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Fair Value Measurements (Tables)
6 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
March 31, 2020
TotalLevel 1Level 2
Derivative liabilities$10.6  $—  $10.6  
NCI$1,661.9  $1,661.9  $—