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Fair Value Measurements (Tables)
9 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
June 30, 2021September 30, 2020
TotalLevel 1Level 2TotalLevel 1Level 2
Derivative liabilities$6.8 $— $6.8 $10.4 $— $10.4 
NCI$3,054.9 $3,054.9 $— $2,021.6 $2,021.6 $—