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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]      
Maximum undiscounted future payment obligation $ 425.6    
AHGP as the parent company      
Condensed Financial Statements, Captions [Line Items]      
Cash contribution by affiliated entity $ 196.3 $ 52.2 $ 51.8