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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Allowance for doubtful accounts | $ 5.3 | $ 2.5
Contract assets allowance for doubtful accounts current |  | 2.9
Contract assets allowance for doubtful accounts noncurrent |  | $ 1.7
Redeemable preferred units, par value per share |  | $ 100,000
Redeemable preferred units, shares authorized |  | 430
Redeemable preferred units, shares issued |  | 430
Redeemable preferred units, shares outstanding |  | 430
Preferred stock, par value | $ 0.0001 | $ 0.0001
Preferred stock, authorized | 20,000,000 | 20,000,000
Preferred stock, issued | 0 |
Preferred stock, outstanding | 0 |
Class A Common Units |  |
Common unit, par value |  | $ 0
Common unit, authorized |  | 100,000
Common unit, issued |  | 100,000
Common unit, outstanding |  | 100,000
Class B Common Units |  |
Common unit, par value |  | $ 323
Common unit, authorized |  | 1,010
Common unit, issued |  | 1,010
Common unit, outstanding |  | 1,010
Class A Common Stock |  |
Common stock, par value | $ 0.0001 | $ 0.0001
Common stock, authorized | 300,000,000 | 300,000,000
Common stock, issued | 18,693,653 |
Common stock, outstanding | 18,693,653 |
Class B Common Stock |  |
Common stock, par value | $ 0.0001 | $ 0.0001
Common stock, authorized | 100,000,000 | 100,000,000
Common stock, issued | 39,204,989 |
Common stock, outstanding | 39,204,989 |
Class C Common Stock |  |
Common stock, par value | $ 0.0001 | $ 0.0001
Common stock, authorized | 100,000,000 | 100,000,000
Common stock, issued | 20,139,163 |
Common stock, outstanding | 20,139,163 |

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