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Share-based Payments (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020
Stock options, Weighted average exercise price |  |  |
Vesting period | 3 years |  |
Recognized compensation expense | $ 15.4 | $ 21.3 |
Unrecognized compensation expense | $ 68.0 |  | $ 50.0
Employee Stock Option |  |  |
Shares of stock under options |  |  |
Balance at the beginning of the period (in shares) | 0.4 | 0.1 |
Granted (in shares) | 0.0 |  |
Options exercised (in shares) | 0.0 |  |
Options forfeited or expired ( in shares) | 0.0 |  |
Balance at the end of the period (in shares) | 0.4 | 0.1 |
Vested and expected to vest in the future at the end of the period (in shares) | 0.1 | 0.1 |
Stock options, Weighted average exercise price |  |  |
Balance at the beginning of the period (in dollars per share) | $ 36.41 | $ 31.62 |
Granted (in dollars per share) | 0 |  |
Options exercised (in dollars per share) | 0 |  |
Cancelled (in dollars per share) | 0 |  |
Balance at the end of the period (in dollars per share) | 36.41 | 31.62 |
Vested and expected to vest in the future at the end of the period (in dollars per share) | $ 31.62 | 31.62 |
Performance Earnings Program |  |  |
Stock options, Weighted average exercise price |  |  |
Vesting period | 3 years |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 52.50 | 43.06 |
Restricted Stock Units |  |  |
Stock options, Weighted average exercise price |  |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 47.87 | $ 43.06 |

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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