Accounts Receivable

12 Months Ended

Sep. 30, 2019

Receivables [Abstract]

Accounts Receivable

5. Accounts Receivable

Accounts receivable of $333.7 and $317.1, is net of an allowance for doubtful accounts of $5.0 and $5.6 and includes amounts of retention on incomplete projects to be completed within one year of $43.2 and $40.2 at September 30, 2019 and September 30, 2018,respectively.