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CONDENSED STATEMENTS OF CASH FLOWS (Parent Company) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |  |  |  |
Net loss | $ (36.5) | $ (21.6) | $ (88.4) | $ (75.8) | $ (108.5) | $ (52.9)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |
Depreciation |  |  | 1.1 | 0.3 | 0.6 | 0.1
Stock-based compensation |  |  | 7.3 | 2.3 | 4.3 | 2.1
Change in fair value of warrant liability |  |  |  |  | 0.0 | 0.2
Change in assets and liabilities |  |  |  |  |  |
Other assets |  |  | (11.4) | (4.1) | (1.1) | (0.4)
Trade payables |  |  | 0.3 | (0.8) | (0.8) | 0.2
Net cash used in operating activities |  |  | (71.0) | (60.4) | (78.1) | (40.8)
Cash flows from investing activities: |  |  |  |  |  |
Purchases of property and equipment |  |  | (3.1) | (3.0) | (2.7) | (0.7)
Purchases of intangible assets |  |  |  |  | (0.6) | 0.0
Net cash provided by (used in) investing activities |  |  | 36.3 | (38.7) | (54.0) | 6.4
Cash flows from financing activities: |  |  |  |  |  |
Issuance of preferred stock, net |  |  |  | 299.4 | 299.4 | 119.8
Proceeds from stock exercises |  |  | 0.3 | 0.5 | 0.7 | 0.1
Net cash provided by financing activities |  |  | 339.6 | 299.9 | 300.1 | 119.9
Net increase in cash, cash equivalents and restricted cash |  |  | 305.4 | 200.8 | 167.9 | 85.5
Cash, cash equivalents and restricted cash at beginning of period | 270.3 | 102.4 | 270.3 | 102.4 | 102.4 | 16.9
Cash, cash equivalents and restricted cash at end of period |  |  | 575.7 | 303.2 | 270.3 | 102.4
Parent Company |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |
Net loss |  |  |  |  | (108.5) | (53.0)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |
Depreciation |  |  |  |  | 0.3 | 0.1
Stock-based compensation |  |  |  |  | 2.3 | 0.7
Change in fair value of warrant liability |  |  |  |  | 0.0 | 0.2
Equity in undistributed earnings of subsidiaries |  |  |  |  | 90.7 | 46.4
Change in assets and liabilities |  |  |  |  |  |
Intercompany receivable |  |  |  |  | (11.8) | (0.7)
Other assets |  |  |  |  | (0.5) | (0.7)
Trade payables |  |  |  |  | (1.1) | (0.7)
Intercompany payable |  |  |  |  | 6.6 | (0.3)
Other liabilities |  |  |  |  | 4.9 | 5.8
Net cash used in operating activities |  |  |  |  | (17.1) | (2.2)
Cash flows from investing activities: |  |  |  |  |  |
Investments in subsidiaries |  |  |  |  | (117.2) | (55.4)
Purchases of property and equipment |  |  |  |  | (1.7) | (0.5)
Purchases of intangible assets |  |  |  |  | (0.6) | 0.0
Net cash provided by (used in) investing activities |  |  |  |  | (119.5) | (55.9)
Cash flows from financing activities: |  |  |  |  |  |
Issuance of preferred stock, net |  |  |  |  | 299.4 | 119.8
Proceeds from stock exercises |  |  |  |  | 0.5 | 0.1
Net cash provided by financing activities |  |  |  |  | 299.9 | 119.9
Net increase in cash, cash equivalents and restricted cash |  |  |  |  | 163.3 | 61.8
Cash, cash equivalents and restricted cash at beginning of period | $ 239.7 | $ 76.4 | $ 239.7 | $ 76.4 | 76.4 | 14.6
Cash, cash equivalents and restricted cash at end of period |  |  |  |  | $ 239.7 | $ 76.4

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