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Fair Value Measurements (Tables)
6 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
March 31, 2021September 30, 2020
TotalLevel 1Level 2TotalLevel 1Level 2
Derivative liabilities$7.9 $— $7.9 $10.4 $— $10.4 
NCI$2,301.4 $2,301.4 $— $2,021.6 $2,021.6 $—