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Revenue Recognition (Tables) | 3 Months Ended
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Dec. 31, 2018
Revenue Recognition |
Schedule of revenues disaggregated by revenue sources |
|  | Three months ended
|  | December 31, |  | December 31,
|  | 2018 |  | 2017
|  | (in millions)
Cost reimbursable |  | $ | 2,571.6 |  | $ | 2,357.2
Guaranteed maximum price |  |  | 1,024.0 |  |  | 1,178.6
Fixed price |  |  | 1,441.9 |  |  | 1,375.0
Total revenue |  | $ | 5,037.5 |  | $ | 4,910.8
|  | Three months ended
|  | December 31, |  | December 31,
|  | 2018 |  | 2017
|  | (in millions)
Americas |  | $ | 4,070.4 |  | $ | 3,928.6
Europe, Middle East, Africa |  |  | 550.1 |  |  | 589.3
Asia Pacific |  |  | 417.0 |  |  | 392.9
Total revenue |  | $ | 5,037.5 |  | $ | 4,910.8
Schedule of net accounts receivable |
|  | December 31, |  | September 30,
|  | 2018 |  | 2018
|  | (in millions)
Billed |  | $ | 2,680.0 |  | $ | 2,697.7
Contract retentions |  |  | 654.1 |  |  | 661.7
Total accounts receivable—gross |  |  | 3,334.1 |  |  | 3,359.4
Allowance for doubtful accounts |  |  | (52.0) |  |  | (51.6)
Total accounts receivable—net |  | $ | 3,282.1 |  | $ | 3,307.8

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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