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Fair Value Measurements (Tables)
3 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
December 31, 2020September 30, 2020
TotalLevel 1Level 2TotalLevel 1Level 2
Derivative liabilities$9.2 $— $9.2 $10.4 $— $10.4 
NCI$2,369.6 $2,369.6 $— $2,021.6 $2,021.6 $—