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Share-based Payments (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019
Stock options, Weighted Average Exercise Price |  |  |
Vesting period | 3 years |  | 3 years
Recognized compensation expense | $ 21.3 | $ 15.6 |
Unrecognized compensation expense | $ 80.8 |  | $ 74.6
Employee Stock Option |  |  |
Shares of stock under options |  |  |
Balance at the beginning of the period (in shares) | 0.1 | 0.6 | 0.6
Balance at the end of the period (in shares) | 0.1 | 0.6 | 0.1
Vested and expected to vest in the future at the end of the period (in shares) | 0.1 | 0.6 |
Stock options, Weighted Average Exercise Price |  |  |
Balance at the beginning of the period (in dollars per share) | $ 31.62 | $ 31.62 | $ 31.62
Balance at the end of the period (in dollars per share) | 31.62 | 31.62 | $ 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) | $ 43.06 | 27.50 |
Restricted Stock Units (RSUs) |  |  |
Stock options, Weighted Average Exercise Price |  |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 43.06 | $ 27.50 |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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