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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flow from operating activities      
Net income $ 453.6 $ 553.2 $ 335.8
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 170.0 157.1 151.4
Stock-based compensation 338.0 330.7 287.1
Net (gain) loss on real estate assets (155.2) 175.2 17.7
Amortization of debt issuance costs 4.2 4.2 3.8
Net gains on equity investments 0.0 (5.0) 0.0
Amortization of deferred commissions 38.6 39.5 32.3
Non-cash operating lease expense 43.5 63.8 76.3
Deferred taxes 38.4 (396.3) (37.5)
Other (0.6) (0.8) (4.4)
Changes in operating assets and liabilities:      
Trade and other receivables, net (14.5) (5.5) (6.2)
Prepaid expenses and other current assets (41.1) (50.0) (58.4)
Other assets 23.3 (9.7) 11.7
Accounts payable 1.2 13.0 7.6
Accrued and other current liabilities (20.8) 4.7 (28.6)
Accrued compensation and benefits (22.6) (6.8) 23.5
Deferred revenue 21.6 25.6 59.8
Other non-current liabilities (1.5) (17.9) (13.1)
Operating lease liabilities (65.4) (86.4) (102.1)
Tenant improvement allowance reimbursement 1.1 8.7 5.1
Cash paid for lease termination (28.1) 0.0 (32.0)
Net cash provided by operating activities 783.7 797.3 729.8
Cash flow from investing activities      
Capital expenditures (24.3) (33.8) (22.1)
Purchase of intangible assets (0.3) (1.1) (6.8)
Business combinations, net of cash acquired 0.0 (75.4) (140.0)
Purchases of short-term investments (208.7) (571.2) (1,138.4)
Proceeds from sales of short-term investments 352.4 213.7 293.6
Proceeds from maturities of short-term investments 252.2 389.1 448.7
Proceeds from sales of equity investments 0.0 10.6 0.0
Other 23.9 19.6 40.2
Net cash provided by (used in) investing activities 395.2 (48.5) (524.8)
Cash flow from financing activities      
Proceeds from issuance of convertible senior notes 0.0 0.0 1,389.1
Purchases of convertible note hedge in connection with issuance of convertible senior notes 0.0 0.0 (265.3)
Proceeds from sale of warrants in connection with issuance of convertible senior notes 0.0 0.0 202.9
Payments of debt issuance costs (0.1) 0.0 (23.7)
Payments for taxes related to net share settlement of restricted stock units and awards (135.1) (119.4) (124.8)
Proceeds from issuance of common stock, net of taxes withheld 2.5 0.5 6.9
Principal payments on finance lease obligations (126.6) (127.5) (110.4)
Common stock repurchases (539.9) (795.4) (1,058.5)
Net cash (used in) provided by financing activities (799.2) (1,041.8) 16.2
Effect of exchange rate changes on cash and cash equivalents 2.4 (7.2) (3.1)
Change in cash and cash equivalents 382.1 (300.2) 218.1
Cash and cash equivalents - beginning of period 232.8 533.0 314.9
Cash and cash equivalents - end of period 614.9 232.8 533.0
Supplemental cash flow data:      
Interest 10.5 8.2 8.5
Income taxes 68.2 27.6 4.2
Non-cash investing and financing activities:      
Property and equipment received and accrued in accounts payable and accrued liabilities 2.0 2.6 5.6
Property and equipment acquired under finance leases $ 144.7 $ 105.8 $ 127.3