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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items] |  |  |
Maximum undiscounted future payment obligation | $ 146.7 |  |
AHGP as the parent company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Cash contribution by affiliated entity | $ 52.2 | $ 51.8 | $ 278.4

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