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Fair Value Measurements (Tables)
6 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
September 30, 2021
TotalLevel 1Level 2
Derivative liabilities$5.8 $— $5.8 
NCI$2,997.3 $2,997.3 $—