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Income Taxes - (Details) - USD ($) $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018
U.S. Federal income tax rate (as a percent) | 21.00% | 35.00% |  |
Effective income tax rate (as a percent) |  |  | (2.90%) | 13.90%
Effective income tax rate excluding certain discrete tax items (as a percent) |  |  | 27.90% | 28.10%
ASU 2016-09 |  |  |  |
Excess tax benefits from employee stock compensation benefit |  |  | $ 6.2 | $ 1.5

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