Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net income	$ 61.8	$ 79.4
Reconciliation of net income to net cash provided by operating activities:
Depreciation	24.6	21.3
Amortization	32.2	27.8
Lease expense	7.4	6.4
Stock-based compensation	12.7	6.8
Loss on extinguishment of debt	8.8	0.0
Deferred taxes	(2.3)	(0.5)
Other operating activities, net	6.0	8.1
Changes in assets and liabilities, excluding effects of acquisitions:
Receivables	(8.3)	(49.7)
Inventories	(64.9)	(18.6)
Contract assets	(3.3)	(13.4)
Prepaid expenses and other assets	32.5	19.6
Accounts payable	6.9	53.4
Accrued and other current liabilities	(58.9)	(31.0)
Contract liabilities	6.9	2.8
Other long-term liabilities	(8.9)	(2.6)
Net cash provided by operating activities	53.2	109.8
Investing activities:
Acquisitions, net of cash acquired	(2.4)	(202.0)
Capital expenditures	(22.8)	(23.3)
Other investing activities, net	0.9	0.9
Net cash used in investing activities	(24.3)	(224.4)
Financing activities:
Proceeds from notes	740.7	0.0
Repayment of notes	(258.5)	0.0
Borrowings from revolving credit facility	500.0	0.0
Repurchases of common stock	(120.6)	(157.1)
Dividends paid	(28.3)	(23.3)
Financing costs	(24.2)	0.0
Proceeds from exercise of stock options	10.5	10.6
Withholding tax paid related to stock-based compensation	(6.4)	(3.3)
Other financing activities, net	(0.2)	0.0
Net cash used in financing activities	813.0	(173.1)
Effect of foreign currency exchange rate changes on cash and cash equivalents	(5.4)	0.7
Change in cash and cash equivalents	836.5	(287.0)
Cash and cash equivalents at beginning of period	351.2	803.6
Cash and cash equivalents at end of period	$ 1,187.7	$ 516.6