CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Operating activities:
Net Income (Loss) Attributable to Parent	$ 296.9	$ 82.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	92.2	96.4
Stock-based compensation expense	291.5	257.4
Deferred income taxes	13.0	47.9
Restructuring and other exit costs, net	0.0	0.5
Other	48.6	10.8
Changes in operating assets and liabilities
Accounts receivable	112.8	(47.2)
Prepaid expenses and other assets	(61.6)	37.6
Accounts payable and other liabilities	42.3	(94.2)
Deferred revenue	(78.3)	328.8
Accrued income taxes	22.2	(3.8)
Net cash provided by operating activities	779.6	716.9
Investing activities:
Purchases of marketable securities	(21.0)	(19.9)
Sales of marketable securities	0.0	22.4
Maturities of marketable securities	17.0	5.0
Capital expenditures	(67.6)	(39.2)
Purchases of developed technologies	(4.8)	0.0
Acquisitions, net of cash acquired	(44.8)	0.0
Other investing activities	(55.5)	(11.0)
Net cash used in investing activities	(176.7)	(42.7)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs	112.9	91.8
Taxes paid related to net share settlement of equity awards	(105.0)	(79.9)
Repurchases of common stock	(399.4)	(261.9)
Repayment of debt	(450.0)	(350.0)
Other financing activities	(2.5)	0.0
Net cash used in financing activities	(844.0)	(600.0)
Effect of exchange rate changes on cash and cash equivalents	3.4	(4.0)
Net (decrease) increase in cash and cash equivalents	(237.7)	70.2
Cash and cash equivalents at beginning of period	1,774.7	886.0
Cash and cash equivalents at end of period	1,537.0	956.2
Non-cash financing activities:
Fair value of common stock issued to settle liability-classified restricted stock units	$ 28.7	$ 0.0