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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Taxes - Additional Information [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  | 28.10%
Provisional tax expense (benefit) for the deemed repatriation of undistributed foreign earnings, Increase (decrease) | $ (3.9) |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  | $ 78.0 |  |
Change in Permanent Reinvestment Assertion | $ 6.1 |  |  |  |
Income Tax (Textual) [Abstract] |  |  |  |  |
Effective tax rate | 24.80% | 29.30% | 24.90% |  |
Scenario, Forecast [Member] |  |  |  |  |
Income Taxes - Additional Information [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 21.00% |

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