Accounts Receivable

12 Months Ended

Sep. 30, 2020

Receivables [Abstract]

Accounts Receivable

5. Accounts Receivable

Accounts receivable of $319.2 and $333.7, is net of an allowance for doubtful accounts of $2.8 and $5.0 and includes amounts of retention on incomplete projects to be completed within one year of $45.9 and $43.2 at September 30, 2020 and September 30, 2019, respectively.