5)	(112.4)	(102.9)
Proceeds from exercise of stock options	85.9	21.3	37.0
Withholding tax paid related to stock-based compensation	(8.5)	(8.3)	(10.4)
Other financing activities, net	(2.1)	(0.9)	(2.8)
Net cash provided by (used in) financing activities	488.1	(24.7)	(461.2)
Effect of foreign currency exchange rate changes on cash and cash equivalents	(1.2)	1.6	0.6
Change in cash and cash equivalents	(577.8)	551.0	(452.4)
Less: change in cash and cash equivalents of discontinued operations	(5.1)	(3.6)	1.3
Cash and cash equivalents
Cash and cash equivalents at beginning of period	897.1	342.5	796.2
Cash and cash equivalents at end of period	$ 324.4	$ 897.1	$ 342.5