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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Cash flow from operating activities      
Net loss $ (7.7) $ (465.5)  
Adjustments to reconcile net loss to net cash provided by operating activities:      
Depreciation and amortization 45.8 35.9  
Stock-based compensation 55.6 486.5  
Amortization of deferred commissions 3.9 2.4  
Other (4.4) (0.6)  
Changes in operating assets and liabilities:      
Trade and other receivables, net (5.1) 3.6  
Prepaid expenses and other current assets (14.2) (1.5)  
Other assets 11.2 (5.7)  
Accounts payable (5.2) (2.8)  
Accrued and other current liabilities 10.0 8.8  
Accrued compensation and benefits (45.9) (26.2)  
Deferred revenue 18.6 26.7  
Other non-current liabilities (13.2) 0.2  
Tenant improvement allowance reimbursement 13.8 0.0  
Net cash provided by operating activities 63.2 61.8  
Cash flow from investing activities      
Capital expenditures (29.7) (9.9)  
Cash paid for business combinations, net of cash acquired (172.1) 0.0  
Purchases of short-term investments (153.0) (180.8)  
Proceeds from sales of short-term investments 110.2 0.0  
Proceeds from maturities of short-term investments 66.6 0.0  
Other 4.7 (2.4)  
Net cash used in investing activities (173.3) (193.1)  
Cash flow from financing activities      
Proceeds from initial public offering and private placement, net of underwriters' discounts and commissions 0.0 638.2 $ 746.6
Payments of deferred offering costs 0.0 (0.9)  
Shares repurchased for tax withholdings on release of restricted stock (25.5) (241.2)  
Proceeds from issuance of common stock, net of repurchases 0.9 0.8  
Principal payments on finance lease obligations (26.2)    
Principal payments on finance lease obligations   (29.8)  
Other (0.2) (2.1)  
Net cash (used in) provided by financing activities (51.0) 365.0  
Effect of exchange rate changes on cash and cash equivalents 1.0 1.6  
Change in cash and cash equivalents (160.1) 235.3  
Cash and cash equivalents—beginning of period 519.3 430.0 430.0
Cash and cash equivalents—end of period 359.2 665.3 $ 519.3
Supplemental cash flow data:      
Property and equipment acquired under finance leases $ 39.9    
Property and equipment acquired under finance leases   $ 25.5