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Description of Business and Principles of Consolidation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 19, 2021 | May 20, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Date of incorporation |  |  |  | Jul. 18, 2011 |
Entity incorporation state or country code |  |  |  | DE |
Common stock shares authorized |  |  | 1,700,000,000 | 429,600,000 |
Common stock shares issued |  |  | 373,641,135 | 226,364,401 |
Common stock shares outstanding |  |  | 373,641,135 | 226,364,401 |
Stockholders equity note stock split |  | 3-for-1 |  |  |
Conversion Of Stock Shares Issued For Each Share Converted |  |  | 1 | 1 |
Maximum [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Conversion Of Stock Conversion Period |  |  | 180 days |  |
Minimum [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Conversion Of Stock Conversion Period |  |  | 61 days |  |
KKR Denali Holdings L P [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Repayment of revolving credit facility | $ 400.0 |  |  |  |
Restated Certificate of Incorporation |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Common stock shares authorized |  | 429,600,000 |  |  |
Common Class A [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Common stock shares authorized |  |  | 1,500,000,000 | 386,400,000 | 360,000,000
Common stock shares issued |  |  | 225,833,513 | 183,800,251 | 177,593,772
Common stock shares outstanding |  |  | 225,833,513 | 183,800,251 | 177,593,772
Class Of Warrant Or Right Number Of Votes For Each Warrant Or Right |  |  | 1 |  |
Common Class A [Member] | Restated Certificate of Incorporation |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Common stock shares authorized | 1,500,000,000 | 386,400,000 |  |  |
Common Class A [Member] | Conversion Of Class A Common Stock Into Class B Common Stock [Member] | Adam Foroughi [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Common Stock Shares Converted From One Class To Another | 150,307,622 |  |  |  |
Common Class B [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Common stock shares authorized |  |  | 200,000,000 | 0 |
Common stock shares issued |  |  | 147,807,622 | 0 |
Common stock shares outstanding |  |  | 147,807,622 | 0 |
Class Of Warrant Or Right Number Of Votes For Each Warrant Or Right |  |  | 20 |  |
Common Class B [Member] | Restated Certificate of Incorporation |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Common stock shares authorized | 200,000,000 |  |  |  |
Common Class C [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Common stock shares issued |  |  | 0 | 0 |
Common stock shares outstanding |  |  | 0 | 0 |
Common Class C [Member] | Restated Certificate of Incorporation |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Common stock shares authorized | 150,000,000 |  |  |  |
Preferred Stock [Member] | Restated Certificate of Incorporation |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Preferred stock shares authorized | 100,000,000 |  |  |  |
IPO [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Common stock shares issued during the period shares | 22,500,000 |  |  |  |
Sale of stock issue price per share | $ 80.00 |  |  |  |
Sale of stock net consideration received on the transaction | $ 1,750.0 |  |  |  |
Underwriting discounts and commissions | 47.2 |  |  |  |
Offering expenses | $ 7.9 |  |  |  |

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