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Income Taxes - (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
U.S. federal statutory tax rate (as a percent) |  |  |  |  |  | 21.00% | 35.00%
Effective income tax rate (as a percent) | 26.00% | 18.10% |  | 24.20% | 210.00% |  |
Effective income tax rate excluding certain discrete tax items (as a percent) | 28.60% | 28.20% |  | 28.40% | 28.20% |  |
Tax Cuts and Jobs Act of 2017, provisional net charge |  |  | $ 56.0 |  |  |  |
ASU 2016-09 |  |  |  |  |  |  |
Excess tax benefits from employee stock compensation benefit | $ 0.7 |  |  | $ 2.6 |  |  |

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