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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Restrictions on Cash and Cash Equivalents | The following table provides a reconciliation of the total cash, cash equivalents and restricted cash reported on the Condensed Consolidated Balance Sheets to the corresponding amounts reported on the Condensed Consolidated Statements of Cash Flows:
|  | Cash, Cash Equivalents and Restricted Cash
|  | December 31, 2018 |  | December 31, 2017 |  | September 30, 2018 |  | September 30, 2017
Cash and cash equivalents |  | $ | 477.6 |  |  | $ | 446.4 |  |  | $ | 452.6 |  |  | $ | 558.4 |
Restricted cash |  | 17.4 |  |  | 19.8 |  |  | 9.6 |  |  | 10.3 |
Cash, cash equivalents and restricted cash |  | $ | 495.0 |  |  | $ | 466.2 |  |  | $ | 462.2 |  |  | $ | 568.7 |
Schedule of Cash and Cash Equivalents | The following table provides a reconciliation of the total cash, cash equivalents and restricted cash reported on the Condensed Consolidated Balance Sheets to the corresponding amounts reported on the Condensed Consolidated Statements of Cash Flows:
|  | Cash, Cash Equivalents and Restricted Cash
|  | December 31, 2018 |  | December 31, 2017 |  | September 30, 2018 |  | September 30, 2017
Cash and cash equivalents |  | $ | 477.6 |  |  | $ | 446.4 |  |  | $ | 452.6 |  |  | $ | 558.4 |
Restricted cash |  | 17.4 |  |  | 19.8 |  |  | 9.6 |  |  | 10.3 |
Cash, cash equivalents and restricted cash |  | $ | 495.0 |  |  | $ | 466.2 |  |  | $ | 462.2 |  |  | $ | 568.7 |
Shares Used in Computing Basic and Diluted Earnings Per Share | Shares used in computing basic and diluted earnings per share are as follows:
|  | Three Months Ended December 31,
|  | 2018 |  | 2017
Denominator (thousands of shares): |  |  |  |
Weighted-average common shares outstanding — basic |  | 174,413 |  |  | 173,670 |
Incremental shares issuable for stock options and awards (a) |  | 3,153 |  |  | 3,278 |
Weighted-average common shares outstanding — diluted |  | 177,566 |  |  | 176,948 |
(a) | For the three months ended December 31, 2018 and 2017, there were 30 and 146 shares, respectively, associated with outstanding stock option awards that were excluded from the computation of diluted earnings per share above because their effect was antidilutive.

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- Definition Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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