Share-Based Compensation - Schedule of stock-based compensation costs (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Compensation Related Costs [Abstract] | ||
| Share-based compensation costs | $ 2.3 | $ 1.9 |
| Less impact of income tax benefit | 0.5 | 0.4 |
| Share-based compensation costs, net of tax | $ 1.8 | $ 1.5 |
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount, after tax, of expense for award under share-based payment arrangement. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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