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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flow from operating activities      
Net loss $ (484.9) $ (111.7) $ (210.2)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Depreciation and amortization 166.8 181.8 191.6
Stock-based compensation 650.1 164.6 147.6
Amortization of deferred commissions 12.1 6.6 3.7
Donation of common stock to charitable foundation 0.0 9.4 0.0
Other (1.9) (1.7) 1.1
Changes in operating assets and liabilities:      
Trade and other receivables, net 0.1 (14.4) 1.0
Prepaid expenses and other current assets (47.9) (18.2) 0.0
Other assets (11.2) (10.6) (7.8)
Accounts payable (1.7) 16.2 5.5
Accrued and other current liabilities 40.3 34.0 (12.4)
Accrued compensation and benefits 25.0 14.4 35.6
Deferred revenue 66.4 64.3 87.6
Non-current liabilities 12.2 (4.4) 9.3
Net cash provided by operating activities 425.4 330.3 252.6
Cash flow from investing activities      
Capital expenditures (63.0) (25.3) (115.2)
Purchase of intangible assets (3.0) (0.8) (8.5)
Purchases of short-term investments (850.4)    
Proceeds from maturities of short-term investments 212.4 0.0 0.0
Proceeds from sales of short-term investments 71.2 0.0 0.0
Other (1.0) 2.2 5.7
Net cash used in investing activities (633.8) (23.9) (118.0)
Cash flow from financing activities      
Proceeds from initial public offering and private placement, net of underwriters' discounts and commissions 746.6 0.0 0.0
Payments of deferred offering costs (4.5) (2.5) 0.0
Shares repurchased for tax withholdings on release of restricted stock (351.9) (87.9) 0.0
Proceeds from issuance of common stock, net of repurchases 26.2 0.5 0.0
Principal payments on capital lease obligations (109.1) (133.0) [1] (137.9) [1]
Principal payments against note payable (3.5) (3.9) (3.8)
Proceeds from sale-leaseback agreement 0.0 0.0 8.8
Fees paid for revolving credit facility (0.4) (2.6) 0.0
Other (2.6) (2.3) (1.6)
Net cash provided by (used in) financing activities 300.8 (231.7) (134.5)
Effect of exchange rate changes on cash and cash equivalents (3.1) 2.6 (4.3)
Change in cash and cash equivalents 89.3 77.3 (4.2)
Cash and cash equivalents—beginning of period 430.0 352.7 356.9
Cash and cash equivalents—end of period 519.3 430.0 352.7
Supplemental cash flow data:      
Interest 8.3 10.8 14.9
Income taxes 1.4 3.4 1.5
Non-cash investing and financing activities:      
Property and equipment received and accrued in accounts payable and accrued liabilities 7.3 2.4 7.6
Property and equipment acquired under capital leases 98.5 44.9 92.2
Fair value of shares issued related to acquisitions of businesses and other assets 0.0 0.0 0.7
Deferred offering costs accrued in accounts payable and accrued liabilities $ 0.0 $ 1.6 $ 0.0
[1] Includes amounts attributable to related party transactions. See Note 14, "Related Party Transactions" for further details.